Fixing Kyocera ECOSYS FSC8600DN Printer Error Codes in details

Fixing Kyocera ECOSYS FSC8600DN Printer Error Codes in details

– Printer model: Kyocera ECOSYS FSC8600DN
– Fix Error codes on Kyocera ECOSYS FSC8600DN model and its description:

• Code: 0100
• Description: Backup memory device error
• Causes: Defective EEPROM. Defective main PWB.
• Remedy: Defective EEPROM. Replace the main PWB and check for correct operation.
  Defective main PWB. Replace the main PWB and check for correct operation.

• Code: 0120
• Description: MAC address data error
  For data in which the MAC address is invalid.
• Causes: Defective EEPROM. Defective engine PWB.
• Remedy: Defective EEPROM. Replace the main PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 0150
• Description: Backup memory read/write error (engine PWB)
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated 5 times successively. Mismatch of reading data from 2 locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Improper installation EEPROM. Defective engine PWB. Device damage of EEPROM.
• Remedy: Improper installation EEPROM. Check the installation of the EEPROM and remedy if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.
  Device damage of EEPROM. Contact the Service Administrative Division.

• Code: 0160
• Description: Backup memory data error (engine PWB)
  Reading data from EEPROM is abnormal.
• Causes: Data damage of EEPROM.
• Remedy: Data damage of EEPROM. Contact the Service Administrative Division.

• Code: 0170
• Description: Billing counting error
  A checksum error is detected in the main and engine backup memories for the billing counters.
• Causes: Data damage of EEPROM. Defective PWB.
• Remedy: Data damage of EEPROM. Contact the Service Administrative Division.
  Defective PWB. Replace the DF main PWB or the engine PWB and check for correct operation.

• Code: 0180
• Description: Machine number mismatch
  Machine number of main and engine does not match.
• Causes: Data damage of EEPROM.
• Remedy: Data damage of EEPROM. Contact the Service Administrative Division.

• Code: 0640
• Description: Hard disk error
  The hard disk cannot be accessed.
• Causes: Defective connector cable or poor contact in the connector. Defective hard disk. Defective main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable.
  Defective hard disk. Run U024 (HDD formatting) without turning the power off to initialize the hard disk. Replace the hard disk drive and check for correct operation if the problem is still detected after initialization.
  Defective main PWB. Replace the main PWB and check for correct operation.

• Code: 0800
• Description: Image processing error
  JAM010X is detected twice.
• Causes: Defective main PWB.
• Remedy: Defective main PWB. Replace the main PWB and check for correct operation.

• Code: 0840
• Description: Faults of RTC
  The time is judged to go back based on the comparison of the RTC time and the current time or five years or more have passed.
• Causes: The battery is disconnected from the main PWB. Defective main PWB.nnec
• Remedy: The battery is disconnected from the main PWB. Check visually and remedy if necessary
  Defective main PWB. Replace the main PWB and check for correct operation.
  * : Once detected, turning the main power switch off and on lets the machine in disconnection mode, displaying Maintenance T.Execute U906 to reset.

• Code: 0970
• Description: 12 V power down detect
  Power is disconnected during sleepingDetection of the temporary blackout during sleeping (24V is off, 23V is on, only the controller software is running).
• Causes: Defective power source PWB.
• Remedy: Defective power source PWB. Replace the power source PWB and check for correct operation.

• Code: 0980
• Description: 24 V power down detect
  24V disconnection signal is detected for 1 s and 12V disconnection signal is not detected.
• Causes: Defective power source PWB.
• Remedy: Defective power source PWB. Replace the power source PWB and check for correct operation.

• Code: 1000
• Description: MP lift motor error
  After the MP lift motor is driven, the ON status of MP lift sensors 1 and 2 cannot be detected for 3 s.
• Causes: Defective MP plate elevation mechanism. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective MP lift motor. Defective engine PWB.
• Remedy: Defective MP plate elevation mechanism. Check to see if the MP plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. MP lift motor and relay PWB (YC3) Relay PWB (YC12) and feed PWB 1 (YC17) Feed PWB 1 (YC1) and engine PWB (YC6)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective MP lift motor. Replace the MP lift motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 1010
• Description: Lift motor 1 error
  After cassette 1 is inserted, lift sensor 1 does not turn on within 12 s. This error is detected 5 times successively. The lock signal of the motor is detected continuously for 1 s. This error is detected 5 times successively.
• Causes: Defective bottom plate elevation mechanism in the cassette. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective lift motor 1. Defective engine PWB.
• Remedy: Defective bottom plate elevation mechanism in the cassette. Check to see if the bottom plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Lift motor 1 and feed PWB 2 (YC3) Feed PWB 2 (YC1) and engine PWB (YC4)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective lift motor 1. Replace the lift motor 1.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 1020
• Description: Lift motor 2 error
  After cassette 2 is inserted, lift sensor 2 does not turn on within 12 s. This error is detected 5 times successively. The lock signal of the motor is detected continuously for 1 s. This error is detected 5 times successively.
• Causes: Defective bottom plate elevation mechanism in the cassette. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective lift motor 2. Defective engine PWB.
• Remedy: Defective bottom plate elevation mechanism in the cassette. Check to see if the bottom plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Lift motor 2 and feed PWB 2 (YC3) Feed PWB 2 (YC1) and engine PWB (YC4)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective lift motor 2. Replace the lift motor 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 1030
• Description: PF lift motor 1 error (paper feeder)
  After cassette 3 is inserted, PF lift sensor 1 does not turn on within 12 s. This error is detected 5 times successively. During driving the motor, the lift overcurrent protective monitor signal is detected for 1 s or more 5 times successively. However, the first 1 s after motor is turned on is excluded from detection.
• Causes: Defective bottom plate elevation mechanism in the cassette. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF lift motor 1. Defective PF main PWB.
• Remedy: Defective bottom plate elevation mechanism in the cassette. Check to see if the bottom plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF lift motor 1 and PF main PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF lift motor 1. Replace the PF lift motor 1.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 1040
• Description: PF lift motor 2 error (paper feeder)
  After cassette 4 is inserted, PF lift sensor 2 does not turn on within 12 s. This error is detected 5 times successively. During driving the motor, the lift overcurrent protective monitor signal is detected for 1 s or more 5 times successively. However, the first 1 s after motor is turned on is excluded from detection.
• Causes: Defective bottom plate elevation mechanism in the cassette. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF lift motor 2. Defective PF main PWB.
• Remedy: Defective bottom plate elevation mechanism in the cassette. Check to see if the bottom plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF lift motor 2 and PF main PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF lift motor 2. Replace the PF lift motor 2.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder)

• Code: 1050
• Description: SM lift motor error (side multi tray)
  [45 ppm/55 ppm model] After cassette 5 is inserted, SM lift sensor does not turn on within 12 s. This error is detected 5 times successively. (Time to detect is 2 seconds at the second time and later.) During driving the motor, the lift overcurrent protective monitor signal is detected for 1 s or more 5 times successively. However, the first 1 s after motor is turned on is excluded from detection.
• Causes: Defective bottom plate elevation mechanism in the cassette. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective SM lift motor. Defective SM main PWB.
• Remedy: Defective bottom plate elevation mechanism in the cassette. Check to see if the bottom plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SM lift motor and SM main PWB (YC5)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective SM lift motor. Replace the SM lift motor.
  Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).

