[SOLVED] Quick fix Konica-Minolta 4750i list error codes

– Compatible Printer model: Konica-Minolta bizhub 4750i
– Konica-Minolta bizhub 4750i Error Codes with quick guides:

Code: C0103
Description: Tray 2 drive motor malfunction (When PF-P20 or PF-P21 is installed)
The motor lock signal remains HIGH for a predetermined continuous period of time while the motor is turning.
Causes: <When PF-P20 or PF-P21 is installed>
• Tray 2 drive motor (M1/2)
• Tray 2 PC control board (PCCB/2)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M1/2-PCCB/2 CN4 for proper connection and correct as necessary.
2. Check the connector between PCCB/2 CN1-relay CN24-BASEB CN21E for proper connection and correct as necessary.
3. Check the connector of M1/2 for proper drive coupling and correct as necessary.
4. Check CPUB for proper installation and correct as necessary.
5. M1/2 load check
• Check code: 28
• Multi code: 1, 2
• Control signal: PCCB/2 CN4-1 to 7
• Location of electrical component: 18-P
6. Replace M1/2.
7. PCCB/2 F1 conduction check
8. Replace PCCB/2.
9. Replace CPUB.
10. Replace BASEB.

Code: C0104
Description: Tray 3 drive motor malfunction (When PF-P20 or PF-P21 is installed)
The motor lock signal remains HIGH for a predetermined continuous period of time while the motor is turning.
Causes: <When PF-P20 or PF-P21 is installed>
• Tray 3 drive motor (M1/3)
• Tray 3 PC control board (PCCB/3)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M1/3-PCCB/3 CN4 for proper connection and correct as necessary.
2. Check the connector between PCCB/3 CN1-relay CN2PC-PCCB/2 CN2 for proper connection and correct as necessary.
3. Check the connector between PCCB/2 CN1-relay CN24-BASEB CN21E for proper connection and correct as necessary.
4. Check the connector of M1/3 for proper drive coupling and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. M1/3 load check
• Check code: 28
• Multi code: 3, 4
• Control signal: PCCB/3 CN4-1 to 7
• Location of electrical component: 18-P
7. Replace M1/3.
8. PCCB/3 F1 and F2 conduction check
9. Replace PCCB/3.
10. Replace CPUB.
11. Replace BASEB.

Code: C0202
Description: Tray 1 feeder up/down abnormality
The tray 1 upper limit sensor (PS7) is not turned ON (blocked) even after the set period of time has elapsed after the paper lift-up operation for the drawer began.
Causes: • Tray 1 lift-up motor (M6)
• Tray 1 upper limit sensor (PS7)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Remove the tray and check to see if a piece of paper is not left inside the machine.
2. Check the connector between M6-BASEB CN18E for proper connection and correct as necessary.
3. Check the connector of M6 for proper drive coupling and correct as necessary.
4. Check the connector between PS7-BASEB CN22E for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. PS7 I/O check, sensor check
• Control signal: BASEB CN22EA-7 (ON)
• Location of electrical component: 12-C
7. M6 load check
• Check code: 23
• Multi code: 4
• Control signal: BASEB CN18E-6 to 7
• Location of electrical component: 2-C
8. Replace M6.
9. Replace CPUB.
10. BASEB F11E conduction check
11. Replace BASEB.

Code: C0204
Description: Tray 2 feeder up/down abnormality (When PF-P20 or PF-P21 is installed)
The tray 2 upper limit sensor (PS2/2) is not turned ON (blocked) even after the set period of time has elapsed after the paper lift-up operation for the drawer began.
Causes: • Tray 2 lift-up motor (M2/2)
• Tray 2 upper limit sensor (PS2/2)
• Tray 2 PC control board (PCCB/2)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Remove the tray and check to see if a piece of paper is not left inside the machine.
2. Check the connector between M2/2-PCCB/2 CN4 for proper connection and correct as necessary.
3. Check the connector of M2/2 for proper drive coupling and correct as necessary.
4. Check the connector between PS2/2-PCCB/2 CN3 for proper connection and correct as necessary.
5. Check the connector between PCCB/2 CN1-relay CN24-BASEB CN21E for proper connection and correct as necessary.
6. Check CPUB for proper installation and correct as necessary.
7. PS2/2 I/O check, sensor check
• Control signal: PCCB/2 CN3-9 (ON)
• Location of electrical component: 18-X
8. M2/2 load check
• Check code: 23
• Multi code: 5
• Control signal: PCCB/2 CN4-8 to 9
• Location of electrical component: 18-P
9. Replace M2/2.
10. Replace PCCB/2.
11. Replace CPUB.
12. Replace BASEB.

Code: C0206
Description: Tray 3 feeder up/down abnormality (When PF-P20 or PF-P21 is installed)
The tray 3 upper limit sensor (PS2/3) is not turned ON (blocked) even after the set period of time has elapsed after the paper lift-up operation for the drawer began.
Causes: • Tray 3 lift-up motor (M2/3)
• Tray 3 upper limit sensor (PS2/3)
• Tray 3 PC control board (PCCB/3)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Remove the tray and check to see if a piece of paper is not left inside the machine.
2. Check the connector between M2/3-PCCB/3 CN4 for proper connection and correct as necessary.
3. Check the connector of M2/3 for proper drive coupling and correct as necessary.
4. Check the connector between PS2/3-PCCB/3 CN3 for proper connection and correct as necessary.
5. Check the connector between PCCB/3 CN1-relay CN2PC-PCCB/2 CN2 for proper connection and correct as necessary.
6. Check the connector between PCCB/2 CN1-relay CN24-BASEB CN21E for proper connection and correct as necessary.
7. Check CPUB for proper installation and correct as necessary.
8. PS2/3 I/O check, sensor check
• Control signal: PCCB/3 CN3-9 (ON)
• Location of electrical component: 18-X
9. M2/3 load check
• Check code: 23
• Multi code: 6
• Control signal: PCCB/3 CN4-8 to 9
• Location of electrical component: 18-P
10. Replace M2/3.
11. PCCB/3 F2 conduction check
12. Replace PCCB/3.
13. Replace CPUB.
14. Replace BASEB.

Code: C2350
Description: Toner suction fan failure to turn
The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
Causes: • Toner suction fan (FM2)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between FM2-relay CN10-BASEB CN18E for proper connection and correct as necessary.
2. Check the fan for possible overload and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. FM2 load check
• Check code: 42
• Multi code: 3
• Control signal: BASEB CN18E-14 (REM), BASEB CN18E-16 (LOCK)
• Location of electrical component: 3-C
5. Replace FM2.
6. Replace CPUB.
7. Replace BASEB.

Code: C2414
Description: Imaging unit/K new article release
The status with the new unit is not cleared after the new imaging unit is set.
Causes: • Imaging unit/K
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Reinstall the imaging unit.
2. Check the connector between the imaging unit/K-relay CN6-BASEB CN14E for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace the imaging unit.
5. Replace CPUB.
6. Replace BASEB.

Code: C2557
Description: Abnormally low toner density detected black TCR sensor
When sampling data is determined in TC ratio calculation control, TCR sensor output is lower than a predetermined value for a predetermined number of times in a row even though there is toner in the toner cartridge.
Causes: • Imaging unit/K
• Toner transport motor (M4)
• Toner supply motor (M5)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Perform image troubleshooting procedure if image density is low.
2. Reinstall the imaging unit.
3. Check the connector between the imaging unit/K-relay CN6-BASEB CN14E for proper connection and correct as necessary.
4. Check the connector between M4-BASEB CN11E for proper connection and correct as necessary.
5. Check the connector between M5-BASEB CN11E for proper connection and correct as necessary.
6. Check CPUB for proper installation and correct as necessary.
7. M4, M5 operation check
• Control signal: BASEB CN11E-1 to 4 (M4), BASEB CN11E-5 to 8 (M5)
• Location of electrical component: 4-C
8. Replace the imaging unit.
9. Replace CPUB.
10. Replace BASEB.

Code: C2558
Description: Abnormally high toner density detected black TCR sensor
TC ratio in the imaging unit, which is determined by toner replenishing amount control mechanism, is a predetermined value or more for a given number of times consecutively.
Causes: • Imaging unit/K
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Reinstall the imaging unit.
2. Check the connector between the imaging unit/K-relay CN6-EXCB CN14E for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace the imaging unit.
5. Replace CPUB.
6. Replace BASEB.

Code: C255C
Description: Black TCR sensor adjustment failure
TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
Causes: • Imaging unit/K
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Reinstall the imaging unit.
2. Check the connector between the imaging unit/K-relay CN6-BASEB CN14E for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace the imaging unit.
5. Replace CPUB.
6. Replace BASEB.

Code: C2564
Description: Black TCR sensor failure
• Alarm signals for the TCR sensor is detected more than the predetermined number of times.
• This detection is used for detecting disconnection of TCR sensor connector.
Causes: • Imaging unit/K
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Reinstall the imaging unit.
2. Check the connector between the imaging unit/K-relay CN6-BASEB CN14E for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace the imaging unit.
5. Replace CPUB.
6. Replace BASEB.

Code: C2650
Description: Main backup media access error
• The error was found when reading out the data.
• The re-written data, which has been read out, checked and founded as error, is read out again and found as error.
• The error was found when reading out the counter value.
• The main body detects that the backup board is not mounted.
Causes: • Backup board (ERB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between ERB CN1-BASEB CN20E for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace CPUB.
4. Replace BASEB.
5. Replace ERB.
a. Replace the current ERB with a new one.
b. Replace the following components with new ones.
When the transfer belt unit, transfer roller and the fusing unit have been replaced with new ones, carry out the [Service Mode] -> [Counter] –
> [Life] -> [New Release].
• Imaging unit
• Transfer belt unit
• Fusing unit
• Transfer roller
• Feed roller, pick-up roller, separation roller (including options)
• Separation pad
• Toner filter
3. Turn ON the main power switch and check to see that warm-up is started.
Make sure that malfunction codes other than C2650 or improper IU/TC placement is not detected.
4. Set the various setting values again.
6. If the above actions do not solve the problem, contact KM.

Code: C2A24
Description: Toner cartridge/K new release failure
The status with the new unit is not cleared after the new toner cartridge is set.
Causes: • Toner cartridge/K
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Reinstall the toner cartridge.
2. Clean the connection between the toner cartridge and the main body if dirty.
3. Check the connector between the toner cartridge/K-BASEB CN11E for proper connection and correct as necessary.
4. Check CPUB for proper installation and correct as necessary.
5. Replace the toner cartridge.
6. Replace CPUB.
7. Replace BASEB.

