OKI C834dnw Error Codes list and solutions

OKI C834dnw Error Codes list and solutions

– Compatible Printer model: OKI C834dnw
– OKI C834dnw Error Code description:

• Code: 122, 127, 128, 918
• Description: FAN error
• Troubleshooting Guides: Duplex FAN does not drive during the Duplex printing.
  Cable connection condition and wiring condition of the Duplex FAN Check if the connectors are connected normally or not. Check if extra length of the cables does not touch the FAN blade or not. Correct the connection condition of the connectors. Correct the cable wiring route. Replace the FAN.
  24V fuse F501 of the Duplex board (GOH- 20 PCB) Check if the fuse F501 has blown out or not. Replace the Duplex board (GOH-20 PCB).
  24V power supplied to the Duplex board (GOH-20 PCB). Check if the fuse F21 of the CU/PU board has blown out or not. Replace the CU/ PU board.
  Low voltage power FAN, Fuser FAN, Belt FAN does not drive.
  Cable connection condition and wiring condition of the each FAN Check if the connectors are connected normally or not. Check if extra length of the cables does not touch the FAN blade or not. Correct the connection condition of the connectors. Correct the cable wiring route. Replace the FAN.
  24V power supply CU/PU board (ME2 PCB) fuse F25 Relay board fuse F1 Check if the fuse F25 of the CU/PU board is not open-circuit or not. Check if the fuse F1 of the relay board is not open-circuit or not. Replace the CU/ PU board or relay board. 24V power that is supplied to the CU/ PU board (ME2 PCB). Check the power supply voltages at the POWER connector 11 of the CU/PU board. The follow voltage must appear respectively. 3,5,6,7,8,10pin:24V 1,4,9,11,12,14pin:0VP Replace the low voltage power supply.
  ID motor FAN, Exit right FAN, Fuser blasting FAN, Fuser right side FAN does not drive.
  Cable connection condition and wiring condition of the each FAN Check if the connectors are connected normally or not. Check if extra length of the cables does not touch the FAN blade or not. Correct the connection condition of the connectors. Correct the cable wiring route. Replace the FAN.
  24V power supply CU/PU board fuse F24 Check if the fuse F24 of the CU/PU board is not open-circuit or not. Replace the CU/ PU board. 24V power that is supplied to the CU/ PU board. Check the power supply voltages at the POWER connector 11 of the CU/PU board. The follow voltage must appear respectively. 3,5,6,7,8,10pin:24V 1,4,9,11,12,14pin:0VP Replace the low voltage power supply.

• Code: 123
• Description: Humidity sensor error
• Troubleshooting Guides: Connection between the CU/PU board and the operator panel board Check if the 14-conductor FFC is connected to the OPE connector 22 of the CU/PU board properly. Check if the 14-conductor FFC is connected to the CN501 connector of the operator panel board properly. Check the connectors for half-way connection or angled connection. Re-connect the cable normally
  FFC connecting the CU/PU board and the operator panel board Check for open-circuit with VOM. Visually check that the sheath for peeling. Replace the FFC with a normal FFC.
  FFC connecting the CU/PU board and the environment sensor board Check for half-way connection, slanted angle insertion, and abnormal cables assembly. Check for open-circuit with VOM. Visually check that the sheath for peeling. Replace the FFC with a normal FFC.
  Environment condition
  Sharp change of environment condition Is the environment condition changed sharply from a low temperature environment to a high environment condition within a short time? (Example is such a case that the apparatus is moved from storage condition of a cold area in winter to an office environment.) Leave the apparatus to around one hour in the new environment to get used to the new environment. After that, turn on the power again. Before turn on the power, touch the metal panel of the controller panel and the metal plate inside the apparatus to feel temperature increase inside the apparatus with human hands. After confirmation that the apparatus temperature has increased close to the room temperature, turn on the power again.

• Code: 131, 132, 133, 134
• Description: LED HEAD Missing
• Troubleshooting Guides: Connecting condition at the CU/ PU board connector and at the head connector. Check the connecting condition of the FFC by the visual inspection. Correct the connection to the normal connecting condition.
  Head FFC Remove the head FFC from the apparatus. Check if any open-circuit or peeling-off of sheath has occurred or not throughout the cable. Replace the head FFC.
  Conduction of the fuse on the CU/PU board. Check that 5V is measured at the ends of the capacitors CP12 and CP13. Replace the CU/ PU board.