• Code: 1060
• Description: PF lift motor 1 error (side paper feeder)
  After cassette 6 is inserted, PF lift sensor 1 does not turn on within 12 s. This error is detected 5 times successively. (Time to detect is 2 seconds at the second time and later.) During driving the motor, the lift overcurrent protective monitor signal is detected for 1 s or more 5 times successively. However, the first 1 s after motor is turned on is excluded from detection. *:The software over-current protection monitor signal has been detected for 200ms or longer where LFC is installed
• Causes: Defective bottom plate elevation mechanism in the cassette. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF lift motor 1. Defective PF main PWB.
• Remedy: Defective bottom plate elevation mechanism in the cassette. Check to see if the bottom plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF lift motor 1 and PF main PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF lift motor 1. Replace the PF lift motor 1.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 1070
• Description: PF lift motor 2 error (side paper feeder)
  After cassette 7 is inserted, PF lift sensor 2 does not turn on within 12 s. This error is detected 5 times successively. (Time to detect is 2 seconds at the second time and later.) During driving the motor, the lift overcurrent protective monitor signal is detected for 1 s or more 5 times successively. However, the first 1 s after motor is turned on is excluded from detection. *:The software over-current protection monitor signal has been detected for 200ms or longer where LFC is installed
• Causes: Defective bottom plate elevation mechanism in the cassette. Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF lift motor 2. Defective PF main PWB.
• Remedy: Defective bottom plate elevation mechanism in the cassette. Check to see if the bottom plate can move smoothly and repair it if any problem is found.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF lift motor 2 and PF main PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF lift motor 2. Replace the PF lift motor 2.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 1100
• Description: PF lift motor 1 error (large capacity feeder)
  After cassette 3 is inserted, PF lift sensor 1 does not turn on within 23 s. This error is detected 5 times successively. (Time to detect is 2 seconds at the second time and later.) During driving the motor, the lift overcurrent protective monitor signal is detected for 200 ms or more 5 times successively. However, the first 1 s after PF lift motor 1 is turned on is excluded from detection.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF lift motor 1. Defective PF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF lift motor 1 and PF main PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF lift motor 1. Replace the PF lift motor 1.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 1110
• Description: PF lift motor 2 error (large capacity feeder)
  After cassette 4 is inserted, PF lift sensor 2 does not turn on within 23 s. This error is detected 5 times successively. (Time to detect is 2 seconds at the second time and later.) During driving the motor, the lift overcurrent protective monitor signal is detected for 200 ms or more 5 times successively. However, the first 1 s after PF lift motor 2 is turned on is excluded from detection
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF lift motor 2. Defective PF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF lift motor 2 and PF main PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF lift motor 2. Replace the PF lift motor 2.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 1140
• Description: SD lift motor error (side deck)
  After cassette 5 is inserted, SD lift sensor does not turn on within 30 s. The lock signal of the motor is detected continuously for 200 ms.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective SD lift motor. Defective SD main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SD lift motor and SD main PWB (YC8)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective SD lift motor. Replace the SD lift motor.
  Defective SD main PWB. Replace the SD main PWB (Refer to the service manual for the paper feeder).

• Code: 1250
• Description: SM multi feed sensor communication error (side multi tray)
  A communication error is detected 3 times in succession.
• Causes: Improper installation side multi tray. Defective connector cable or poor contact in the connector. Defective engine PWB. Defective SM main PWB.
• Remedy: Improper installation side multi tray. Follow installation instruction carefully again.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SM main PWB (YC1) and engine PWB (YC19)
  Defective engine PWB. Replace the engine PWB a1-5-49nd check for correct operation.
  Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).

• Code: 1350
• Description: SM multi feed sensor error (side multi tray)
  The SM multi feed sensor has detected multi feeding 5 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective SM multi feed sensor. Defective SM main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SM multi feed sensor and SM main PWB (YC11)
  Defective SM multi feed sensor. Replace the SM multi feed sensor.
  Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).

– Kyocera ECOSYS FSC8600DN printer Error Codes and quick guide to troubleshooting:

• Code: 1450
• Description: SM multi feed sensor backup error (side multi tray)
  When writing the data, read and write data does not match 3 times in succession. Deleting a block has failed three times in a row. Writing won’t complete in 200 ms after writing has commenced.
• Causes: Defective connector cable or poor contact in the connector. Defective SM multi feed sensor. Defective SM main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SM multi feed sensor and SM main PWB (YC11)
  Defective SM multi feed sensor. Replace the SM multi feed sensor.
  Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).

• Code: 1800
• Description: Paper feeder communication error
  A communication error from paper feeder is detected 10 times in succession.
• Causes: Improper installation paper feeder. Defective connector cable or poor contact in the connector. Defective engine PWB. Defective PF main PWB.
• Remedy: Improper installation paper feeder. Follow installation instruction carefully again.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF main PWB (YC13) and engine PWB (YC19)
  Defective engine PWB. Replace the engine PWB and check for correct operation.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 1810
• Description: Side multi tray communication error
  A communication error from paper feeder is detected 10 times in succession.
• Causes: Improper installation side multi tray. Defective connector cable or poor contact in the connector. Defective engine PWB. Defective SM main PWB.
• Remedy: Improper installation side multi tray. Follow installation instruction carefully again.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SM main PWB (YC1) and engine PWB (YC19)
  Defective engine PWB. Replace the engine PWB and check for correct operation.
  Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).

• Code: 1820
• Description: Side paper feeder communication error
  A communication error from paper feeder is detected 10 times in succession.
• Causes: Improper installation side paper feeder. Defective connector cable or poor contact in the connector. Defective engine PWB. Defective SM main PWB. Defective PF main PWB.
• Remedy: Improper installation side paper feeder. Follow installation instruction carefully again.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF main PWB (YC13) and SM main PWB (YC4) SM main PWB (YC1) and engine PWB (YC19)
  Defective engine PWB. Replace the engine PWB and check for correct operation.
  Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 1900
• Description: Paper feeder EEPROM error
  When writing the data, read and write data does not match 3 times in succession.
• Causes: Defective PF main PWB. Device damage of EEPROM.
• Remedy: Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).
  Device damage of EEPROM. Contact the Service Administrative Division.

• Code: 1910
• Description: Side multi tray EEPROM error
  When writing the data, read and write data does not match 3 times in succession.
• Causes: Defective SM main PWB. Device damage of EEPROM.
• Remedy: Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).
  Device damage of EEPROM. Contact the Service Administrative Division.

• Code: 1920
• Description: Side paper feeder EEPROM error
  When writing the data, read and write data does not match 3 times in succession.
• Causes: Defective PF main PWB. Device damage of EEPROM.
• Remedy: Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).
  Device damage of EEPROM. Contact the Service Administrative Division.

• Code: 1950
• Description: Transfer belt unit EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated 5 times successively. Mismatch of reading data from 2 locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective transfer belt unit.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer belt unit and engine PWB (YC3)
  Defective transfer belt unit. Replace the transfer belt unit and check for correct operation.