Code: C3201
Description: Fusing motor failure to turn
The control circuit detects motor failure to turn while the motor is turning.
Causes: • Fusing motor (M3)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M3-BASEB CN17E for proper connection and correct as necessary.
2. Check the loading status of the fusing unit drive, and correct the error as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. M3 load check
• Check code: 45
• Multi code: 1, 2, 3
• Control signal: BASEB CN17E-6 to 10
• Location of electrical component: 1-C
5. Replace M3.
6. Replace CPUB.
7. BASEB F19E conduction check
8. Replace BASEB.

Code: C3202
Description: Fusing motor turning at abnormal timing
The control circuit detects motor turning while the motor remains stationary.
Causes: • Fusing motor (M3)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M3-BASEB CN17E for proper connection and correct as necessary.
2. Check the loading status of the fusing unit drive, and correct the error as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. M3 load check
• Check code: 45
• Multi code: 1, 2, 3
• Control signal: BASEB CN17E-6 to 10
• Location of electrical component: 1-C
5. Replace M3.
6. Replace CPUB.
7. BASEB F19E conduction check
8. Replace BASEB.

Code: C3425
Description: Fusing warm-up trouble
• Detected temperature of the heating roller temperature sensor (TEMS) does not go up a given range of temperature even after a lapse of given period of time at warm up.
• The temperature detected by the heating roller temperature sensor (TEMS) does not shift from the prestandby state even after the lapse of a predetermined period of time after the completion of warm-up.
Causes: • Fusing unit
• Heating roller temperature sensor (TEMS)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C3722
Description: Fusing abnormally high temperature detection (Edge of the heating roller)
Detected temperature of the heating roller thermistor/Edg (TH1) goes beyond a given temperature for a given period of time consecutively.
Causes: • Fusing unit
• C3722: Heating roller thermistor/Edg (TH1)
• C3725: Heating roller temperature sensor (TEMS)
• C3726: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. Replace DCPS.

Code: C3725
Description: Fusing abnormally high temperature detection (Main of the heating roller)
Detected temperature of the heating roller temperature sensor (TEMS) goes beyond a given temperature for a given period of time consecutively.
Causes: • Fusing unit
• C3722: Heating roller thermistor/Edg (TH1)
• C3725: Heating roller temperature sensor (TEMS)
• C3726: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. Replace DCPS.

Code: C3726
Description: Fusing abnormally high temperature detection (Center of the heating roller)
Detected temperature of the heating roller thermistor/Ctr (TH2) goes beyond a given temperature for a given period of time consecutively.
Causes: • Fusing unit
• C3722: Heating roller thermistor/Edg (TH1)
• C3725: Heating roller temperature sensor (TEMS)
• C3726: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. Replace DCPS.

Code: C3731
Description: Fusing abnormally high temperature detection (hard protector)
The hard protector signal malfunction is detected for a predetermined continuous period of time or more.
Causes: • Fusing unit
• Heating roller thermistor/Edg (TH1)
• Heating roller temperature sensor (TEMS)
• Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. Replace DCPS.

Code: C3825
Description: Fusing abnormally low temperature detection (Main of the heating roller)
The heating roller temperature sensor (TEMS) continues to detect a temperature lower than a predetermined one for a predetermined period of time.
Causes: • Fusing unit
• C3825: Heating roller temperature sensor (TEMS)
• C3826: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C3826
Description: Fusing abnormally low temperature detection (Center of the heating roller)
The heating roller thermistor/Ctr (TH2) continues to detect a temperature lower than a predetermined one for a predetermined period of time.
Causes: • Fusing unit
• C3825: Heating roller temperature sensor (TEMS)
• C3826: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C3922
Description: Fusing sensor wire breaks detection (Edge of the heating roller)
The maximum value and minimum value of detected temperature of the heating roller thermistor/Edg (TH1) is compared after a lapse of given time from starting of warm up and the gap between the value of maximum and minimum is below or above given temperatures.
Causes: • Fusing unit
• C3922: Heating roller thermistor/Edg (TH1)
• C3925: Heating roller temperature sensor (TEMS)
• C3926: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C3925
Description: Fusing sensor wire breaks detection (Main of the heating roller)
The maximum value and minimum value of detected temperature of the heating roller temperature sensor (TEMS2) is compared after a lapse of given time from starting of warm up and the gap between the value of maximum and minimum is below or above given temperatures.
Causes: • Fusing unit
• C3922: Heating roller thermistor/Edg (TH1)
• C3925: Heating roller temperature sensor (TEMS)
• C3926: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C3926
Description: Fusing sensor wire breaks detection (Center of the heating roller)
The maximum value and minimum value of detected temperature of the heating roller thermistor/Ctr (TH2) is compared after a lapse of given time from starting of warm up and the gap between the value of maximum and minimum is below or above given temperatures.
Causes: • Fusing unit
• C3922: Heating roller thermistor/Edg (TH1)
• C3925: Heating roller temperature sensor (TEMS)
• C3926: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C392B
Description: Fusing sensor wire breaks detection (difference of temperature)
The difference between the temperature corrected by the heating roller thermistor/Edg (TH1) and the temperature detected by the heating roller thermistor/Ctr (TH2) exceeds a predetermined value.
Causes: • Fusing unit
• Heating roller thermistor/Edg (TH1)
• Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C392C
Description: Fusing sensor wire breaks abnormality (heating detection)
The heating detection thermistor AD value is higher than the threshold value longer than predetermined period of time.
Causes: • Fusing unit
• Heating roller thermistor/Edg (TH1)
• Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C392D
Description: Fusing sensor wire breaks abnormality (heating compensation)
The heating compensation thermistor AD value is higher than the threshold value longer than predetermined period of time.
Causes: • Fusing unit
• Heating roller thermistor/Edg (TH1)
• Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C392E
Description: Fusing sensor wire breaks abnormality (heating GND)
The heating detection thermistor AD value and the heating compensation thermistor AD value are higher than the threshold value longer than predetermined period of time.
Causes: • Fusing unit
• Heating roller thermistor/Edg (TH1)
• Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS FU181 conduction check
10. Replace DCPS.

Code: C4091
Description: Engine communication error
Communication with the CTL is interrupted for one min. or longer during a stabilization sequence.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Reboot the machine.
2. Replace CPUB.
3. Replace BASEB.

Code: C40A2
Description: Mechanical controller PF communication data error
A CPU communication error is detected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. BASEB F15E and PTC2E conduction check
6. Replace BASEB.

Code: C40A3
Description: Mechanical controller PF transmission timeout
A CPU communication error is detected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. BASEB F15E and PTC2E conduction check
6. Replace BASEB.

Code: C40A4
Description: Mechanical controller PF communication pulse error
A CPU communication error is detected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. BASEB F15E and PTC2E conduction check
6. Replace BASEB.

Code: C40A5
Description: QSPI communication clock switching error
A CPU communication error is detected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. BASEB F15E and PTC2E conduction check
6. Replace BASEB.

Code: C40A6
Description: Mechanical controller ASIC communication error
A CPU communication error is detected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. BASEB F15E and PTC2E conduction check
6. Replace BASEB.

Code: C40C3
Description: CTL PF transmission timeout 1
A CPU communication error is detected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. BASEB F15E and PTC2E conduction check
6. Replace BASEB.

Code: C40C5
Description: CTL PF transmission timeout 2
A CPU communication error is detected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. BASEB F15E and PTC2E conduction check
6. Replace BASEB.

Code: C4101
Description: Polygon motor rotation trouble
• The polygon motor fails to turn stably even after the lapse of a given period of time after activating and changing rotation speed the polygon motor.
• Motor lock signal detects HIGH for a given period time consecutively during the polygon motor is rotating.
Causes: • PH unit
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between the PH unit-BASEB CN5E for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Polygon motor load check
• Check code: 32
• Multi code: 1, 3
4. Replace the PH unit.
5. Replace CPUB.
6. Replace BASEB.

Code: C4501
Description: Laser malfunction
• SOS signal is not detected even after the lapse of a given period of time after starting the laser output.
• SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
Causes: • PH unit
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between the PH unit-BASEB CN13 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the PH unit.
4. Replace CPUB.
5. Replace BASEB.

Code: C5102
Description: Main motor failure to turn
The control circuit detects motor failure to turn while the motor is turning.
Causes: • Main motor (M1)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M1-BASEB CN17E for proper connection and correct as necessary.
2. Check the loading status of the main drive, and correct the error as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. M1 load check
• Check code: 40
• Multi code: 1, 2
• Control signal: BASEB CN17E-1 to 5
• Location of electrical component: 1-C
5. Replace M1.
6. Replace CPUB.
7. BASEB F18E conduction check
8. Replace BASEB.

Code: C5103
Description: Main motor turning at abnormal timing
The control circuit detects motor turning while the motor remains stationary.
Causes: • Main motor (M1)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M1-BASEB CN17E for proper connection and correct as necessary.
2. Check the loading status of the main drive, and correct the error as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. M1 load check
• Check code: 40
• Multi code: 1, 2
• Control signal: BASEB CN17E-1 to 5
• Location of electrical component: 1-C
5. Replace M1.
6. Replace CPUB.
7. BASEB F18E conduction check
8. Replace BASEB.

Code: C5357
Description: Machine cooling fan failure to turn
The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
Causes: • Machine cooling fan (FM1)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between FM1-relay CN23-BASEB CN18E for proper connection and correct as necessary.
2. Check the fan for possible overload and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. FM1 load check
• Check code: 42
• Multi code: 1, 2
• Control signal: BASEB CN18E-3 (REM), BASEB CN18E-5 (LOCK)
• Location of electrical component: 2-C
5. Replace FM1.
6. Replace CPUB.
7. Replace BASEB.

Quick fix Konica-Minolta 4750i list error codes

Solve Konica-Minolta bizhub 4750i Error codes

Code: C5360
Description: Clean unit fan failure to turn (When CU-202 is installed) (Europe models only)
The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
Causes: • Exhaust fan/1 (FM1)
• Exhaust fan/2 (FM2)
• Exhaust fan/3 (FM3)
• Clean unit drive board (CUDB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between CUDB CN1-relay CN35-BASEB CN25E for proper connection and correct as necessary.
2. Check the connector between FM1-relay CN101-CUDB CN2 for proper connection and correct as necessary.
3. Check the connector between FM2-relay CN102-CUDB CN2 for proper connection and correct as necessary.
4. Check the connector between FM3-relay CN103-CUDB CN2 for proper connection and correct as necessary.
5. Check the fan for possible overload and correct as necessary.
6. Check CPUB for proper installation and correct as necessary.
7. FM1 load check
• Check code: 42
• Multi code: 9, 10
• Control signal: CUDB CN2-1 (REM), CUDB CN2-3 (LOCK)
• Location of electrical component: 27-L
8. FM2 load check
• Check code: 42
• Multi code: 9, 10
• Control signal: CUDB CN2-4 (REM), CUDB CN2-6 (LOCK)
• Location of electrical component: 28-L
9. FM3 load check
• Check code: 42
• Multi code: 9, 10
• Control signal: CUDB CN2-7 (REM), CUDB CN2-9 (LOCK)
• Location of electrical component: 28-L
10. Replace the defective fan. (FM1/FM2/FM3)
11. Replace CUDB.
12. Replace CPUB.
13. Replace BASEB.