• Code: 136
• Description: Fuser unit error
• Troubleshooting Guides: Error occurs immediately after the power is turned on.
  NC sensor, lower thermistor, heater thermistor Check the respective thermistors if they are shorted or opened internally. Check the resistance value at the connector pins in the bottom of the fuser unit. (Refer to Resistance value (fuser unit) in chapter of ‘Other’ .) Replace the fuser unit.
  Installed condition of fuser unit. Check if the fuser nit is pressed in until the connector in the bottom of the fuser unit is completely connected. Re-set the fuser unit.
  Note! Service calls 171: Error and 175: Error probably occur when the apparatus temperature is below 0C. Turn on the power again after the temperature of the apparatus has increased.
  Error occurs approx. 1 minute after the power is turned on.
  Thermostat, heater Heater of the fuser unit is controlled of its temperature. Check if the fuser unit gets hot or not by touching it with hands. If the fuser unit temperature does not increase and remains cold, check that the resistance of the heater. (Refer to Resistance value check (fuser unit).) Replace the fuser unit.
  AC power voltage from the low voltage power supply Check if the AC voltage for heater is normally supplied or not. Power supply J2 connector 32, between pin-1 and pin-2, and between pin-3 and pin-4. Replace the low voltage power supply.
  Heater ON signal that is output from PU to the low voltage power supply Check that the heater ON signal goes active at the warming up timing, or not. ‘L’ active while ON. Power connector 11 of the CU/PU board, between pin-15, pin-16 and pin-18. Replace the CU/ PU board.
  Paper size Confirm whether paper size set to the cassette matches the setting. To match the setting of the paper size.
  Paper weight Confirm whether paper weight set to the cassette matches the setting. To match the setting of the media weight.

• Code: 142
• Description: ID unit Up/Down error
• Troubleshooting Guides: Error occurs during the Up movement of the ID unit
  Fuse of CU/PU board Check if the F23 is cutting or not. Replace the CU/ PU board.
  Mechanical load during installation and removal of the ID unit Check if abnormal heavy load is applied when removing the ID unit. Replace the ID unit, or replace the right/left side plate.
  Lubricating to the right and left Up/ Down link levers Check if the sloping surface of the link lever is lubricated or not. Lubricate to there.
  Assembled condition of the right and left Up/Down link levers Check if any part exists or not in the vicinity of link lever, that hampers movement of the link lever. Assemble them correctly.
  of the peripheral mechanism of the link lever Is the mechanism assembled so that the link lever is connected to the driving gear? Assemble them correctly.
  levers Check if the link lever is set in the correct position that enables the specified engagement of gears. (Check if the link lever is set in the wrong position that results in the wrong engagement of gears by several teeth.) Assemble them correctly.
  Up/Down sensor lever (unified structure with the left link lever) Check if shape and movement of the sensor levers is normality or not. Replace the left link lever.
  Up/Down sensor Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Check if the SCAN state changes or not when the incoming light is interrupted/passed by using a piece of paper or the like for the transparent type sensor. Replace the high voltage board.
  Error occurs during the Down movement of the ID unit
  Fuse of CU/PU board Check if the F23 is cutting or not. Replace the CU/ PU board.
  Mechanical load during installation and removal of the ID unit Check if abnormal heavy load is applied when removing the ID unit. Replace the ID unit, or replace the right/left side plate.
  Lubricating to the right and left Up/ Down link levers Check if the sloping surface of the link lever is lubricated or not. Lubricate to there.
  Assembled condition of the right and left Up/Down link levers Check if any part exists or not in the vicinity of link lever, that hampers movement of the link lever. Assemble them correctly.

• Code: 167 … 177
• Description: Fuser unit error
• Troubleshooting Guides: Error occurs immediately after the power is turned on.
  NC sensor, lower thermistor, heater thermistor Check the respective thermistors if they are shorted or opened internally. Check the resistance value at the connector pins in the bottom of the fuser unit. (Refer to Resistance value (fuser unit) in chapter of ‘Other’ .) Replace the fuser unit.
  Installed condition of fuser unit. Check if the fuser nit is pressed in until the connector in the bottom of the fuser unit is completely connected. Re-set the fuser unit.
  Note! Service calls 171: Error and 175: Error probably occur when the apparatus temperature is below 0C. Turn on the power again after the temperature of the apparatus has increased.
  Error occurs approx. 1 minute after the power is turned on.
  Thermostat, heater Heater of the fuser unit is controlled of its temperature. Check if the fuser unit gets hot or not by touching it with hands. If the fuser unit temperature does not increase and remains cold, check that the resistance of the heater. (Refer to Resistance value check (fuser unit).) Replace the fuser unit.
  AC power voltage from the low voltage power supply Check if the AC voltage for heater is normally supplied or not. Power supply J2 connector 32, between pin-1 and pin-2, and between pin-3 and pin-4. Replace the low voltage power supply.
  Heater ON signal that is output from PU to the low voltage power supply Check that the heater ON signal goes active at the warming up timing, or not. ‘L’ active while ON. Power connector 11 of the CU/PU board, between pin-15, pin-16 and pin-18. Replace the CU/ PU board.
  Paper size Confirm whether paper size set to the cassette matches the setting. To match the setting of the paper size.
  Paper weight Confirm whether paper weight set to the cassette matches the setting. To match the setting of the media weight.