• Code: 2101
• Description: Developer motor K error
  After developer motor K is driven, the ready signal does not turn to L within 5 s. After developer motor K is stabilized, the ready signal is at the H level for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective developer motor K. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer motor K and motor control PWB (YC7) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective developer motor K. Replace the developer motor K.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2103
• Description: Developer motor MCY error
  After developer motor MCY is driven, the ready signal does not turn to L within 5 s. After developer motor MCY is stabilized, the ready signal is at the H level for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective developer motor MCY. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer motor MCY and motor control PWB (YC7) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective developer motor MCY. Replace the developer motor MCY.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2201
• Description: Drum motor K steady-state error
  After drum motor K is stabilized, the ready signal is at the H level for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor K. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor K and motor control PWB (YC5) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor K. Replace the drum motor K.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2202
• Description: Drum motor C steady-state error
  After drum motor C is stabilized, the ready signal is at the H level for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor C. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor C and motor control PWB (YC4) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor C. Replace the drum motor C.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2203
• Description: Drum motor M steady-state error
  After drum motor M is stabilized, the ready signal is at the H level for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor M. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor M and motor control PWB (YC5) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor M. Replace the drum motor M.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2204
• Description: Drum motor Y steady-state error
  After drum motor Y is stabilized, the ready signal is at the H level for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor Y. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor Y and motor control PWB (YC4) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor Y. Replace the drum motor Y.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2211
• Description: Drum motor K startup error
  Drum motor K is not stabilized within 5 s since the motor is activated.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor K. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor K and motor control PWB (YC5) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor K. Replace the drum motor K.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2212
• Description: Drum motor C startup error
  Drum motor C is not stabilized within 5 s since the motor is activated.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor C. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor C and motor control PWB (YC4) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor C. Replace the drum motor C.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2213
• Description: Drum motor M startup error
  Drum motor M is not stabilized within 5 s since the motor is activated.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor M. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor M and motor control PWB (YC5) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor M. Replace the drum motor M.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2214
• Description: Drum motor Y startup error
  Drum motor Y is not stabilized within 5 s since the motor is activated.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective drum motor Y. Defective Motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum motor Y and motor control PWB (YC4) Motor control PWB (YC3) and engine PWB (YC9)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective drum motor Y. Replace the drum motor Y.
  Defective Motor control PWB. Replace the Motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2300
• Description: Fuser motor error
  After fuser motor is driven, the ready signal does not turn to L within 2 s. After fuser motor is stabilized, the ready signal is at the H level for 1 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective fuser motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser motor and feed PWB 1 (YC18) Feed PWB 1 (YC1) and engine PWB (YC6)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective fuser motor. Replace the fuser motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2500
• Description: Paper feed motor error
  After paper feed motor is driven, the ready signal does not turn to L within 2 s. After paper feed motor is stabilized, the ready signal is at the H level for 1 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective paper feed motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Paper feed motor and feed PWB 2 (YC2) Feed PWB 2 (YC1) and engine PWB (YC4)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective paper feed motor. Replace the paper feed motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2600
• Description: PF paper feed motor error (large capacity feeder)
  After PF paper feed motor is driven, the ready signal does not turn to L within 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF paper feed motor. Defective PF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF paper feed motor and PF main PWB (YC16)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF paper feed motor. Replace the PF paper feed motor.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 2610
• Description: PF paper feed motor error (paper feeder)
  After PF paper feed motor is driven, the ready signal does not turn to L within 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF paper feed motor and PF main PWB (YC16)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF paper feed motor. Replace the PF paper feed motor.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 2640
• Description: SD paper feed motor error (side deck)
  After SD paper feed motor is driven, the ready signal does not turn to L within 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective SD paper feed motor. Defective SD main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SD paper feed motor and SD main PWB (YC16)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective SD paper feed motor. Replace the SD paper feed motor.
  Defective SD main PWB. Replace the SD main PWB (Refer to the service manual for the paper feeder).

• Code: 2650
• Description: SM paper feed motor error (side multi tray)
  After SM paper feed motor is driven, the ready signal does not turn to L within 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective SM paper feed motor. Defective SM main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. SM paper feed motor and SM main PWB (YC5)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective SM paper feed motor. Replace the SM paper feed motor.
  Defective SM main PWB. Replace the SM main PWB (Refer to the service manual for the paper feeder).