Code: C5372
Description: MFP control board CPU temperature failure
Temperature failure of CPU on the CPU board was detected.
Causes: • CPU cooling fan (FM3)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between FM3-BASEB CN17 for proper connection and correct as necessary.
2. Check the fan for possible overload and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. FM3 operation check
• Control signal: BASEB CN17-1 to 2
• Location of electrical component: 21-I
5. Replace CPUB.
6. BASEB ICP1 conduction check
7. Replace BASEB.

Code: C5501
Description: AC signal abnormality
The zero cross signal is not input.
Causes: • Fusing unit
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the connector between DCPS CN6-BASEB CN1E for proper connection and correct as necessary.
3. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
4. Check CPUB for proper installation and correct as necessary.
5. Replace the fusing unit.
6. Replace CPUB.
7. Replace BASEB.
8. Replace DCPS.

Code: C5601
Description: Engine control malfunction
Engine control malfunction is detected with port monitor control.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Rewrite the firmware.
3. Replace CPUB.
4. Replace BASEB.

Code: C5605
Description: Engine communication data error
A communication error is detected between CPUs.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace BASEB.

Code: C5606
Description: Engine transmission timeout
A communication error is detected between CPUs.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace BASEB.

Code: C5610
Description: PH LD drive communication error
• LD drive write data and read data disagree with each other a predetermined number of consecutive times.
• Different PH unit is installed.
Causes: • PH unit
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Reboot the machine.
2. Check the connector between the PH unit-BASEB CN13 for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace the PH unit.
5. Replace CPUB.
6. Replace BASEB.

Code: C5620
Description: Mechanical controller WDT error
Communication error is detected in mechanical controller ASIC.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace BASEB.

Code: C5701
Description: Power supply malfunction
A condition is detected in which no power is being supplied to the base board (BASEB).
Causes: • Front door sensor (PS1)
• Right door sensor (PS2)
• Front door switch (SW2)
• Right door switch (SW5)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between PS1, PS2-BASEB CN16E for proper connection and correct as necessary.
2. Check the connector between SW2, SW5-relay CN36-DCPS CN3 for proper connection and correct as necessary.
3. Check the connector between DCPS CN4-BASEB CN3E for proper connection and correct as necessary.
4. Check the connector between DCPS CN6-BASEB CN1E for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace CPUB.
7. BASEB F5E conduction check
8. Replace BASEB.
9. Replace DCPS.

Code: C6001
Description: DF related configuration error 1
Inconsistency in the configuration with the installed DF is detected on the main body.
Causes: • DF control board (DFCB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the type of the installed DF and replace it if it is a wrong one.
2. Check to see the [Service mode] -> [System 2] -> [ADF Settings] is correct. It corrects, when a model is different.
3. Check the connector between DFCB CN9-BASEB CN6E for proper connection and correct as necessary.
4. Check CPUB for proper installation and correct as necessary.
5. Replace DFCB.
6. Replace CPUB.
7. Replace BASEB.

Code: C6002
Description: DF related configuration error 2
Inconsistency in the configuration with the installed DF is detected on the main body.
Causes: • DF control board (DFCB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the type of the installed DF and replace it if it is a wrong one.
2. Correct the harness connection between DFCB CN9-BASEB CN6E if faulty.
3. Check CPUB for proper installation and correct as necessary.

Code: C6102
Description: Drive system home sensor malfunction
• The scanner home sensor (PS21) is unable to detect the scanner located at its home position.
• The scanner home sensor (PS21) is unable to detect a scanner even when the scanner motor (M9) has been
driven to move the scanner over the maximum travelling distance.
• The scanner home sensor (PS21) detects the scanner when the scanner has moved the maximum travelling
distance from the position, at which it blocks the scanner home sensor (PS21).
Causes: • Scanner home sensor (PS21)
• Scanner motor (M9)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Correct or change the scanner drive (pulley, gear, belt) if it is faulty.
2. Correct the scanner motor set screw if loose.
3. Adjust [Image Position: Leading Edge] and [Sub Scan Zoom Adj.].
4. Check the connector between M9-BASEB CN9E for proper connection and correct as necessary.
5. Check the connector between PS21-BASEB CN8E for proper connection and correct as necessary.
6. Check CPUB for proper installation and correct as necessary.
7. PS21 I/O check, sensor check
• Control signal: BASEB CN8E-6 (ON)
• Location of electrical component: 23-K
8. M9 operation check
• Control signal: BASEB CN9E-1 to 4
• Location of electrical component: 22-K
9. Replace CPUB.
10. BASEB F10E or F16E conduction check.
11. Replace BASEB.

Code: C6704
Description: Image input time out
Image data is not input from the scanner to the CPU board (CPUB).
Causes: • CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Memory Bus Check] -> [Scanner -> Memory], and conduct the memory bus function.
2. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: C6751
Description: CCD clamp/gain adjustment failure
• The adjustment value is 0 or 255 during a CCD clamp adjustment.
• The peak value of the output data is 64 or less during a CCD gain adjustment.
Causes: • CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Check for possible extraneous light and correct as necessary.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: C6752
Description: ASIC clock input error (front side)
When starting the machine, verification on reading and writing the predetermined value for CPU (image processing section) on CPU board (CPUB) was conducted, and verification failure was detected.
Causes: • CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace IR CIS.
4. Replace CPUB.
5. Replace BASEB.

Code: C6753
Description: ASIC clock input error (back side)
When starting the machine, verification on reading and writing the predetermined value for CPU (image processing section) on CPU board (CPUB) was conducted, and verification failure was detected.
Causes: • DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DF CIS-DFCISRYB CN1 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the DF CIS module assy.
4. Replace CPUB.
5. Replace BASEB.

Code: C6754
Description: CIS clamp adjustment failure
After the gain adjustment is performed at the start-up, the CIS clamp adjustment value is too high or too low.
Causes: • DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Check for possible extraneous light and correct as necessary.
4. Clean the back side reading glass and the shading sheet if dirty.
5. Replace the DF CIS module assy.
6. Replace CPUB.
7. Replace BASEB.

Code: C6755
Description: CIS clamp adjustment failure
After the gain adjustment is performed at the start-up, the peak value of the output data is lower than a given value.
Causes: • DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Check for possible extraneous light and correct as necessary.
4. Clean the back side reading glass and the shading sheet if dirty.
5. Replace the DF CIS module assy.
6. Replace CPUB.
7. Replace BASEB.

Code: C6756
Description: CIS power-supply voltage malfunction
Power is not supplied to CIS after the lapse of a given period of time after the main power switch or power key is turned ON or the machine recovers from the sleep mode.
Causes: • CIS module (IR CIS)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check the connector between BASEB CN2E-DCPS CN5 for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.
7. Replace DCPS.

Code: C6902, C6903
Description: • C6902: Bus check NG1-1
• C6903: Bus check NG1-2
• C6902, C6903: When bus check (front side) detects an error.
• C6912, C6913: When bus check (back side) detects an error.
Causes: • CIS module (IR CIS)
• DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace CPUB.
5. Replace BASEB.

Code: C6F01 … C6FDD
Description: • C6F01: Scanner sequence trouble 1
• C6F02: Scanner sequence trouble 2
• C6F03: Scanner sequence trouble 3
• C6F04: Scanner sequence trouble 4
• C6F05: Scanner sequence trouble 5
• C6F06: Scanner sequence trouble 6
• C6F07: Scanner sequence trouble 7
• C6F08: Scanner sequence trouble 8
• C6F09: Scanner sequence trouble 9
• C6F0A: Scanner sequence trouble 10
• C6FDC: Scanner sequence trouble DC
• C6FDD: Scanner sequence trouble DD
The original transport interval becomes shorter than the predetermined value due to an original transport control error in original reading in DF.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• DF control board (DFCB)
Troubleshooting Guides: 1. Correct the cable connection between BASEB CN6E-DFCB CN9 if faulty.
2. Check CPUB for proper installation and correct as necessary.
3. Replace DFCB.
4. Replace CPUB.
5. Replace BASEB.

Code: C7111
Description: Tray 1 lift-up motor failure
After starting the motor, an error is detected for the malfunction detection signal.
Causes: • Tray 1 lift-up motor (M6)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M6-BASEB CN18E for proper connection and correct as necessary.
2. Check the connector of M6 for proper drive coupling and correct as necessary.
3. M6 conduction check
• Control signal: BASEB CN18E-6 to 7
• Location of electrical component: 2-C
4. Replace M6.
5. Replace BASEB.

Code: C7137
Description: Toner supply motor failure
After starting the motor, an error is detected for the malfunction detection signal.
Causes: • Toner supply motor (M5)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M5-BASEB CN11E for proper connection and correct as necessary.
2. Check the connector of M5 for proper drive coupling and correct as necessary.
3. M5 conduction check
• Control signal: BASEB CN11E-5 to 8
• Location of electrical component: 4-C
4. Replace M5.
5. Replace BASEB.

Code: C7138
Description: Toner transport motor failure
After starting the motor, an error is detected for the malfunction detection signal.
Causes: • Toner transport motor (M4)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between M4-BASEB CN11E for proper connection and correct as necessary.
2. Check the connector of M4 for proper drive coupling and correct as necessary.
3. M4 conduction check
• Control signal: BASEB CN11E-1 to 4
• Location of electrical component: 4-C
4. Replace M4.
5. Replace BASEB.

Code: C7201
Description: Tray 1 paper feed clutch failure
After starting the clutch, an error is detected for the malfunction detection signal.
Causes: • Tray 1 paper feed clutch (CL3)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between CL3-relay CN44-BASEB CN22E for proper connection and correct as necessary.
2. Check the connector of CL3 for proper drive coupling and correct as necessary.
3. CL3 conduction check
• Control signal: BASEB CN22EA-1 (ON)
• Location of electrical component: 12-C
4. Replace CL3.
5. Replace BASEB.