• Code: 260 … 273
• Description: Fuser unit error
• Troubleshooting Guides: Error occurs immediately after the power is turned on.
  NC sensor, lower thermistor, heater thermistor Check the respective thermistors if they are shorted or opened internally. Check the resistance value at the connector pins in the bottom of the fuser unit. (Refer to Resistance value (fuser unit) in chapter of ‘Other’ .) Replace the fuser unit.
  Installed condition of fuser unit. Check if the fuser nit is pressed in until the connector in the bottom of the fuser unit is completely connected. Re-set the fuser unit.
  Note! Service calls 171: Error and 175: Error probably occur when the apparatus temperature is below 0C. Turn on the power again after the temperature of the apparatus has increased.
  Error occurs approx. 1 minute after the power is turned on.
  Thermostat, heater Heater of the fuser unit is controlled of its temperature. Check if the fuser unit gets hot or not by touching it with hands. If the fuser unit temperature does not increase and remains cold, check that the resistance of the heater. (Refer to Resistance value check (fuser unit).) Replace the fuser unit.
  AC power voltage from the low voltage power supply Check if the AC voltage for heater is normally supplied or not. Power supply J2 connector 32, between pin-1 and pin-2, and between pin-3 and pin-4. Replace the low voltage power supply.
  Heater ON signal that is output from PU to the low voltage power supply Check that the heater ON signal goes active at the warming up timing, or not. ‘L’ active while ON. Power connector 11 of the CU/PU board, between pin-15, pin-16 and pin-18. Replace the CU/ PU board.
  Paper size Confirm whether paper size set to the cassette matches the setting. To match the setting of the paper size.
  Paper weight Confirm whether paper weight set to the cassette matches the setting. To match the setting of the media weight.

• Code: 370, 371, 372
• Description: Duplex printing jam
• Troubleshooting Guides: Duplex printing jam occurs immediately after the power is turned on.
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. For all sensors except the Dup-IN sensor, check the detection condition of the respective sensor in the two status: One is the status in which paper remains inside the Duplex unit. The other is the status in which paper is removed from the Duplex unit. Replace the Duplex board (GOH-20 PCB), or replace the defective sensor or connection cable.
  Duplex printing jam occurs during the paper is feeding into the Duplex unit.
  Duplex clutch Confirm that the duplex clutch works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Replace the Duplex board (GOH-20 PCB) or clutch.
  Separator solenoid (Paper eject / DUP paper taking in switching gate located immediately after the fuser unit) Check visually movement of the gate by using the [Motor & Clutch Test] of the self-diagnostic mode. Check if movement is smooth or not, if amount of open / close is normal or not. Replace the separator solenoid.
  Dup-IN sensor lever Remove the duplex unit. Touch the Dup-IN sensor lever to check if its movement is smooth or not. Replace the Dup- IN sensor lever Dup-Bottom sensor lever Remove the Duplex unit and check the movement of the sensor lever. Replace the sensor lever.
  DUP-IN sensor Dup-Bottom sensor Check the sensitivity of each sensor in the two conditions: One is the status in which paper remains in the Duplex unit, and the other is the status in which no paper remains in the Duplex unit. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Replace the Duplex board (GOH-20 PCB), or replace the defective sensor or the connection cable.
  Paper reversing transport path Check that any foreign materials such as paper chip or blue do not exist that hampers the smooth movement of paper in the paper reversing transport path. Remove the foreign material.
  Duplex printing jam occurs during the paper transporting at inside of the Duplex unit
  Dup-F sensor lever Remove the Duplex unit and check movement of the Dup-F sensor lever. Replace the Dup-F sensor lever.
  Dup-R sensor lever Remove the Duplex unit and check movement of the Dup-R sensor lever. Replace the Dup-R sensor lever.
  Check the detection condition of the sensor signal Check the sensitivity of each sensor in the two conditions: one is the status in which paper remains in the duplex unit, and the other is the status in which no paper remains in the duplex unit. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Replace the Duplex board (GOH-20 PCB), or replace the defective sensor or connection cable.
  Paper is not supplied from the Duplex unit to the regist roller.
  Duplex clutch Confirm that the Duplex clutch works normally by using the Motor & Clutch Test of the self-diagnostic mode. Confirm it by listening to the sound. Replace the GOH-20 board or clutch.