• Code: 2660
• Description: PF paper feed motor error (side large capacity feeder)
  After PF paper feed motor is driven, the ready signal does not turn to L within 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF paper feed motor. Defective PF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF paper feed motor and PF main PWB (YC16)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF paper feed motor. Replace the PF paper feed motor.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 2670
• Description: PF paper feed motor error (side paper feeder)
  After PF paper feed motor is driven, the ready signal does not turn to L within 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective PF paper feed motor. Defective PF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. PF paper feed motor and PF main PWB (YC16)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective PF paper feed motor. Replace the PF paper feed motor.
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 2700
• Description: Color release motor error
  When the color release motor is driven, the color release sensor does not turn on/off for 5 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective color release motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the transfer belt unit connector if necessary.Check for continuity within the harness and, if none, replace the harness. Color release motor and engine PWB (YC3)
  Defective drive transmission system of motor. Replace the transfer belt unit.
  Defective color release motor. Replace the transfer belt unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2730
• Description: Transfer release motor error
  When the transfer release motor is driven, the transfer release sensor does not turn on/off for 5 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective transfer release motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer release motor and relay PWB (YC14) Relay PWB (YC14) and feed PWB 1 (YC14) Feed PWB 1 (YC1) and engine PWB (YC6)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective transfer release motor. Replace the transfer release motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2760
• Description: Transfer motor startup error
  Transfer motor is not stabilized within 5 s since the motor is activated.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective transfer motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer motor and feed PWB 1 (YC13) Feed PWB 1 (YC2) and engine PWB (YC5)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective transfer motor. Replace the transfer motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2770
• Description: Transfer skew error
  An abnormal value is detected to transfer skew sensor.
• Causes: Improper installation transfer belt unit. Defective connector cable or poor contact in the connector. Defective transfer skew sensor. Defective engine PWB.
• Remedy: Improper installation transfer belt unit. Reinstall the transfer belt unit.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer belt unit and engine PWB (YC3)
  Defective transfer skew sensor. Replace the transfer belt unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2780
• Description: Transfer skew sensor error
  An abnormal value is detected to transfer skew sensor.
• Causes: Defective connector cable or poor contact in the connector. Defective transfer skew sensor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer belt unit and engine PWB (YC3)
  Defective transfer skew sensor. Replace the transfer belt unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2790
• Description: Transfer skew motor error
  When the transfer skew motor is driven, timeouts (300 ms) were detected twice in a row.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective transfer skew motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer skew motor and engine PWB (YC3)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective transfer skew motor. Replace the transfer skew motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2810
• Description: Waste toner motor error
  Initialized when an error is constantly observed for 2 s after the waste toner motor is activated. An error is constantly observed for 2.5 s after rebooting. The lock detect signal won’t be H level three times in a row within 200 ms at 1.25 ms cycles after the waste toner motor has been driven.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective waste toner motor.Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Waste toner motor and front PWB (YC16) Front PWB (YC3) and engine PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective waste toner motor. Replace the waste toner motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2820
• Description: Transfer motor steady-state error
  After transfer motor is stabilized, the ready signal is at the H level for 5 s continuously. The counter value obtained by timer capture is lower than 2200 for 10 times in a row.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective transfer motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer motor and feed PWB 1 (YC13) Feed PWB 1 (YC2) and engine PWB (YC5)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective transfer motor. Replace the transfer motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2840
• Description: Transfer cleaning motor error
  After transfer cleaning motor is driven, the ready signal does not turn to L within 2 s. After transfer cleaning motor is stabilized, the ready signal is at the H level for 1 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective transfer cleaning motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer cleaning motor and engine PWB (YC3)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective transfer cleaning motor. Replace the transfer cleaning motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2850
• Description: Transfer belt motor sensor error
  The signal is not received for 100 ms in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective transfer motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer motor and feed PWB (YC13) Feed PWB (YC1) to engine PWB(YC6)
  Defective transfer motor. Replace the transfer motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2860
• Description: Transfer belt sensor error
  The signal is not received for 100 ms in succession. PWB.
• Causes: Defective connector cable or poor contact in the connector. Defective transfer belt sensor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Transfer belt sensor and engine PWB (YC3)
  Defective transfer belt sensor. Replace the transfer belt sensor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 2950
• Description: Motor control PWB communication error
  A communication error from the motor control PWB is detected 10 times in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective motor control PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Motor control PWB (YC3) and engine PWB (YC9)
  Defective motor control PWB. Replace the motor control PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4001
• Description: Polygon motor K synchronization error
  After polygon motor K is driven, the ready signal does not turn to L within 30 s. The polygon motor speed won’t stabilize within 10 s.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor K and LSU relay PWB (YC4) LSU relay PWB (YC4) and engine PWB (YC12)
  Defective polygon motor K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4002
• Description: Polygon motor C synchronization error
  After polygon motor C is driven, the ready signal does not turn to L within 30 s. The polygon motor speed won’t stabilize within 10 s.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor C and LSU relay PWB (YC9) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4003
• Description: Polygon motor M synchronization error
  After polygon motor M is driven, the ready signal does not turn to L within 30 s. The polygon motor speed won’t stabilize within 10 s.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor M and LSU relay PWB (YC7) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4004
• Description: Polygon motor Y synchronization error
  After polygon motor Y is driven, the ready signal does not turn to L within 30 s. The polygon motor speed won’t stabilize within 10 s.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor Y and LSU relay PWB (YC11) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor Y. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4011
• Description: Polygon motor K steadystate error
  After polygon motor K is stabilized, the ready signal is at the H level for 15 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor K and LSU relay PWB (YC4) LSU relay PWB (YC4) and engine PWB (YC12)
  Defective polygon motor K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4012
• Description: Polygon motor C steadystate error
  After polygon motor C is stabilized, the ready signal is at the H level for 15 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor C and LSU relay PWB (YC9) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4013
• Description: Polygon motor M steadystate error
  After polygon motor M is stabilized, the ready signal is at the H level for 15 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor M and LSU relay PWB (YC7) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4014
• Description: Polygon motor Y steadystate error
  After polygon motor Y is stabilized, the ready signal is at the H level for 15 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor Y and LSU relay PWB (YC11) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor Y. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4101
• Description: BD initialization error K
  After polygon motor K is driven, the BD signal is not detected for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC5) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4102
• Description: BD initialization error C
  After polygon motor C is driven, the BD signal is not detected for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC10) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4103
• Description: BD initialization error M
  After polygon motor M is driven, the BD signal is not detected for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC8) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4104
• Description: BD initialization error Y
  After polygon motor Y is driven, the BD signal is not detected for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB Y. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4201
• Description: BD steady-state error K
  The BD signal is not detected.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC5) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4202
• Description: BD steady-state error C
  The BD signal is not detected.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC10) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4203
• Description: BD steady-state error M
  The BD signal is not detected.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC8) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4204
• Description: BD steady-state error Y
  The BD signal is not detected.ector.
• Causes: Defective connector cable or poor contact in the connector. Defective PD PWB Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective PD PWB Y. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4300
• Description: Polygon motor phase error
  ASIC won’t settle in completion of phase adjustment for 2 s after a BD signal is detected.
• Causes: Defective laser scanner unit. Defective engine PWB.
• Remedy: Defective laser scanner unit. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4600
• Description: LSU cleaning motor error
  After LSU cleaning motor is driven, the ready signal does not turn to L within 2 s. After LSU cleaning motor is stabilized, the ready signal is at the H level for 1 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective LSU cleaning motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. LSU cleaning motor and engine PWB (YC21)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective LSU cleaning motor. Replace the LSU cleaning motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 5101
• Description: Main high-voltage error K
  Measure the inflowing current when Vpp is varied in 3 steps and verify if the difference of the currents of 0 and step 2 is less than 42 (51 if lower highvoltage board).
• Causes: Improper installation charger roller unit K. Defective connector cable or poor contact in the connector. Defective high voltage PWB 1. Defective engine PWB.
• Remedy: Improper installation charger roller unit K. Reinstall the charger roller unit K.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. High voltage PWB 1 (YC4) and engine PWB (YC17)
  Defective high voltage PWB 1. Replace the high voltage PWB 1 and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 5102
• Description: Main high-voltage error C
  Measure the inflowing current when Vpp is varied in 3 steps and verify if the difference of the currents of 0 and step 2 is less than 42 (51 if lower highvoltage board).
• Causes: Improper installation charger roller unit C. Defective connector cable or poor contact in the connector. Defective high voltage PWB 1. Defective engine PWB.
• Remedy: Improper installation charger roller unit C. Reinstall the charger roller unit C.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. High voltage PWB 1 (YC2) and engine PWB (YC16)
  Defective high voltage PWB 1. Replace the high voltage PWB 1 and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 5103
• Description: Main high-voltage error M
  Measure the inflowing current when Vpp is varied in 3 steps and verify if the difference of the currents of 0 and step 2 is less than 42 (51 if lower highvoltage board).
• Causes: Improper installation charger roller unit M. Defective connector cable or poor contact in the connector. Defective high voltage PWB 1. Defective engine PWB.
• Remedy: Improper installation charger roller unit M. Reinstall the charger roller unit M.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. High voltage PWB 1 (YC3) and engine PWB (YC17)
  Defective high voltage PWB 1. Replace the high voltage PWB 1 and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 5104
• Description: Main high-voltage error Y
  Measure the inflowing current when Vpp is varied in 3 steps and verify if the difference of the currents of 0 and step 2 is less than 42 (51 if lower highvoltage board).
• Causes: Improper installation charger roller unit Y. Defective connector cable or poor contact in the connector. Defective high voltage PWB 1. Defective engine PWB.
• Remedy: Improper installation charger roller unit Y. Reinstall the charger roller unit Y.
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. High voltage PWB 1 (YC1) and engine PWB (YC16)
  Defective high voltage PWB 1. Replace the high voltage PWB 1 and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6000
• Description: Broken fuser heater wire
  Fuser thermistor 1 does not reach 100° C/212 °F even after 60 s during warming up. The detected temperature of fuser thermistor 1 does not reach the specified temperature (ready indication temperature) for 420 s in warming up after reached to 100° C/212 °F.
• Causes: Defective connector cable or poor contact in the connector. Fuser thermostat triggered. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Power source PWB (YC3) and fuser IH PWB (YC1) Fuser IH PWB (YC4) and engine PWB (YC26)
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6020
• Description: Abnormally high fuser thermistor 1 temperature
  Fuser thermistor 1 detects a temperature higher than 240°C/464°F for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Shorted fuser thermistor 1. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Shorted fuser thermistor 1. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6030
• Description: Broken fuser thermistor 1 wire
  Input from fuser thermistor 1 is 984 or more (A/D value) continuously for 1 s. Verify if A/D read in the differential output won’t change by 4 or more when it was turned on for 10 seconds in a lowtemperature environment.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 1 wire. Fuser thermostat triggered. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 1 wire. Replace the fuser unit.
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6040
• Description: Fuser heater error
  Input from fuser thermistor 1 is abnormal value continuously for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 1 wire. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 1 wire. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6050
• Description: Abnormally low fuser thermistor 1 temperature
  Fuser thermistor 1 detects a temperature lower than 100°C/212°F for 1 s after warming up, during ready or during print. Fuser thermistor 1 detects a temperature lower than 70°C/ 158°F for 1 s during low power mode.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser thermistor 1. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Defective fuser thermistor 1. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6120
• Description: Abnormally high fuser thermistor 4 temperature
  Fuser thermistor 4 detects a temperature higher than 190°C/374°F for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Shorted fuser thermistor 4. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Shorted fuser thermistor 4. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6130
• Description: Broken fuser thermistor 4 wire
  Input from fuser thermistor 4 is 992 or more (A/D value) continuously for 60 s.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 4 wire. Defective fuser IH.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 4 wire. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6150
• Description: Abnormally low fuser thermistor 4 temperature
  Fuser thermistor 4 detects a temperature lower than 30°C/ 86°F for 1 s after warming up.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser thermistor 4. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Defective fuser thermistor 4. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6200
• Description: Broken fuser edge heater wire
  Fuser thermistor 2 does not reach 100° C/212 °F even after 60 s during warming up. The detected temperature of fuser thermistor 2 does not reach the specified temperature (ready indication temperature) for 420 s in warming up after reached to 100° C/212 °F.
• Causes: Defective connector cable or poor contact in the connector. Fuser thermostat triggered. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Power source PWB (YC3) and fuser IH PWB (YC1) Fuser IH PWB (YC4) and engine PWB (YC26)
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6220
• Description: Abnormally high fuser thermistor 2 temperature
  Fuser thermistor 2 detects a temperature higher than 245°C/473°F for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Shorted fuser thermistor 2. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Shorted fuser thermistor 2. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6230
• Description: Broken fuser thermistor 2 wire
  The Input signal from the fuser thermistor 2 is 992 or more (A/D value) continuously for 1 s when the temperature at the fuser thermistor 1 is greater than 100°C/212°F during warming up.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 2 wire. Fuser thermostat triggered. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 2 wire. Replace the fuser unit.
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6250
• Description: Abnormally low fuser thermistor 2 temperature
  Fuser thermistor 2 detects a temperature lower than 100°C/212°F for 1 s during ready or print. Fuser thermistor 2 detects a temperature lower than 50°C/ 122°F for 1 s during warming up.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser thermistor 2. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Defective fuser thermistor 2. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6320
• Description: Abnormally high fuser thermistor 3 temperature
  Fuser thermistor 3 detects a temperature higher than 205°C/401°F for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Shorted fuser thermistor 3. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Shorted fuser thermistor 3. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6330
• Description: Broken fuser thermistor 3 wire
  Fuser thermistor 3 detects a temperature lower than 20°C/ 68°F continuously for 1 s
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 3 wire. Fuser thermostat triggered. Defective fuser IH. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 3 wire. Replace the fuser unit.
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6600
• Description: Fuser belt rotation error
  A belt rotating pulse is not received for 1 s. (Engine CPU)
• Causes: Defective connector cable or poor contact in the connector. Defective fuser belt sensor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Defective fuser belt sensor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6610
• Description: Fuser release motor error
  When the fuser release motor is driven, the fuser release sensor does not turn on/off for 5 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of motor. Defective fuser release motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective fuser release motor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6710
• Description: Fuser IH PWB CPU reset error
  Watch doc timer has been overflowed.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6720
• Description: Fuser IH belt rotation error
  A belt rotating pulse is not received for 2 s.tiv
• Causes: Defective connector cable or poor contact in the connector. Defective fuser belt sensor. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and engine PWB (YC26)
  Defective fuser belt sensor. Replace the fuser unit.
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6730
• Description: Abnormally high fuser IH PWB temperature 1
  The input detect temperature is greater than 105°C/221 °F.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6740
• Description: Abnormally high fuser IH PWB temperature 2
  The input detect temperature is greater than 105°C/221 °F.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6750
• Description: Fuser IH output over-current error
  The output current is greater than 90A for 10 ms in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6760
• Description: Fuser IH input over-current error
  The input current is greater than 20A(100V/120V), 10A(200V) for 100 ms in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6770
• Description: Fuser IH low electric power error
  The preset power is less than 0.6 times of it for 120 ms in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6900
• Description: Fuser belt cooling fan error
  When the fuser edge fan motor 1 , 2 is driven, alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser edge fan motor 1 or 2. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser edge fan motor 1 and front PWB (YC26) Fuser edge fan motor 2 and fuser PWB (YC2) Fuser PWB (YC1) and engine PWB (YC26)
  Defective fuser edge fan motor 1 or 2. Replace the fuser edge fan motor 1 or 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6910
• Description: Engine software ready error
  The device won’t engage in ready state in 60 minutes after warming-up has began.
• Causes: Defective engine software. Defective engine PWB.
• Remedy: Defective engine software. Install the engine software.
  Defective engine PWB. Replace the engine PWB and check for correct operation(see page 1-5-49).