Code: C7206
Description: Bypass tray paper feed clutch failure
After starting the clutch, an error is detected for the malfunction detection signal.
Causes: • Bypass tray paper feed clutch (CL2)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between CL2-relay CN46-BASEB CN23E for proper connection and correct as necessary.
2. Check the connector of CL2 for proper drive coupling and correct as necessary.
3. CL2 conduction check
• Control signal: BASEB CN23E-10 (ON)
• Location of electrical component: 9-K
4. Replace CL2.
5. Replace BASEB.

Code: C720A
Description: Registration clutch failure
After starting the clutch, an error is detected for the malfunction detection signal.
Causes: • Registration clutch (CL4)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between CL4-relay CN45-BASEB CN22E for proper connection and correct as necessary.
2. Check the connector of CL4 for proper drive coupling and correct as necessary.
3. CL4 conduction check
• Control signal: BASEB CN22EA-3 (ON)
• Location of electrical component: 12-C
4. Replace CL4.
5. Replace BASEB.

Code: C720D
Description: ADU transport clutch failure
After starting the clutch, an error is detected for the malfunction detection signal.
Causes: • ADU transport clutch (CL5)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between CL5-relay CN47-BASEB CN23E for proper connection and correct as necessary.
2. Check the connector of CL5 for proper drive coupling and correct as necessary.
3. CL5 conduction check
• Control signal: BASEB CN23E-12 (ON)
• Location of electrical component: 9-K
4. Replace CL5.
5. Replace BASEB.

Code: C720E
Description: ADU forward rotation clutch failure
After starting the clutch, an error is detected for the malfunction detection signal.
Causes: • ADU forward rotation clutch (CL6)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between CL6-relay CN11-BASEB CN18E for proper connection and correct as necessary.
2. Check the connector of CL6 for proper drive coupling and correct as necessary.
3. CL6 conduction check
• Control signal: BASEB CN18E-8 (ON)
• Location of electrical component: 2-C
4. Replace CL6.
5. Replace BASEB.

Code: C720F
Description: ADU reverse rotation clutch failure
After starting the clutch, an error is detected for the malfunction detection signal.
Causes: • ADU reverse rotation clutch (CL7)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between CL7-relay CN39-BASEB CN18E for proper connection and correct as necessary.
2. Check the connector of CL7 for proper drive coupling and correct as necessary.
3. CL7 conduction check
• Control signal: BASEB CN18E-10 (ON)
• Location of electrical component: 3-C
4. Replace CL7.
5. Replace BASEB.

Code: C7243
Description: Exit path switch solenoid failure
After starting the solenoid, an error is detected for the malfunction detection signal.
Causes: • Exit path switch solenoid (SD1)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between SD1-relay CN12-BASEB CN18E for proper connection and correct as necessary.
2. Check the connector of SD1 for proper drive coupling and correct as necessary.
3. SD1 conduction check
• Control signal: BASEB CN18E-12 (ON)
• Location of electrical component: 3-C
4. Replace SD1.
5. Replace BASEB.

Code: C7311
Description: Machine cooling fan failure
After starting the fan, an error is detected for the malfunction detection signal.
Causes: • Machine cooling fan (FM1)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between FM1-relay CN23-BASEB CN18E for proper connection and correct as necessary.
2. Check the connector of FM1 for proper drive coupling and correct as necessary.
3. FM1 conduction check
• Control signal: BASEB CN18E-3 (REM), BASEB CN18E-5 (LOCK)
• Location of electrical component: 2-C
4. Replace FM1.
5. Replace BASEB.

Code: C7312
Description: Toner suction fan failure
After starting the fan, an error is detected for the malfunction detection signal.
Causes: • Toner suction fan (FM2)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between FM2-relay CN10-BASEB CN18E for proper connection and correct as necessary.
2. Check the connector of FM2 for proper drive coupling and correct as necessary.
3. FM2 conduction check
• Control signal: BASEB CN18E-14 (REM), BASEB CN18E-16 (LOCK)
• Location of electrical component: 3-C
4. Replace FM2.
5. Replace BASEB.

Code: C7502
Description: Tray 1 upper limit sensor failure
The tray 1 upper limit sensor (PS7) does not change even after the lapse of a predetermined period of time after tray 1 is opened and closed, after C0202 (Tray 1 feeder up/down abnormality) is detected.
Causes: • Tray 1 upper limit sensor (PS7)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between PS7-BASEB CN22E for proper connection and correct as necessary.
2. Replace PS7.
3. Replace BASEB.

Code: C7601
Description: Power line A1 error
The fuse detection unit detected an error for a predetermined time.
Causes: • Main motor (M1)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F18E conduction check
2. Check the connector between M1-BASEB CN17E for proper connection and correct as necessary.
3. M1 load check
• Check code: 40
• Multi code: 1, 2
• Control signal: BASEB CN17E-1 to 5
• Location of electrical component: 1-C
4. Replace M1.
5. Replace BASEB.

Code: C7604
Description: Power line A4 error
The fuse detection unit detected an error for a predetermined time.
Causes: • Fusing motor (M3)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F19E conduction check
2. Check the connector between M3-BASEB CN17E for proper connection and correct as necessary.
3. M3 load check
• Check code: 45
• Multi code: 1, 2, 3
• Control signal: BASEB CN17E-6 to 10
• Location of electrical component: 1-C
4. Replace M3.
5. Replace BASEB.

Code: C7605
Description: Power line A5 error
The fuse detection unit detected an error for a predetermined time.
Causes: • High voltage unit (HVPS)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F6E conduction check
2. Check the connector between HVPS-BASEB CN4E for proper connection and correct as necessary.
3. Replace HVPS.
4. Replace BASEB.

Code: C7607
Description: Power line A7 error
The fuse detection unit detected an error for a predetermined time.
Causes: • Bypass tray paper feed clutch (CL2)
• Tray 1 paper feed clutch (CL3)
• Registration clutch (CL4)
• ADU transport clutch (CL5)
• ADU forward rotation clutch (CL6)
• ADU reverse rotation clutch (CL7)
• Exit path switch solenoid (SD1)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F4E conduction check
2. Check the connector between CL2-relay CN46-BASEB CN23E for proper connection and correct as necessary.
3. Check the connector between CL3-relay CN44-BASEB CN22E for proper connection and correct as necessary.
4. Check the connector between CL4-relay CN45-BASEB CN22E for proper connection and correct as necessary.
5. Check the connector between CL5-relay CN47-BASEB CN23E for proper connection and correct as necessary.
6. Check the connector between CL6-relay CN11-BASEB CN18E for proper connection and correct as necessary.
7. Check the connector between CL7-relay CN39-BASEB CN18E for proper connection and correct as necessary.
8. Check the connector between SD1-relay CN12-BASEB CN18E for proper connection and correct as necessary.
9. CL2 conduction check
• Control signal: BASEB CN23E-10 (ON)
• Location of electrical component: 9-K
10. CL3 conduction check
• Control signal: BASEB CN22E<A>-1 (ON)
• Location of electrical component: 12-C
11. CL4 conduction check
• Control signal: BASEB CN22E<A>-3 (ON)
• Location of electrical component: 12-C
12. CL5 conduction check
• Control signal: BASEB CN23E-12 (ON)
• Location of electrical component: 9-K
13. CL6 conduction check
• Control signal: BASEB CN18E-8 (ON)
• Location of electrical component: 2-C
14. CL7 conduction check
• Control signal: BASEB CN18E-10 (ON)
• Location of electrical component: 3-C
15. SD1 conduction check
• Control signal: BASEB CN18E-12 (ON)
• Location of electrical component: 3-C
16. Replace CL2.
17. Replace CL3.
18. Replace CL4.
19. Replace CL5.
20. Replace CL6.
21. Replace CL7.
22. Replace SD1.
23. Replace BASEB.

Code: C760A
Description: Power line A10 error
The fuse detection unit detected an error for a predetermined time.
Causes: • PC control board (PCCB)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F8E conduction check
2. Check the connector between PCCB CN1-relay CN24-BASEB CN21E for proper connection and correct as necessary.
3. Replace PCCB.
4. Replace BASEB.

Code: C760F
Description: Power line A15 error
The fuse detection unit detected an error for a predetermined time.
Causes: • Clean unit drive board (CUDB)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F11E conduction check
2. Check the connector between CUDB CN1-relay CN35-BASEB CN25E for proper connection and correct as necessary.
3. Replace CUDB.
4. Replace BASEB.

Code: C7613
Description: Power line A19 error
The fuse detection unit detected an error for a predetermined time.
Causes: • Machine cooling fan (FM1)
• Toner suction fan (FM2)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F2E conduction check
2. Check the connector between FM1-relay CN23-BASEB CN18E for proper connection and correct as necessary.
3. Check the connector between FM2-relay CN10-BASEB CN18E for proper connection and correct as necessary.
4. Replace FM1.
5. Replace FM2.
6. Replace BASEB.

Code: C7615
Description: Power line A20 error
The fuse detection unit detected an error for a predetermined time.
Causes: • PH unit
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F3E conduction check
2. Check the connector between the PH unit-BASEB CN5E for proper connection and correct as necessary.
3. Replace the PH unit.
4. Replace BASEB.

Code: C7616
Description: Power line A21 error
The fuse detection unit detected an error for a predetermined time.
Causes: • Toner transport motor (M4)
• Toner supply motor (M5)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F5E conduction check
2. Check the connector between M4-BASEB CN11E for proper connection and correct as necessary.
3. Check the connector between M5-BASEB CN11E for proper connection and correct as necessary.
4. Replace M4.
5. Replace M5.
6. Replace BASEB.

Code: C7631
Description: Supply power line 1 error
All of the fuse detection units of the same supply power line (24V10) detected an error for a predetermined time.
Causes: • DC power supply (DCPS)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F1E, F2E, F3E, F4E conduction check
2. Check the connector between DCPS CN4-BASEB CN3E for proper connection and correct as necessary.
3. Check the connector between DCPS CN6-BASEB CN1E for proper connection and correct as necessary.
4. Replace DCPS.
5. Replace BASEB.

Code: C7632
Description: Supply power line 2 error
All of the fuse detection units of the same supply power line (24V21) detected an error for a predetermined time.
Causes: • DC power supply (DCPS)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F5E, F6E, F20E conduction check
2. Check the connector between DCPS CN4-BASEB CN3E for proper connection and correct as necessary.
3. Check the connector between DCPS CN6-BASEB CN1E for proper connection and correct as necessary.
4. Check the connector between SW2, SW5-relay CN36-DCPS CN3 for proper connection and correct as necessary.
5. Replace DCPS.
6. Replace BASEB.