• Code: 373, 383
• Description: Duplex printing jam
• Troubleshooting Guides: Duplex printing jam occurs immediately after the power is turned on.
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. For all sensors except the Dup-IN sensor, check the detection condition of the respective sensor in the two status: One is the status in which paper remains inside the Duplex unit. The other is the status in which paper is removed from the Duplex unit. Replace the Duplex board (GOH-20 PCB), or replace the defective sensor or connection cable.
  Duplex printing jam occurs during the paper is feeding into the Duplex unit.
  Duplex clutch Confirm that the duplex clutch works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Replace the Duplex board (GOH-20 PCB) or clutch.
  Separator solenoid (Paper eject / DUP paper taking in switching gate located immediately after the fuser unit) Check visually movement of the gate by using the [Motor & Clutch Test] of the self-diagnostic mode. Check if movement is smooth or not, if amount of open / close is normal or not. Replace the separator solenoid.
  Dup-IN sensor lever Remove the duplex unit. Touch the Dup-IN sensor lever to check if its movement is smooth or not. Replace the Dup- IN sensor lever Dup-Bottom sensor lever Remove the Duplex unit and check the movement of the sensor lever. Replace the sensor lever.
  DUP-IN sensor Dup-Bottom sensor Check the sensitivity of each sensor in the two conditions: One is the status in which paper remains in the Duplex unit, and the other is the status in which no paper remains in the Duplex unit. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Replace the Duplex board (GOH-20 PCB), or replace the defective sensor or the connection cable.
  Paper reversing transport path Check that any foreign materials such as paper chip or blue do not exist that hampers the smooth movement of paper in the paper reversing transport path. Remove the foreign material.
  Duplex printing jam occurs during the paper transporting at inside of the Duplex unit
  Dup-F sensor lever Remove the Duplex unit and check movement of the Dup-F sensor lever. Replace the Dup-F sensor lever.
  Dup-R sensor lever Remove the Duplex unit and check movement of the Dup-R sensor lever. Replace the Dup-R sensor lever.
  Check the detection condition of the sensor signal Check the sensitivity of each sensor in the two conditions: one is the status in which paper remains in the duplex unit, and the other is the status in which no paper remains in the duplex unit. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Replace the Duplex board (GOH-20 PCB), or replace the defective sensor or connection cable.
  Paper is not supplied from the Duplex unit to the regist roller.
  Duplex clutch Confirm that the Duplex clutch works normally by using the Motor & Clutch Test of the self-diagnostic mode. Confirm it by listening to the sound. Replace the GOH-20 board or clutch.

• Code: 380
• Description: Feed jam Jam occurs immediately after the power is turned on.
• Troubleshooting Guides: Paper path of the front unit Open the front cover check if paper is not jammed in the paper path. Remove the jammed paper.
  Check the sensor levers of the paper IN1 sensor, that of the paper IN2 sensor and that of the WR sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor with the normal sensor lever.
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the [Self-diagnostic mode] – [SWITCH SCAN] function. Replace either the CU/PU board or the front sensor board (RSG PCB) or connection cable.
  Check the output signal levels of the paper IN1 sensor, that of the paper IN2 sensor and that of the WR sensor. Check for the following signals at the FSNS connector 18 of the CU/PU board. Pin-4: Paper IN1 sensor Pin-3: Paper IN2 sensor Pin-2: WR sensor Confirm that the above signal levels change when the sensor lever is operated. Replace the front sensor board (RSG PCB)
  Check the power voltages supplied to the front sensor board (RSG PCB) Check the 5V power at the FSNS connector 25 of the front sensor board (RSG PCB). Pin-1: 5V power supply Pin-5: 0VL Replace the connection cable.
  Paper path of the front unit Check if paper is jammed or not in the paper path. Remove the jammed paper.
  Check the sensor levers of the paper IN1 sensor, that of the paper IN2 sensor and that of the WR sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor with the normal sensor lever.
  Paper Hopping motor Confirm that the paper hopping motor works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Replace the CU/ PU board, or replace the paper hopping motor.
  Paper Hopping motor driver Remove the MOTERCL connector 1 of the CU/PU board and check the following at the connector side. Several MÙ between pin-5 – FG. Several MÙ between pin-6 – FG. Several MÙ between pin-7 – FG. Several MÙ between pin-8 – FG. Replace the CU/ PU board.
  Paper Hopping motor drive cable Check the connection condition of the cable. Check if the connector is connected in the halfway only or not, and check if the connector is inserted in a slanted angle or not. Check also that cables are assembled without any abnormality. Replace the cable with the normal cable that normalizes the connection condition.
  Paper Hopping motor drive cable Check that any cable is not pinched during assembling of the printer. Remove the MOTERCL connector 1 of the CU/PU board and check the following at the connector side. Short circuit between pin-5 – FG Short circuit between pin-6 – FG Short circuit between pin-7 – FG Short circuit between pin-8 – FG Replace the cable with the normal cable that normalizes the connection condition.
  Paper hopping motor Remove the MOTERCL connector 1 of the CU/ PU board and check that approx. 3.4Ω can be measured between pin-5 -pin-6 and pin-7 -pin-8 respectively at the connector side. Replace the paper feed motor.