• Code: 6920
• Description: Fuser front fan motor error
  When the fuser front fan motor is driven, alarm signal is detected for 5 s continuously
• Causes: Defective connector cable or poor contact in the connector. Defective fuser front fan motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser front fan motor and engine PWB (YC26)
  Defective fuser front fan motor. Replace fuser front fan motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6930
• Description: Fuser rear fan motor error
  When the fuser rear fan motor is driven, alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser rear fan motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, Fuser rear fan motor and fuser PWB (YC2) Fuser PWB (YC1) and engine PWB (YC26)
  Defective fuser rear fan motor. Replace fuser rear fan motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6940
• Description: IH fan motor error
  When the IH fan motor is driven, the alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective IH fan motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. IH fan motor and feed PWB 1 (YC11) Feed PWB 1 (YC2) and engine PWB (YC5)
  Defective IH fan motor. Replace the IH fan motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6950
• Description: Fuser IH PWB communication error
  No response is received in 30 ms since a command is sent to IHCPU. A checksum error is detected 10 times in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6960
• Description: Current PWB error
  Less than 1A is continuously observed for 5 s.
• Causes: Defective current PWB.
• Remedy: Defective current PWB. Replace the current PWB and check for correct operation.

• Code: 6990
• Description: Fuser power supply incompatibility
  Information won’t match between the engine backup and the fuser IH PWB.
• Causes: Differences in settings after initialization. Defective fuser IH PWB. Defective engine PWB. Data damage of EEPROM.
• Remedy: Differences in settings after initialization When this has happened after initialization using U201, make settings identical with the voltages on the IH PWB using U169.
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.
  Data damage of EEPROM. Contact the Service Administrative Division.