Code: C7633
Description: Supply power line 3 error
All of the fuse detection units of the same supply power line (24V20) detected an error for a predetermined time.
Causes: • DC power supply (DCPS)
• Base board (BASEB)
Troubleshooting Guides: 1. BASEB F8E, F11E, F18E, F19E conduction check
2. Check the connector between DCPS CN4-BASEB CN3E for proper connection and correct as necessary.
3. Check the connector between DCPS CN6-BASEB CN1E for proper connection and correct as necessary.
4. Check the connector between SW2, SW5-relay CN36-DCPS CN3 for proper connection and correct as necessary.
5. Replace DCPS.
6. Replace BASEB.

Code: C8302
Description: DF cooling fan trouble
The lock signal continues to detect H during a given time while the DF cooling fan (FM4) is spinning.
Causes: • DF cooling fan (FM4)
• DF control board (DFCB)
Troubleshooting Guides: 1. Check the connector between FM4-relay CN112-DFCB CN4 for proper connection and correct as necessary.
2. Check the fan for possible overload and correct as necessary.
3. FM4 load check
• Check code: 60
• Multi code: 113
• Control signal: DFCB CN4-5 (REM), DFCB CN4-7 (LOCK)
• Location of electrical component: 22-X
4. Replace FM4.
5. Replace DFCB.

Code: C8401
Description: Data flash failure
Data flash does not access normally.
Causes: DF control board (DFCB)
Troubleshooting Guides: 1. Turn OFF the main power switch, unplug and plug the power cord. Plug the power cord, wait for 10 sec. or more, and turn ON the main
power switch.
2. Check the connectors of the DFCB for proper connection and correct as necessary.
3. Rewrite the firmware.
4. Replace DFCB.

Code: C8402
Description: Multi feed detection board failure (When UK-P19 is installed)
When the main power switch ON or when the original is being conveyed, the AD value there is no paper loaded state is out of the predetermined range.
Causes: • Multi feed detection board/TX (MFDB/TX)
• Multi feed detection board/RX (MFDB/RX)
• DF control board (DFCB)
Troubleshooting Guides: 1. Check the connector between MFDB/TX CN111-relay CN114-DFCB CN1 for proper connection and correct as necessary.
2. Check the connector between MFDB/RX CN110-relay CN115-DFCB CN1 for proper connection and correct as necessary.
3. MFDB/TX operation check
• Control signal: DFCB CN1-6
• Location of electrical component: 23-X
4. MFDB/RX operation check
• Control signal: DFCB CN1-3
• Location of electrical component: 23-X
5. MFDB/TX ICP1 conduction check
6. Replace MFDB/TX.
7. Replace MFDB/RX.
8. Replace DFCB.

Code: C8403
Description: Initial data failure
No initial data available for the shading repair function is stored in the storage board (STRGB) and the CPU board (CPUB).
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Select [Service Mode] -> [ADF] -> [Shading Repair] -> [Init. Data Input] and perform the function.
2. Check STRGB for proper installation and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace STRGB.
5. Replace CPUB.
6. Replace BASEB.

Code: C9401
Description: CIS LED lighting failure (front side)
At the CIS gain adjustment, the machine detected that the output of the CIS LED is lower than the specified value.
Causes: • Flat cable
• CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the flat cable.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: C9402
Description: CIS LED lighting abnormally (front side)
The average output value of the CIS LED with the scanner at its standby position is a predetermined value or more at the end of a scan job.
Causes: • Flat cable
• CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the flat cable.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: C9403
Description: CIS LED lighting failure (back side)
At the CIS gain adjustment, the machine detected that the output of the CIS LED is lower than the specified value.
Causes: • Flat cable
• DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the flat cable.
4. Replace the DF CIS module assy.
5. Replace CPUB.
6. Replace BASEB.

Code: C9404
Description: CIS LED lighting abnormally (back side)
After a scan job is completed, the machine detected that the average output of the CIS LED is greater than the specified value.
Causes: • Flat cable
• DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the flat cable.
4. Replace the DF CIS module assy.
5. Replace CPUB.
6. Replace BASEB.

Code: C9701
Description: Front side reading device cable break detection
The cable between the CIS module (IR CIS) and the base board (BASEB) is break.
Causes: • Flat cable
• CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the flat cable.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: C9702
Description: Back side reading device cable break detection
The cable between the DF CIS module (DF CIS) and the base board (BASEB) is break.
Causes: • Flat cable
• DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the flat cable.
4. Replace the DF CIS module assy.
5. Replace CPUB.
6. Replace BASEB.

Code: CA051
Description: Standard controller configuration failure
The controller of the CPU board (CPUB) is faulty.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CA052
Description: Controller hardware error
A controller hardware error is detected in the network interface.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CA053
Description: Controller start failure
A controller start failure is detected in the controller interface.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CC002
Description: Vendor internal error
Error occurs inside the vendor.
Causes: • Vendor
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power
switch.
2. Check the connector between the vendor-BASEB CN30E for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace CPUB.
5. Replace BASEB.
6. Replace the vendor.

Code: CC151
Description: ROM contents error upon startup (MSC)
A fault is detected in a sequence of ROM contents check of the CPU board (CPUB) during starting.
Causes: • Backup board (ERB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the ROM version.
2. Rewrite the firmware.
3. Check the connector between ERB CN1-BASEB CN20E for proper connection and correct as necessary.
4. Check CPUB for proper installation and correct as necessary.
5. Replace ERB.
1. Replace the current ERB with a new one.
2. Replace the following components with new ones.
When the transfer belt unit, transfer roller and the fusing unit have been replaced with new ones, carry out the [Service Mode] -> [Counter] –
> [Life] -> [New Release].
• Imaging unit
• Transfer belt unit
• Fusing unit
• Transfer roller
• Feed roller, pick-up roller, separation roller (including options)
• Separation pad
• Toner filter
3. Turn ON the main power switch and check to see that warm-up is started.
Make sure that malfunction codes other than C2650 or improper IU/TC placement is not detected.
4. Set the various setting values again.
6. Replace CPUB.
7. Replace BASEB.

Code: CC152
Description: ROM contents error upon startup (IR)
A fault is detected in a sequence of ROM contents check of the CPU board (CPUB) during starting.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the ROM version.
2. Rewrite the firmware.
3. Check CPUB for proper installation and correct as necessary.
4. Replace CPUB.
5. Replace BASEB.

Code: CC156
Description: DF ROM error
Upgrade of the firmware has not been successful.
Causes: DF control board (DFCB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Rewrite the firmware.
3. Replace DFCB.

Code: CC163
Description: ROM contents error (PRT)
The wrong model of firmware is detected in the engine during the initial connection to the engine is being checked.
Causes: • Backup board (ERB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Rewrite the firmware.
2. Replace CPUB.
NOTE
▪ When taking the above steps, check whether CPUB is defective or not without replacing the ERB.
a. Turn OFF the main power switch and replace the current CPUB with a new one.
b. Update the firmware.
c. After completing the firmware update, turn OFF and ON the main power switch and check to see that warm-up is started.
d. When the trouble cannot be solved, reinstall the removed CPUB to the original board.
3. Replace BASEB.
4. If the above actions do not solve the problem, contact KM.

Code: CC164
Description: ROM contents error (MSC)
• The wrong model of firmware is detected in the CPU board when the main power switch is turned ON.
• The machine type information (Machine, Type) registered to the machine differs from the actual machine
type.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the ROM version.
2. Check the machine type information registered and reenter as necessary.
For details the machine information, see “Entering the machine type information”.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace STRGB.
6. Replace BASEB.
7. If the above actions do not solve the problem, contact KM.

Code: CC170 … CC186
Description: • CC170: Dynamic link error during starting (AP0)
• CC171: Dynamic link error during starting (AP1)
• CC172: Dynamic link error during starting (AP2)
• CC173: Dynamic link error during starting (AP3)
• CC174: Dynamic link error during starting (AP4)
• CC180: Dynamic link error during starting (LDR)
• CC181: Dynamic link error during starting (IBR)
• CC182: Dynamic link error during starting (IID)
• CC183: Dynamic link error during starting (IPF)
• CC184: Dynamic link error during starting (IMY)
• CC185: Dynamic link error during starting (SPF)
• CC186: Dynamic link error during starting (OAP)
A dynamic link error occurs in the program on the CPU board due to an insufficient memory space available, a ROM fault, or other reason when the main power switch is turned ON.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. If the trouble code ‘C-C180’ has occurred, check to install the appropriate loadable device driver for an authentication unit which is installed to the MFP. When the appropriate loadable device driver is not installed, reinstall the appropriate loadable device driver.
2. Check CPUB for proper installation and correct as necessary.
3. Replace CPUB.
4. Replace BASEB.
5. If the above actions do not solve the problem, contact KM.

Code: CC190
Description: Outline font load error
An error occurred while loading the outline font.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check STRGB for proper installation and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] and perform the function.
4. Replace STRGB.
5. Replace CPUB.
6. Replace BASEB.

Code: CC191
Description: Setting parameter load error (LDR)
Upon startup, the processing of the loadable device driver setting data file failed.
• RAM disk file creation failed.
• Reading from the flash ROM failed.
• An error occurred in API of the authentication module.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch, wait for 10 sec., then turn the switch ON.
2. Check CPUB for proper installation and correct as necessary.
3. Reinstall the loadable device driver.
4. Rewrite the firmware.
5. Replace CPUB.
6. Replace BASEB.

Code: CC211
Description: Authentication device general error
When using the authentication device, authentication data is not to meet the specifications.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• Authentication unit
Troubleshooting Guides: 1. Check the USB cable for proper connection. Reconnect the USB cable as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Turn OFF the main power switch, wait for 10 sec. or more, and turn ON the main power switch.

Code: CC212
Description: User validation error
• An error occurred while validating the user authentication information.
• The loadable device driver is not successfully installed.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• Authentication unit
Troubleshooting Guides: 1. When this trouble code is generated after installing the loadable device driver, check to see if there is any file other than loadable device driver in USB memory used. If there is any file, reinstall the loadable device driver.
2. Check the USB cable for proper connection. Reconnect the USB cable as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Turn OFF the main power switch, wait for 10 sec. or more, and turn ON the main power switch.
5. Re-register the user authentication information.
6. Replace the authentication unit.