• Code: 7001
• Description: Toner motor K error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor K. Defective toner motor K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor K and engine PWB (YC27)
  Defective screw sensor K. Replace the screw sensor K.
  Defective toner motor K. Replace the toner motor K.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7002
• Description: Toner motor C error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor C. Defective toner motor C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor C and engine PWB (YC27)
  Defective screw sensor C. Replace the screw sensor C.
  Defective toner motor C. Replace the toner motor C.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7003
• Description: Toner motor M error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor M. Defective toner motor M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor M and engine PWB (YC27)
  Defective screw sensor M. Replace the screw sensor M.
  Defective toner motor M. Replace the toner motor M.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7004
• Description: Toner motor Y error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor Y. Defective toner motor Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor Y and engine PWB (YC27)
  Defective screw sensor Y. Replace the screw sensor Y.
  Defective toner motor Y. Replace the toner motor Y.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7101
• Description: Toner sensor K error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector. Defective toner sensor K. Failure of locking the developer waste slot at setup. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Defective toner sensor K. Replace developer unit K.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7102
• Description: Toner sensor C error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector. Defective toner sensor C. Failure of locking the developer waste slot at setup. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor C and front PWB (YC13) Front PWB (YC2) and engine PWB (YC10)
  Defective toner sensor C. Replace developer unit C.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7103
• Description: Toner sensor M error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector. Defective toner sensor M. Failure of locking the developer waste slot at setup. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Defective toner sensor M. Replace developer unit M.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7104
• Description: Toner sensor Y error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector. Defective toner sensor Y. Failure of locking the developer waste slot at setup. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Defective toner sensor Y. Replace developer unit Y.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7200
• Description: Broken outer temperature sensor 2 wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective outer temperature sensor 2. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Outer temperature sensor 2 and front PWB (YC19) Front PWB (YC2) and engine PWB (YC10)
  Defective outer temperature sensor 2. Replace outer temperature sensor 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7210
• Description: Short-circuited outer temperature sensor 2
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective outer temperature sensor 2. efective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Outer temperature sensor 2 and front PWB (YC19) Front PWB (YC2) and engine PWB (YC10)
  Defective outer temperature sensor 2. Replace outer temperature sensor 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7221
• Description: Broken LSU thermistor K wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC5) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7222
• Description: Broken LSU thermistor C wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC10) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7223
• Description: Broken LSU thermistor M wire The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC8) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7224
• Description: Broken LSU thermistor Y wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor Y. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7231
• Description: Short-circuited LSU thermistor K
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC5) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7232
• Description: Short-circuited LSU thermistor C
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC10) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7233
• Description: Short-circuited LSU thermistor M
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC8) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7234
• Description: Short-circuited LSU thermistor Y
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor Y. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7241
• Description: Broken developer thermistor K wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor K. Replace developer unit K.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7242
• Description: Broken developer thermistor C wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit C and front PWB (YC13) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor C. Replace developer unit C.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7243
• Description: Broken developer thermistor M wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor M. Replace developer unit M.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7244
• Description: Broken developer thermistor Y wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor Y. Replace developer unit Y.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7251
• Description: Short-circuited developer thermistor K
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor K. Replace developer unit K.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7252
• Description: Short-circuited developer thermistor C
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit C and front PWB (YC13) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor C. Replace developer unit C.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7253
• Description: Short-circuited developer thermistor M
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor M. Replace developer unit M.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7254
• Description: Short-circuited developer thermistor Y wire
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective developer thermistor Y. Defective engine PWB
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor Y. Replace developer unit Y.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7401
• Description: Developer unit K type mismatch error
  Absence of the developer unit K is detected.
• Causes: Defective connector cable or poor contact in the connector. Different type of the developer unit is installed.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7402
• Description: Developer unit C type mismatch error
  Absence of the developer unit C is detected.
• Causes: Defective connector cable or poor contact in the connector. Different type of the developer unit is installed.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit C and front PWB (YC13) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7403
• Description: Developer unit M type mismatch error
  Absence of the developer unit M is detected.
• Causes: Defective connector cable or poor contact in the connector. Different type of the developer unit is installed.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7404
• Description: Developer unit Y type mismatch error
  Absence of the developer unit Y is detected.
• Causes: Defective connector cable or poor contact in the connector. Different type of the developer unit is installed.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7601
• Description: ID sensor 1 error
  An abnormal value is detected in the input data to ID sensor 1. Dark potential error FrontDarkP and FrontDarkS are greater than 0.80V. Light potential error FrontBrightS is smaller than FrontDarkS. FrontBrightP is smaller than FrontDarkP + 0.5V.
• Causes: Defective connector cable or poor contact in the connector. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. ID sensor 1 and feed PWB 1 (YC10) Feed PWB 1 (YC1) and engine PWB (YC6)
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7602
• Description: ID sensor 2 error
  Dark potential error RearDarkP and RearDarkS are greater than 0.80V. Light potential error RearBrightS is smaller than RearDarkS. RearBrightP is smaller than RearDarkP + 0.5V.
• Causes: Defective connector cable or poor contact in the connector. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. ID sensor 2 and feed PWB 1 (YC10) Feed PWB 1 (YC1) and engine PWB (YC6)
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7800
• Description: Broken outer temperature sensor 1 wire
  The device did not respond for more than 5 ms during reading, in 5 times.
• Causes: Defective connector cable or poor contact in the connector. Defective outer temperature sensor 1. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Outer temperature sensor 1 and front PWB (YC16) Front PWB (YC2) and engine PWB (YC10)
  Defective outer temperature sensor 1. Replace outer temperature sensor 1.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7901
• Description: Drum K EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective drum PWB K.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum PWB K and front PWB (YC7) Front PWB (YC2) and engine PWB (YC10)
  Defective drum PWB K. Replace the drum unit K.

• Code: 7902
• Description: Drum C EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective drum PWB C.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum PWB C and front PWB (YC12) Front PWB (YC2) and engine PWB (YC10)
  Defective drum PWB C. Replace the drum unit C.

• Code: 7903
• Description: Drum M EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective drum PWB M.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum PWB M and front PWB (YC10) Front PWB (YC2) and engine PWB (YC10)
  Defective drum PWB M. Replace the drum unit M.

• Code: 7904
• Description: Drum Y EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective drum PWB Y.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum PWB Y and front PWB (YC14) Front PWB (YC2) and engine PWB (YC10)
  Defective drum PWB Y. Replace the drum unit Y.

• Code: 7911
• Description: Developer unit K EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective developer unit K.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Defective developer unit K. Replace the developer unit K.

• Code: 7912
• Description: Developer unit C EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective developer unit C.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit C and front PWB (YC13) Front PWB (YC2) and engine PWB (YC10)
  Defective developer unit C. Replace the developer unit C.

• Code: 7913
• Description: Developer unit M EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective developer unit M.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Defective developer unit M. Replace the developer unit M.

• Code: 7914
• Description: Developer unit Y EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective developer unit Y.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Defective developer unit Y. Replace the developer unit Y.

• Code: 7941
• Description: Laser scanner unit K EEPROM error
  Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB K.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB K and LSU relay PWB (YC5) LSU relay PWB (YC2) and engine PWB (YC11)
  Defective APC PWB K. Replace the laser scanner unit.

• Code: 7942
• Description: Laser scanner unit C EEPROM error
  Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB C.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB C and LSU relay PWB (YC10) LSU relay PWB (YC2) and engine PWB (YC11)
  Defective APC PWB C. Replace the laser scanner unit.

• Code: 7943
• Description: Laser scanner unit M EEPROM error
  Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB M.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB M and LSU relay PWB (YC8) LSU relay PWB (YC2) and engine PWB (YC11)
  Defective APC PWB M. Replace the laser scanner unit.

• Code: 7944
• Description: Laser scanner unit Y EEPROM error
  Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB Y.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB Y and LSU relay PWB (YC12) LSU relay PWB (YC2) and engine PWB (YC11)
  Defective APC PWB Y. Replace the laser scanner unit.

• Code: 8010
• Description: Punch motor error 1
  When the punch motor is driven, punch home position sensor does not turn on within 200 ms.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective punch home position sensor. Defective punch motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch motor and punch PWB (YC4) Punch home position sensor and punch PWB (YC8) Punch PWB (YC1) and DF main PWB (YC7)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch motor and punch PWB (YC4) Punch home position sensor and punch PWB (YC8) Punch PWB (YC1) and DF main PWB (YC8)
  Defective punch home position sensor. Replace the punch home position sensor.
  Defective punch motor. Replace the punch motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8020
• Description: Punch motor error 2
  Home position is not obtained in 3 s after home position is initialized or in standby.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective punch motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch motor and punch PWB (YC4) Punch PWB (YC1) and DF main PWB (YC7)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch motor and punch PWB (YC4) Punch PWB (YC1) and DF main PWB (YC8)
  Defective punch motor. Replace the punch motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8030
• Description: Punch motor error 3
  Home position does not turn from On to Off in 50 ms after home position has been initialized.cј
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective punch motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch motor and punch PWB (YC4) Punch PWB (YC1) and DF main PWB (YC7)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch motor and punch PWB (YC4) Punch PWB (YC1) and DF main PWB (YC8)
  Defective punch motor. Replace the punch motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8040
• Description: Abnormal simultaneous connection of mailbox
  When the mailbox is installed in both the main unit and the finisher.
• Causes: When the mailbox is installed in both the main unit and the finisher.
• Remedy: When the mailbox is installed in both the main unit and the finisher. Uninstall either of the mailboxes.

• Code: 8090
• Description: DF paddle motor error
  When the DF paddle motor is driven, DF paddle sensor does not turn on within 1 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF paddle sensor. Defective DF paddle motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF paddle motor and DF main PWB (YC15) DF paddle sensor and DF main PWB (YC22)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF paddle motor and DF main PWB (YC11) DF paddle sensor and DF main PWB (YC20)
  Defective DF paddle sensor. Replace the DF paddle sensor.
  Defective DF paddle motor. Replace the DF paddle motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8100
• Description: DF eject release motor error
  When the DF eject release motor is driven, DF bundle discharge sensor does not turn on within 1 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher).
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF eject release motor and DF main PWB (YC12) DF bundle discharge sensor and DF main PWB (YC22)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF eject release motor and DF main PWB (YC10) DF bundle discharge sensor and DF main PWB (YC20)
  Defective DF bundle discharge sensor. Replace the DF bundle discharge sensor.
  Defective DF eject release motor. Replace the DF eject release motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8110
• Description: DF shift motor 1 error (4000-sheet finisher)
  When the DF shift motor 1 is driven, DF shift sensor 1 does not turn on within 160 ms.
• Causes: Defective connector cable or poor contact in the connector. Defective DF shift sensor 1. Defective DF shift motor 1. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF shift motor 1 and DF main PWB (YC14) DF shift sensor 1 and DF main PWB (YC23)
  Defective DF shift sensor 1. Replace the DF shift sensor 1.
  Defective DF shift motor 1. Replace the DF shift motor 1.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8120
• Description: DF shift motor 2 error (4000-sheet finisher)
  When the DF shift motor 2 is driven, DF shift sensor 2 does not turn on within 160 ms.
• Causes: Defective connector cable or poor contact in the connector. Defective DF shift sensor 2. Defective DF shift motor 2. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF shift motor 2 and DF main PWB (YC14) DF shift sensor 2 and DF main PWB (YC23)
  Defective DF shift sensor 2. Replace the DF shift sensor 2.
  Defective DF shift motor 2. Replace the DF shift motor 2.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8130
• Description: DF shift release motor error (4000-sheet finisher)
  When the DF shift release motor is driven, DF shift release sensor does not turn on within 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective DF shift release sensor. Defective DF shift release motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF shift release motor and DF main PWB (YC14) DF shift release sensor and DF main PWB (YC23)
  Defective DF shift release sensor. Replace the DF shift release sensor.
  Defective DF shift release motor. Replace the DF shift release motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8140
• Description: DF tray motor error 1
  When the main tray has started ascending, DF tray sensor 1 or DF tray upper surface sensor does not turn on within 20 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective sensor. Defective DF tray motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC16) DF tray sensor 1 and DF main PWB (YC22) DF tray upper surface sensor and DF main PWB (YC21, YC13)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC14) DF tray sensor 1 and DF main PWB (YC20) DF tray upper surface sensor and DF main PWB (YC18)
  Defective sensor. Replace DF tray sensor 1 or DF tray upper surface sensor.
  Defective DF tray motor. Replace the DF tray motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8150
• Description: DF tray motor error 2
  When the main tray has descended, DF tray sensor 1 or DF tray upper surface sensor does not turn off within 5 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective sensor. Defective DF tray motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC16) DF tray sensor 1 and DF main PWB (YC22) DF tray upper surface sensor and DF main PWB (YC21, YC13)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC14) DF tray sensor 1 and DF main PWB (YC20) DF tray upper surface sensor and DF main PWB (YC18)
  Defective sensor. Replace DF tray sensor 1 or DF tray upper surface sensor.
  Defective DF tray motor. Replace the DF tray motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8160
• Description: DF tray motor error 3
  When the main tray has descended, DF tray sensor 3 does not turn on within 20 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF tray sensor 3. Defective DF tray motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC16) DF tray sensor 3 and DF main PWB (YC23)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC14) DF tray sensor 3 and DF main PWB (YC20)
  Defective DF tray sensor 3. Replace DF tray sensor 3.
  Defective DF tray motor. Replace the DF tray motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8170
• Description: DF side registration motor 1 error 1
  When initial operation, DF side registration sensor 1 does not turn on within 3 s
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF side registration sensor 1. Defective DF side registration motor 1. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 1 and DF main PWB (YC15) DF side registration sensor 1 and DF main PWB (YC22)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 1 and DF main PWB (YC11) DF side registration sensor 1 and DF main PWB (YC20)
  Defective DF side registration sensor 1. Replace DF side registration sensor 1.
  Defective DF side registration motor 1. Replace DF side registration motor 1.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8180
• Description: DF side registration motor 1 error 2
  JAM6810 is detected twice.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF side registration sensor 1. Defective DF side registration motor 1. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 1 and DF main PWB (YC15) DF side registration sensor 1 and DF main PWB (YC22)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 1 and DF main PWB (YC11) DF side registration sensor 1 and DF main PWB (YC20)
  Defective DF side registration sensor 1. Replace DF side registration sensor 1.
  Defective DF side registration motor 1. Replace DF side registration motor 1.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8190
• Description: DF side registration motor 2 error 1
  When initial operation, DF side registration sensor 2 does not turn on within 3 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF side registration sensor 2. Defective DF side registration motor 2. Defective DF main PWB
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 2 and DF main PWB (YC15) DF side registration sensor 2 and DF main PWB (YC22)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 2 and DF main PWB (YC11) DF side registration sensor 2 and DF main PWB (YC20)
  Defective DF side registration sensor 2. Replace DF side registration sensor 2.
  Defective DF side registration motor 2. Replace DF side registration motor 2.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8200
• Description: DF side registration motor 2 error 2
  JAM6910 is detected twice.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF side registration sensor 2. Defective DF side registration motor 2. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 2 and DF main PWB (YC15) DF side registration sensor 2 and DF main PWB (YC22)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF side registration motor 2 and DF main PWB (YC11) DF side registration sensor 2 and DF main PWB (YC20)
  Defective DF side registration sensor 2. Replace DF side registration sensor 2.
  Defective DF side registration motor 2. Replace DF side registration motor 2.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8210
• Description: DF slide motor error
  When initial operation, DF staple sensor does not turn on within 3 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF staple sensor. Defective DF slide motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF slide motor and DF main PWB (YC12) DF staple sensor and DF main PWB (YC22)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF slide motor and DF main PWB (YC10) DF staple sensor and DF main PWB (YC20)
  Defective DF staple sensor. Replace the DF staple sensor.
  Defective DF slide motor. Replace the DF slide motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8230
• Description: DF staple motor error 1
  Staple JAM (DF) has been detected twice in a row. (The home position could not be detected in 600 ms since the motor was driven after jam was detected twice.)
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF staple sensor. Defective DF staple motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Staple unit and DF main PWB (YC17)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Staple unit and DF main PWB (YC11)
  Defective DF staple sensor. Defective DF staple motor. Replace the staple unit.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8240
• Description: DF staple motor error 2
  Staple JAM (DF) has been detected twice in a row. (The second JAM detection condition fullfilled with a lock detection signal maintained 1 V for 500 ms continuously, while the stapler motor was driven.)
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF staple motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Staple unit and DF main PWB (YC17)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Staple unit and DF main PWB (YC11)
  Defective DF staple motor. Replace the staple unit.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8250
• Description: DF tray motor error 4
  The lock signal of the motor is detected continuously for 10 s.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective DF tray motor. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC16) DF tray sensor 3 and DF main PWB (YC23)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF tray motor and DF main PWB (YC14) DF tray sensor 3 and DF main PWB (YC20)
  Defective DF tray motor. Replace the DF tray motor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8300
• Description: Center-folding unit communication error (4000-sheet finisher)
  Communication with the center- folding unit is not possible.
• Causes: Defective connector cable or poor contact in the connector. Defective CF set sensor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF main PWB (YC7) and DF main PWB (YC9)
  Defective CF set sensor. Replace the CF set sensor.
  Defective PWB. Replace the CF main PWB or the DF main PWB and check for correct operation.