Code: CC213
Description: User registration error/Card information setting error
• IC card advanced settings data is not correct when starting-up the authentication device.
• Authentication information data is not correct when starting-up the authentication device.
• IC card advanced settings data is not correct when setting the IC card advanced settings.
• Authentication information data is not correct when setting the IC card advanced settings.
• IC card advanced settings data is not correct when registering the authentication information.
• Authentication information data is not correct when registering the authentication information.
• IC card advanced settings data is not correct when editing the authentication information.
• Authentication information data is not correct when editing the authentication information.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• Authentication unit
Troubleshooting Guides: 1. Check the USB cable for proper connection. Reconnect the USB cable as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Turn OFF the main power switch, wait for 10 sec. or more, and turn ON the main power switch.
4. Reset the authentication settings. (card type, IC card advanced settings, and etc.)
5. Re-register the user authentication information.

Code: CC214
Description: User information deletion error
The deletion of the user information is uncompleted.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• Authentication unit
Troubleshooting Guides: 1. Check the USB cable for proper connection. Reconnect the USB cable as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Turn OFF the main power switch, wait for 10 sec. or more, and turn ON the main power switch.

Code: CC216
Description: Acquisition failure of the number of trials/Initialize error of number of authentication
An error occurred during user authentication using optional authentication unit AU-102.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• Authentication unit
Troubleshooting Guides: 1. Check the USB cable for proper connection. Reconnect the USB cable as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Turn OFF the main power switch, wait for 10 sec. or more, and turn ON the main power switch.
4. Reset the number of authentication trials.

Code: CC301
Description: Authentication customize data error
• The master authentication customize data is corrupted upon startup.
• Registration of authentication customize data in the main body has failed upon startup.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• Authentication unit
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Reinstall the authentication customize data.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace BASEB.

Code: CC302
Description: Authentication customize data version mismatch error
The authentication customize data version is later than the firmware version of the machine.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• Authentication unit
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Rewrite the main body firmware with the latest one and reinstall the authentication customize data.
3. Replace CPUB.
4. Replace BASEB.

Code: CCC00
Description: Public user account track information error
At the first time of startup, the nonvolatile status is reset incompletely due to any trouble (such as a shut off of the main power).
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Replace STRGB.
2. Replace CPUB.
3. Replace BASEB.

Code: CD002
Description: JOB RAM save error
The error in save of job data to the memory / storage and its read error are detected.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check STRGB for proper installation and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Logical Format] and perform the function.
4. Replace STRGB.
5. Replace CPUB.
6. Replace BASEB.

Code: CD004
Description: Storage access error (connection failure)
Unable to communicate between the storage and CPU board (CPUB).
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check STRGB for proper installation and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace STRGB.
4. Replace CPUB.
5. Replace BASEB.

Code: CD00F
Description: Storage data transfer error
Data transfer from the storage is faulty.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check STRGB for proper installation and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace STRGB.
4. Replace CPUB.
5. Replace BASEB.

Code: CD010
Description: Storage unformat
Unformatted storage is connected.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check STRGB for proper installation and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] and perform the function.
4. Replace STRGB.
5. Replace CPUB.
6. Replace BASEB.

Code: CD011
Description: Storage out of specifications mounted
A storage that falls outside the specifications is connected.
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Check the storage specifications.
2. Replace STRGB.

Code: CD012
Description: Mount error due to storage being unformatted
• The storage is not logically formatted after the whole data in the storage has been deleted by overwriting.
• The storage that has replaced an old one is not logically formatted.
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Logical Format] and perform the function. Then, rewrite the firmware.
2. Replace STRGB.

Code: CD030
Description: Storage management information reading error
The machine fails to read administrative information data saved in the storage.
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Check STRGB for proper installation and correct as necessary.
2. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Logical Format] and perform the function.
3. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Physical Format] and perform the function.
4. Replace STRGB.

Code: CD041 … CD046
Description: CD041, CD042, CD043, CD044, CD045, CD046: Storage command execution error
The error occurred inside the storage.
Causes: Storage board (STRGB)
Troubleshooting Guides: Procedure
1. Check the storage specifications.
2. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] and perform the function.
3. Replace STRGB.

Code: CD047 … CD04B
Description: CD047, CD048, CD049, CD04A, CD04B: Storage SCSI library error
The error occurred inside the storage.
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Check the storage specifications.
2. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] and perform the function.
3. Replace STRGB.

Code: CD050
Description: Storage recovery timeout
The storage fails to recover from the power save mode within the predetermined period of time.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check STRGB for proper installation and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] and perform the function.
4. Replace STRGB.

Code: CD072
Description: Second-hand storage or second-hand CPU board installed
The storage board (STRGB) or CPU board (CPUB) used on other MFPs is installed.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
Troubleshooting Guides: 1. Replace the board with the new STRGB and CPUB. Or, reuse the original STRGB and CPUB.

Code: CD073
Description: Storage type is different
When the installed storage and the configured storage are different.
Causes: • Storage board (STRGB)
• microSD
Troubleshooting Guides: 1. Check the storage type settings and correct if the wrong storage is set.

Code: CD110
Description: Wireless LAN destination initialization error
When an initialization error occurred on the settings of the wireless LAN in the upgrade kit (UK-221).
Causes:
Troubleshooting Guides: 1. Check the UK-221 connector for proper connection and correct as necessary.
2. Rewrite the firmware.
3. Replace UK-221.

Code: CD201
Description: File memory mounting error
• The file memory is not mounted.
• The file has any abnormality.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CD202
Description: Memory capacity discrepancy
• File memory capacity on the CPU board (CPUB) is not enough.
• File memory capacity necessary for duplex printing is not enough.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CD203
Description: Memory capacity discrepancy 2
File memory capacity on the CPU board (CPUB) is not enough.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CD211
Description: PCI-SDRAM DMA operation failure
Hardware related to the transfer of memory image of the CPU board (CPUB) fails to respond.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CD212
Description: Compression/extraction timeout detection
Hardware related to the BTC compression function of the CPU board (CPUB) fails to respond.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CD231
Description: The FAX board is mounted but not containing any FAX memory.
• The FAX board is mounted, but the FAX DIMM is not included.
• The FAX board is not mounted when it is set to mount setting at Service Mode.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• FAX board (FAXB)
Troubleshooting Guides: 1. Check the FAX board for proper installation and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace CPUB.
4. Replace BASEB.

Code: CD241
Description: Encryption ASIC setting error
Initialization error of the encrypted ASIC is detected during the machine is starting.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Check BASEB connector for proper connection and correct as necessary.
3. Replace CPUB.
4. Replace BASEB.

Code: CD242
Description: Encryption ASIC mounting error
The faulty of the installation of encrypted ASIC is detected during the machine is starting.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Check BASEB connector for proper connection and correct as necessary.
3. Replace CPUB.
4. Replace BASEB.

Code: CD251
Description: JpegASIC mounting error
The faulty of the installation of JpegASIC is detected during the machine is starting. The FAX board is not mounted when it is set to mount setting at Service Mode.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Check BASEB connector for proper connection and correct as necessary.
3. Replace CPUB.
4. Replace BASEB.

Code: CD261
Description: USB hub board failure
• When a failure is detected in USB hub board included in the local interface kit.
• Non-standard USB device is connected.
Causes: • CPU board (CPUB)
• Base board (BASEB)
• USB hub board (USBHB: EK-P08 or EK-P09)
Troubleshooting Guides: 1. Check the operation with another USB device.
2. Check USBHB for proper connection and correct as necessary.
3. Replace USBHB.
4. Replace CPUB.
5. Replace BASEB.

Code: CD262
Description: Extension network adapter installation error
• When the 2nd network card settings is set to “Set” but the upgrade kit (UK-221) is not installed.
• Upgrade Kit (UK-221) is faulty.
Causes:
Troubleshooting Guides: 1. Check the settings of [Service Mode] -> [Network Settings] -> [2nd Network Setting] -> [2nd network card settings].
2. Check the UK-221 connector for proper connection and correct as necessary.
3. Rewrite the firmware.
4. Replace UK-221.

Code: CD2A0
Description: 1 beam configuration error 1
• A combination error of the storage board and the main body is detected.
• A combination error of the base board and the main body is detected.
Causes:
Troubleshooting Guides: 1. Update the firmware.

Code: CD2A1
Description: 1 beam configuration error 2
• A combination error of the storage board and the main body is detected.
• A combination error of the base board and the main body is detected.
Causes:
Troubleshooting Guides: 1. Reboot the machine.

Code: CD2D1
Description: VLAN setting configuration error
At start up of the MFP, the reception condition of VLAN setting activation is not satisfied.
Causes: • Storage board (STRGB)
• Backup board (ERB)
Troubleshooting Guides: 1. Check if all VLAN setting reception conditions are satisfied.
• If the IC card reader is connected, the LDD of AU-201S has been installed.
• The software SW12 (bit1) has been set to ‘PKI unsupported’ (0x00). (PKI mode setting unavailable)
• Service Mode -> [Billing Setting] -> [Management Function Choice] is set to ‘Unset’.
• ‘TCP/IP” of Utility -> [Administrator] -> [Network] -> [TCP/IP Setting] -> [TCP/IP Setting1] is set to ‘ON”.
• ‘Network I/F Configuration” of Utility -> [Administrator] -> [Network] -> [Network I/F Configuration] is set to other than ‘Wireless Only”.

Code: CD313
Description: TPM key data error
A fault occurs in the TPM key data.
Causes:
Troubleshooting Guides: 1. Touch [Recover Data] displayed at the lower right portion on the trouble screen.
2. A screen confirming whether to recover data appears.
3. Select [Yes].
4. The screen will be shifted to the data restoration screen to perform data restoration.
NOTE
▪ When the restoration is performed in a short time, data restoration screen may not be displayed.
5. Check the message which indicates that the data restoration was successfully conducted. Turn OFF the main power switch and turn it ON again more than 10 seconds after.
NOTE
▪ In case it failed to restore data, return to the trouble code screen.
6. Replace the current TPMB with a new one.
7. Replace the current CPUB with a new one.
8. Replace the current BASEB with a new one.
NOTE
▪ Nonvolatile data backup will be automatically performed every hour. Backup can also be performed manually with the following setting. [Service Mode] -> [Enhanced Security] -> [Memory Data Backup]

Code: CD38E
Description: Nonvolatile data save error (SPI-Flash)
The ‘ISW download flag’ saved in the SPI-Flash has an illegal value.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Rewrite the firmware.
2. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.