• Code: 8310
• Description: CF side registration motor 2 error (4000-sheet finisher)
  When initial operation, CF side registration sensor 2 does not turn on within 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective CF side registration sensor 2. Defective CF side registration motor 2. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF side registration motor 2 and CF main PWB (YC10) CF side registration sensor 2 and CF main PWB (YC20)
  Defective CF side registration sensor 2. Replace CF side registration sensor 2.
  Defective CF side registration motor 2. Replace CF side registration motor 2.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8320
• Description: CF adjustment motor error (4000-sheet finisher)
  When initial operation, CF adjustment sensor does not turn on within 2.5 s.
• Causes: Defective connector cable or poor contact in the connector. Defective CF adjustment sensor 1, 2. Defective CF adjustment motor 1, 2. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF adjustment motor 1, 2 and CF main PWB (YC10) CF adjustment sensor 1, 2 and CF main PWB (YC20)
  Defective CF adjustment sensor 1, 2. Replace CF adjustment sensor 1, 2.
  Defective CF adjustment motor 1, 2. Replace CF adjustment motor 1, 2.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8330
• Description: CF blade motor error (4000-sheet finisher)
  When initial operation, CF blade sensor does not turn on within 3 s.
• Causes: Defective connector cable or poor contact in the connector. Defective CF blade sensor. Defective CF blade motor. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF blade motor and CF main PWB (YC15) CF blade sensor and CF main PWB (YC20)
  Defective CF blade sensor. Replace the CF blade sensor.
  Defective CF blade motor. Replace the CF blade motor.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8340
• Description: CF staple motor error 1 (4000-sheet finisher)
  Staple JAM (center-folding unit) has been detected twice in a row. (The home position could not be detected in 600 ms since the motor was driven after jam was detected twice.
• Causes: Defective connector cable or poor contact in the connector. Defective CF staple sensor. Defective CF staple motor. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF staple unit and CF main PWB (YC13)
  Defective CF staple sensor. Defective CF staple motor. Replace the CF staple unit.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8350
• Description: CF side registration motor 1 error (4000-sheet finisher)
  When initial operation, CF side registration sensor 1 does not turn on within 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective CF side registration sensor 1. Defective CF side registration motor 1. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF side registration motor 1 and CF main PWB (YC10) CF side registration sensor 1 and CF main PWB (YC20)
  Defective CF side registration sensor 1. Replace CF side registration sensor 1.
  Defective CF side registration motor 1. Replace CF side registration motor 1.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8360
• Description: CF main motor error (4000-sheet finisher)
  During driving the motor, lock signal is detected for 1 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective CF main motor. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF main motor and CF main PWB (YC16)
  Defective CF main motor. Replace the CF main motor.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8370
• Description: CF staple motor error 2 (4000-sheet finisher)
  Staple JAM (DF) has been detected twice in a row. (The second JAM detection condition fullfilled with a lock detection signal maintained 1 V for 1000 ms continuously, while the stapler motor was driven.)
• Causes: Defective connector cable or poor contact in the connector. Defective CF staple motor. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF staple unit and CF main PWB (YC13)
  Defective CF staple motor. Replace the CF staple unit.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8410
• Description: Punch slide motor error 1
  The punch slide sensor won’t turn On when home position has been moved by 30 mm.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective slide sensor. Defective punch slide motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch slide motor and punch PWB (YC3) Punch slide sensor and punch PWB (YC6) Punch PWB (YC1) and DF main PWB (YC7)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch slide motor and punch PWB (YC3) Punch slide sensor and punch PWB (YC6) Punch PWB (YC1) and DF main PWB (YC8)
  Defective slide sensor. Replace the punch slide sensor.
  Defective punch slide motor. Replace the punch slide motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8420
• Description: Punch slide motor error 2
  In detection of paper edges, the paper edge cannot be detected in 30 mm move.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective punch slide motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch slide motor and punch PWB (YC3) Punch PWB (YC1) and DF main PWB (YC7)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch slide motor and punch PWB (YC3) Punch PWB (YC1) and DF main PWB (YC8)
  Defective punch slide motor. Replace the punch slide motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8430
• Description: Punch unit communication error
  Communication failed to be established after the punch unit was hooked up.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch PWB (YC1) and DF main PWB (YC7)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Punch PWB (YC1) and DF main PWB (YC8)
  Defective PWB. Replace the punch PWB or the DF main PWB and check for correct operation.

• Code: 8500
• Description: Mailbox communication error (4000-sheet finisher)
  Communication failed to be established after the mailbox was hooked up.
• Causes: Defective connector cable or poor contact in the connector. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. MB main PWB (YC3) and DF main PWB (YC6)
  Defective PWB. Replace the MB main PWB or the DF main PWB and check for correct operation.

• Code: 8510
• Description: MB conveying motor error 1 (4000-sheet finisher)
  When initial operation, MB home position sensor does not turn on within 5 s.
• Causes: Defective connector cable or poor contact in the connector. Defective MB home position sensor. Defective MB conveying motor. Defective MB main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. MB conveying motor and MB main PWB (YC5) MB home position sensor and MB main PWB (YC2)
  Defective MB home position sensor. Replace the MB home position sensor.
  Defective MB conveying motor. Replace the MB conveying motor.
  Defective MB main PWB. Replace the MB main PWB and check for correct operation.

• Code: 8520
• Description: MB conveying motor error 2 (4000-sheet finisher)
  When standby operation, MB home position sensor does not turn off within 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective MB home position sensor. Defective MB conveying motor. Defective MB main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. MB conveying motor and MB main PWB (YC5) MB home position sensor and MB main PWB (YC2)
  Defective MB home position sensor. Replace the MB home position sensor.
  Defective MB conveying motor. Replace the MB conveying motor.
  Defective MB main PWB. Replace the MB main PWB and check for correct operation.

• Code: 8800
• Description: Document finisher main program error Document finisher main program error at power up.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC4) and engine PWB (YC18)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC7) and engine PWB (YC18)
  Defective PWB. Replace the DF main PWB or the engine PWB and check for correct operation.

• Code: 8900
• Description: Document finisher backup error
  Read and write data does not match 3 times in succession.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Improper installation EEPROM. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC4) and engine PWB (YC18)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC7) and engine PWB (YC18)
  Improper installation EEPROM. Check the installation of the EEPROM and remedy if necessary.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8930
• Description: Center-folding unit backup error (4000-sheet finisher)
  Read and write data does not match 3 times in succession.
• Causes: Defective connector cable or poor contact in the connector. Improper installation EEPROM. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF main PWB (YC7) and DF main PWB (YC9)
  Improper installation EEPROM. Check the installation of the EEPROM and remedy if necessary.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: F000
• Description: Communication error between main PWB and operation PWB
• Causes: Defective main PWB. Defective operation PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.
  Defective operation PWB. Replace the operation PWB and check for correct operation.

• Code: F010
• Description: Main PWB checksum error
• Causes: Defective main PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.

• Code: F040
• Description: Communication error between main PWB and print engine
• Causes: Defective main PWB. Defective engine PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: F050
• Description: Print engine ROM checksum error
• Causes: Defective engine software. Defective engine PWB.
• Remedy: Defective engine software. Install the engine software.
  Defective engine PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace engine PWB.

• Code: F278
• Description: Power supply in drive system error
• Causes: The main power switch was turned off before the machine was shutdown, or a power failure has occurred.
• Remedy: Turn on power. (To switch off power, after confirming the data lamp is turned off, perform shut-down on the operation panel, turn power off.)

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