Code: CD390
Description: Nonvolatile data checksum error
C-D390 code is normally shown when the CPU board (CPUB) is replaced with a new one.
Causes:
Troubleshooting Guides: 1. Wait until “Recover Data” appears. (MFP will reboot maximum 2 times by itself, it may take 5 minutes.) Touch the “Recover Data” button and follow the instructions that appear on the control panel to restore (backup) data.

Code: CD391
Description: Nonvolatile data save error (Storage)
Causes:
Troubleshooting Guides: NOTE
▪ Contact the responsible people of KM before taking some countermeasures.

Code: CD392
Description: Nonvolatile data save error (EEPROM)
The backup board (ERB) is replaced with a new one.
Causes: Backup board (ERB)
Troubleshooting Guides: 1. Replace the following components with new ones.
Configure [New Release] in Service Mode before replacing the image transfer belt unit, transfer roller and the fusing unit.
• Imaging unit
• Transfer belt unit
• Fusing unit
• Transfer roller
• Feed roller, pick-up roller, separation roller (including options)
• Separation pad
• Toner filter
2. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power
switch.
3. Set the various setting values in the service mode again.
4. If the above actions do not solve the problem, contact KM.

Code: CD3B1 … CD3B5
Description: • CD3B1: DB server startup failure
• CD3B3: DB access failure
• CD3B4: No DB definition file
• CD3B5: DB definition file error
• CD3B1: When starting the MFP, PostgreSQL server startup has not been successful.
• CD3B3: When starting the MFP, SQL DB access fails in PostgreSQL server startup processing.
• CD3B4: When starting the MFP, SQL DB definition file does not exist in PostgreSQL server startup processing.
• CD3B5: When starting the MFP, there is an error in SQL DB definition file in PostgreSQL server startup processing.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check CPUB for proper installation and correct as necessary.
2. Rewrite the firmware.
3. Replace CPUB.
4. Replace BASEB.

Code: CD3C0
Description: New board detection
The board is replaced with a new one.
Causes:
Troubleshooting Guides: 1. Wait until “Recover Data” appears. (MFP will reboot maximum 2 times by itself, it may take 5 minutes.) Touch the “Recover Data” button and follow the instructions that appear on the control panel to restore (backup) data.

Code: CD401 … CD413
Description: • CD401: NACK command incorrect
• CD402: ACK command incorrect
• CD403: Checksum error
• CD404: Receiving packet incorrect
• CD405: Receiving packet analysis error
• CD406: ACK receiving timeout
• CD407: Retransmission timeout
• CD411: Touch panel board error
• CD412: Touch panel type mismatch
• CD413: Electrostatic touch panel operation mode error
When abnormality is found in the communication of controller.
Causes: • Control panel
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check whether there is a strong electromagnetic noise source near the main body.
2. Check the connector between the control panel-BASEB CN7 for proper connection and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Replace CPUB.
5. Replace BASEB.

Code: CD601, CD602, CD603
Description: Trouble related to security
Causes:
Troubleshooting Guides: 1. Turn OFF the main power switch, wait for 10 sec. or more, and turn ON the main power switch. If the above actions do not solve the problem, contact KM.

Code: CD701
Description: Mechanical controller flash ROM writing error
A mechanical controller flash ROM writing sequence is interrupted in its mid-operation due to, for example, power being shut off.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace BASEB.

Code: CD702
Description: Mechanical controller flash ROM device error
An erase error or other device fault occurs during mechanical controller flash ROM writing.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace BASEB.

Code: CD703
Description: FW download communication fault
Irregular data is received during FW downloading.
• Places are changed in the order of write completion pulses.
• A write completion pulse is received for a memory for which binary writing is not permitted.
• Final checksum mismatch in FW download
• Two-minute timeout (no response from CTL, the number of transfer data items less than the specified)
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace CPUB.
5. Replace BASEB.

Code: CDF50
Description: ASIC image version failure
Communication error is detected between the CPU board (CPUB) and the CIS module (IR CIS).
Causes: • CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: CDF51
Description: ASIC image version failure (back side)
Communication error is detected between the CPU board (CPUB) and the DF CIS module (DF CIS).
Causes: • DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace the DF CIS module assy.
5. Replace CPUB.
6. Replace BASEB.

Code: CDF70
Description: ASIC image access failure
Communication error is detected between the CPU board (CPUB) and the CIS module (IR CIS).
Causes: • CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: CDF71
Description: ASIC image access failure (back side)
Communication error is detected between the CPU board (CPUB) and the DF CIS module (DF CIS).
Causes: • DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace the DF CIS module assy.
5. Replace CPUB.
6. Replace BASEB.

Code: CDFA0
Description: ASIC image error
Communication error is detected between the CPU board (CPUB) and the CIS module (IR CIS).
Causes: • CIS module (IR CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace IR CIS.
5. Replace CPUB.
6. Replace BASEB.

Code: CDFA1
Description: ASIC image error (back side)
Communication error is detected between the CPU board (CPUB) and the DF CIS module (DF CIS).
Causes: • DF CIS module (DF CIS)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Rewrite the firmware.
4. Replace the DF CIS module assy.
5. Replace CPUB.
6. Replace BASEB.

Code: CE001 … CE011
Description: • CE001: Abnormal message queue
• CE003: Task error
• CE004: Event error
• CE005: Memory access error
• CE006: Header access error
• CE007: DIMM initialize error
• CE009: Memory resource shortage error
• CE011: Config. file access error at startup of FW
CPU board (CPUB) is faulty.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CE002
Description: Message and method parameter failure
CPU board (CPUB) is faulty.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and turn it ON again, and conduct the following setting. [Service Mode] -> [System 1] -> [Initialization] -> [Clear All Data].
2. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] and perform the function.
3. Replace STRGB.
4. Replace CPUB.
5. Replace BASEB.

Code: CE012
Description: Failed to receive the entropy from Haveged
Receiving the entropy from Haveged is failed.
Causes:
Troubleshooting Guides: 1. Reboot the machine.

Code: CE013
Description: Virus scan engine startup failure (8 GB storage)
When the virus scan settings are effective, change from storage board (STRGB) to microSD (8GB).
Causes: microSD
Troubleshooting Guides: 1. Reboot the machine.
2. Disable virus scan setting.
3. Remove the microSD, and replace the STRGB.

Code: CE014
Description: Virus scan engine startup failure (storage error)
The file or data that is necessary to start the virus scan has been lost.
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Reboot the machine. (MFP will reboot maximum 2 times by itself.)
2. Replace STRGB.

Code: CE015
Description: Secret information issue error (for WebUIv2)
Detected when issuing secret information fails.
Causes:
Troubleshooting Guides: 1. Turn OFF and ON the main power switch.

Code: CE101
Description: Browser finish detected
• The browser is automatically recovered (restarted) after the main body detected that the browser (separate process) has stopped with fault.
• When the “Malfunction finish is detected over predetermined number of times” or “the browser task process is except in idle (printing, etc.)”.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CE201
Description: Transmission operation log storage fault
When the transmission log storage failed, it repeats retrial until transmission operation log is stored. The trouble is detected when the retrial failed for predetermined number of times.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CE202
Description: PDL interpreter error
An error inside the CPU board (CPUB) is detected during converting the PDL information.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Logical Format] and perform the function.
3. Select [System 1] -> [Initialization] -> [Clear All Data] and perform the function.
4. Replace CPUB.
5. Replace BASEB.

Code: CE203
Description: Unrecoverable error
An error does not recover even after an auto recovery.
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Logical Format] and perform the function.
3. Select [System 1] -> [Initialization] -> [Clear All Data] and perform the function.
4. Update the firmware.
5. Perform the self-diagnostic function.
6. Replace CPUB.
7. Replace BASEB.

Code: CE204
Description: SIP / T.38 library loading failure
Installed an illegal library of SIP/T.38.
Causes:
Troubleshooting Guides: 1. Install a legal library of LK-117.

Code: CE301 … CE305
Description: • CE301: Referring incorrect memory
• CE302: Incorrect command
• CE303: Finished due to error inside Qt library
• CE304: Finished due to error outside Qt library
• CE305: Program forced to stop
Causes: • The disabling operation is detected due to an abnormal control sequence in firmware processing (program) controls the MFP controller.
• In most cases, the disabling operation is due to an abnormality in the control sequence under a specific condition or timing.
Troubleshooting Guides: 1. Execute the “Self-diag. (Full)”. For details, see “TROUBLESHOOTING USING SELF-DIAG. (FULL)”.
2. If the diagnosis result of “Self-diag. (Full)” is OK, the hardware part is not the cause of trouble. So, acquire the “Machine Management List” and contact KM with that information. For details, see “List Output”.

Code: CED01
Description: The authentication application information does not exist in the storage in the enhanced server authentication state.
With “Enhanced Server Authentication” set, no authentication application registration information is found in the storage.
Causes: • Storage board (STRGB)
• CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF and ON the main power switch.
2. Check STRGB for proper installation and correct as necessary.
3. Check CPUB for proper installation and correct as necessary.
4. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Logical Format] and perform the function.
5. Replace STRGB.
6. If the above actions do not solve the problem, contact KM.

Code: CEEE1, CEEE3
Description: • CEEE1: CPU board (MSC) malfunction
• CEEE3: Base board (ENG) malfunction
Causes: • CPU board (CPUB)
• Base board (BASEB)
Troubleshooting Guides: 1. Check the connectors on BASEB for proper connection and correct as necessary.
2. Replace CPUB.
3. Replace BASEB.

Code: CEEE2
Description: Scanner section malfunction
A scanner part is faulty.
Causes: CIS module (IR CIS)
Troubleshooting Guides: 1. Replace IR CIS.

Code: CFA##
Description: Abort code
• The disabling operation is detected due to an abnormal control sequence in firmware processing (program) controls the MFP controller.
• In most cases, the disabling operation is due to an abnormality in the control sequence under a specific condition or timing.
Causes:
Troubleshooting Guides: 1. Execute the “Self-diag. (Full)”. For details, see “TROUBLESHOOTING USING SELF-DIAG. (FULL)”.
2. If the diagnosis result of “Self-diag. (Full)” is OK, the hardware part is not the cause of trouble. So, acquire the “Machine Management List” and contact KM with that information. For details, see “List Output”.

Code: CFB##
Description: Abort code
• The disabling operation is detected due to an abnormal control sequence in firmware processing (program) controls the MFP controller.
• In most cases, the disabling operation is due to an abnormality in the control sequence under a specific condition or timing.
Causes:
Troubleshooting Guides: 1. Execute the “Self-diag. (Full)”. For details, see “TROUBLESHOOTING USING SELF-DIAG. (FULL)”.
2. If the diagnosis result of “Self-diag. (Full)” is OK, the hardware part is not the cause of trouble. So, acquire the “Machine Management List” and contact KM with that information. For details, see “List Output”.

Code: CFC##
Description: Abort code
• The disabling operation is detected due to an abnormal control sequence in firmware processing (program) controls the MFP controller.
• In most cases, the disabling operation is due to an abnormality in the control sequence under a specific condition or timing.
Causes:
Troubleshooting Guides: 1. Execute the “Self-diag. (Full)”. For details, see “TROUBLESHOOTING USING SELF-DIAG. (FULL)”.
2. If the diagnosis result of “Self-diag. (Full)” is OK, the hardware part is not the cause of trouble. So, acquire the “Machine Management List” and contact KM with that information. For details, see “List Output”.

Code: CFD##
Description: Abort code
• The disabling operation is detected due to an abnormal control sequence in firmware processing (program) controls the MFP controller.
• In most cases, the disabling operation is due to an abnormality in the control sequence under a specific condition or timing.
Causes:
Troubleshooting Guides: 1. Execute the “Self-diag. (Full)”. For details, see “TROUBLESHOOTING USING SELF-DIAG. (FULL)”.
2. If the diagnosis result of “Self-diag. (Full)” is OK, the hardware part is not the cause of trouble. So, acquire the “Machine Management List” and contact KM with that information. For details, see “List Output”.

Code: CFE##
Description: Abort code
• The disabling operation is detected due to an abnormal control sequence in firmware processing (program) controls the MFP controller.
• In most cases, the disabling operation is due to an abnormality in the control sequence under a specific condition or timing.
Causes:
Troubleshooting Guides: 1. Execute the “Self-diag. (Full)”. For details, see “TROUBLESHOOTING USING SELF-DIAG. (FULL)”.
2. If the diagnosis result of “Self-diag. (Full)” is OK, the hardware part is not the cause of trouble. So, acquire the “Machine Management List” and contact KM with that information. For details, see “List Output”.

Code: CFF##
Description: Abort code
• The disabling operation is detected due to an abnormal control sequence in firmware processing (program) controls the MFP controller.
• In most cases, the disabling operation is due to an abnormality in the control sequence under a specific condition or timing.
Causes:
Troubleshooting Guides: 1. Execute the “Self-diag. (Full)”. For details, see “TROUBLESHOOTING USING SELF-DIAG. (FULL)”.
2. If the diagnosis result of “Self-diag. (Full)” is OK, the hardware part is not the cause of trouble. So, acquire the “Machine Management List” and contact KM with that information. For details, see “List Output”.

Code: E1-1
Description: Engagement failure
Mounting failure
Causes: Storage board (STRGB)
CPU board (CPUB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of STRGB if faulty.
3. Correct the mounting of CPUB if faulty.
4. Replace STRGB.
5. Replace CPUB

Code: E1-2
Description: STRGB error (data failure)
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of STRGB if faulty.
3. Replace STRGB.

Code: E1-3
Description: STRGB error (data failure)
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of STRGB if faulty.
3. Replace STRGB.

Code: E1-4
Description: STRGB error (data failure)
Causes: MFP firmware
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Perform re-installation of the firmware.

Code: E1-5
Description: STRGB error (data failure)
Causes: Storage board (STRGB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of STRGB if faulty.
3. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Format] -> [Logical Format] and perform the function.
4. Replace STRGB.

Code: E11-1, E11-2
Description: S800 error
Causes: CPU board (CPUB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of CPUB if faulty.
3. Replace CPUB.

Code: E12-1, E12-2
Description: PCIe device check IRIS
Causes: CPU board (CPUB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of CPUB if faulty.
3. Replace CPUB.

Code: E12-3
Description: PCIe device error
Causes: Storage board (STRGB)
CPU board (CPUB
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of STRGB if faulty.
3. Correct the mounting of CPUB if faulty.
4. Replace STRGB.
5. Replace CPUB.

Code: E3-1
Description: Connection failure
Parts defect
Causes: TPM board (TPMB)
CPU board (CPUB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of TPMB if faulty.
3. Correct the mounting of CPUB if faulty.
4. Correct the mounting of BASEB or the connection of connectors if faulty.
5. Replace TPMB.
6. Replace CPUB.
7. Replace BASEB.

Code: E3-2
Description: Connection failure
Parts defect
Causes: CPU board (CPUB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of CPUB if faulty.
3. Correct the mounting of BASEB or the connection of connectors if faulty.
4. Replace CPUB.
5. Replace BASEB.

Code: E3-3
Description: Connection failure
Parts defect
Causes: CPU board (CPUB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of CPUB if faulty.
3. Correct the mounting of BASEB or the connection of connectors if faulty.
4. Replace CPUB.
5. Replace BASEB.

Code: E4-1, E4-2
Description: Engagement failure
Mounting failure
DRAM failure
NOTE
▪ When executing the Self-diag. (Full) after the trouble code (CE301, CE304) is displayed, the self-diagnosis may not complete. In that case, finish the Self-diag. (Full) forcibly, and perform the troubleshooting against each trouble code.
▪ Turning OFF the main power switch will finish the Self-diag. (Full) forcibly.
Causes: CPU board (CPUB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of CPUB if faulty.
3. Replace CPUB.

Code: E5-1
Description: Connection failure
Parts defect
Causes: CPU board (CPUB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of CPUB if faulty.
3. Replace CPUB.

Code: E5-11
Description: Connection failure
Parts defect
Causes: Wireless LAN board (WLANB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of the upgrade kit (UK-221) or the connection of connectors if faulty.
3. Correct the mounting of BASEB or the connection of connectors if faulty.
4. Replace WLANB.
5. Replace BASEB.

Code: E5-12
Description: Connection failure
Parts defect
Causes: Authentication unit
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting and connection of the authentication unit if faulty.
3. Correct the mounting of BASEB or the connection of connectors if faulty.
4. Replace the authentication unit.
5. Replace BASEB.

Code: E5-2
Description: Connection failure
Parts defect
Causes: CPU board (CPUB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of CPUB if faulty.
3. Correct the mounting of BASEB or the connection of connectors if faulty.
4. Replace CPUB.
5. Replace BASEB.

Code: E5-3
Description: Connection failure
Parts defect
Causes: Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of BASEB or the connection of connectors if faulty.
3. Replace BASEB.

Code: E5-4
Description: Connection failure
Parts defect
Causes: USB hub board (USBHB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of USBHB or the connection of connectors if faulty.
3. Correct the mounting of BASEB or the connection of connectors if faulty.
4. Replace USBHB.
5. Replace BASEB.

Code: E5-5
Description: Connection failure
Parts defect
Causes: USB hub board (USBHB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of USBHB or the connection of connectors if faulty.
3. Replace USBHB.

Code: E5-7
Description: Connection failure
Parts defect
Causes: FAX board (FAXB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of the FAX board or the connection of connectors if faulty.
3. Correct the mounting of BASEB or the connection of connectors if faulty.
4. Replace the FAX board.
5. Replace BASEB.

Code: E6-1
Description: Image bus failure
NOTE
▪ When executing the Self-diag. (Full) after the trouble code (C6###, C91##) is displayed, the self-diagnosis may not complete. In that case, finish the Self-diag. (Full) forcibly, and perform the troubleshooting against each trouble code.
▪ Turning OFF the main power switch will finish the Self-diag. (Full) forcibly.
Causes: CIS cable
CIS module (IR CIS)
CPU board (CPUB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of IR CIS or the CIS cable if faulty.
3. Correct the mounting of CPUB if faulty.
4. Correct the mounting of BASEB or the connection of connectors if faulty.
5. Replace the CIS cable.
6. Replace IR CIS.
7. Replace CPUB.
8. Replace BASEB.

Code: E6-2
Description: CIS sensor failure
NOTE
▪ When executing the Self-diag. (Full) after the trouble code (C6###, C91##) is displayed, the self-diagnosis may not complete. In that case, finish the Self-diag. (Full) forcibly, and perform the troubleshooting against each trouble code.
▪ Turning OFF the main power switch will finish the Self-diag. (Full) forcibly.
Causes: CIS module (IR CIS)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of IR CIS or the CIS cable if faulty.
3. Correct the mounting of CPUB if faulty.
4. Correct the mounting of BASEB or the connection of connectors if faulty.
5. Replace the CIS cable.
6. Replace IR CIS.
7. Replace CPUB.
8. Replace BASEB.

Code: E7-1
Description: Image bus failure
NOTE
▪ When executing the Self-diag. (Full) after the trouble code (C6###, C91##) is displayed, the self-diagnosis may not complete. In that case, finish the Self-diag. (Full) forcibly, and perform the troubleshooting against each trouble code.
▪ Turning OFF the main power switch will finish the Self-diag. (Full) forcibly.
Causes: CIS cable
DF CIS module (DF CIS)
CPU board (CPUB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of DF CIS or the CIS cable if faulty.
3. Correct the mounting of CPUB if faulty.
4. Correct the mounting of BASEB or the connection of connectors if faulty.
5. Replace the CIS cable.
6. Replace the DF CIS module assy.
7. Replace CPUB.
8. Replace BASEB.

Code: E7-2
Description: CIS sensor failure
NOTE
▪ When executing the Self-diag. (Full) after the trouble code (C6###, C91##) is displayed, the self-diagnosis may not complete. In that case, finish the Self-diag. (Full) forcibly, and perform the troubleshooting against each trouble code.
▪ Turning OFF the main power switch will finish the Self-diag. (Full) forcibly.
Causes: DF CIS module (DF CIS)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of DF CIS or the CIS cable if faulty.
3. Correct the mounting of CPUB if faulty.
4. Correct the mounting of BASEB or the connection of connectors if faulty.
5. Replace the CIS cable.
6. Replace the DF CIS module assy.
7. Replace CPUB.
8. Replace BASEB.

Code: E8-1
Description: ADF microcomputer communication failure
Causes: Connection cable
DF control board (DFCB)
CPU board (CPUB)
Base board (BASEB)
Troubleshooting Guides: 1. Turn OFF the main power switch and unplug the power cord. Connect the power cord after 10 sec. or more, and turn ON the main power switch.
2. Correct the mounting of DFCB or the connection of connectors if faulty.
3. Correct the mounting of CPUB if faulty.
4. Correct the mounting of BASEB or the connection of connectors if faulty.
5. Correct the connection of the connection cable if faulty.
6. Replace the connection cable.
7. Replace DFCB.
8. Replace CPUB.
9. Replace BASEB.

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[SOLVED] Quick fix Konica-Minolta 4750i list error codes