• Code: 381
• Description: Paper jam
• Troubleshooting Guides: Jam occurs immediately after the power is turned on.
  Paper path of the front unit Check if paper is jammed or not in the paper path. Remove the jammed paper.
  Check the sensor lever of the WR sensor , Fuser IN sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor lever with the normal sensor lever.
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Replace either the CU/PU board (ME2 PCB) or the front sensor board (RSG PCB) or connection cable.
  Check the sensor lever of the WR sensor , Fuser IN sensor. Check for the following signals at the FSNS connector 18 of the CU/PU board. Pin-2: WR sensor Check for the following signals at the FUSER2 10 connector of the CU/PU board. Pin-8: Fuser IN sensor Confirm that the above signal levels change when the sensor lever is operated. Replace the front sensor board (RSG PCB) or CU/ PU board (ME2 PCB).
  Check the power voltages supplied to the front sensor board (RSG PCB), CU/PU board (ME2 PCB) Check the 5V power at the FSNS connector 25 of the front sensor board (RSG PCB). Pin-1: 5V power supply Pin-5: 0VL Check the 5V power at the FUSER2 10 connector of the CU/PU board (ME2 PCB). Pin-9: 5V power supply Pin-7,10: 0V Replace the connection cable.
  Jam occurs immediately after a paper is fed into the apparatus.
  Paper path on the belt. Remove the ID unit and check if paper is jammed or not in the paper path. Remove the jammed paper.
  Check the sensor lever of the WR sensor , Fuser IN sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor lever with the normal sensor lever. Replace the fuser unit.
  Paper Hopping motor driver, belt motor driver and ID motor Confirm that the paper hopping motor, belt motor and ID motor work normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Check if any load exists or not. Replace the CU/PU board, or replace the defective motor among paper hopping motor, belt motor and ID motor, or replace the ID unit or belt unit.
  Paper Hopping motor, belt motor Remove the MOTERCL connector1 of the CU/PU board and check the following at the connector side. Several MΩ between pin-1 . FG Several MΩ between pin-2 . FG Several MΩ between pin-3 . FG Several MΩ between pin-4 . FG Several MΩ between pin-5 . FG Several MΩ between pin-6 . FG Several MΩ between pin-7 . FG Several MΩ between pin-8 . FG Replace the CU/ PU board.
  Jam occurs at the way of paper path.
  Paper hopping motor driver, belt motor driver and ID motor Confirm that the paper hopping motor, belt motor and ID motor work normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Check if any load exists or not. Replace the CU/PU board, or replace the defective motor among paper hopping motor, belt motor and ID motor, or replace the ID unit or belt unit.
  Paper hopping motor, belt motor Remove the MOTERCL connector1 of the CU/ PU board (ME2 PCB) and check the following at the connector side. Several MΩ between pin-1 . FG Several MΩ between pin-2 . FG Several MΩ between pin-3 . FG Several MΩ between pin-4 . FG Several MΩ between pin-5 . FG Several MΩ between pin-6 . FG Several MΩ between pin-7 . FG Several MΩ between pin-8 . FG Replace the CU/ PU board (ME2 PCB).
  Fuser unit Check if the fuser nit is pressed in until the connector in the bottom of the fuser unit is completely connected. Re-set the fuser unit.

• Code: 382
• Description: Paper exit jam
• Troubleshooting Guides: Paper exit jam occurs immediately after the power is turned on.
  Paper path of the paper eject unit Check if paper is jammed or not in the paper path. Remove the jammed paper.
  Check the sensor lever of the fuser EXIT sensor / EXIT sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the fuser unit. Replace the sensor lever.
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Replace the CU/ PU board or relay board or its cable or its connection cable.
  Check the output signal level of the fuser EXIT sensor / EXIT sensor. Check for the following signals at the FUSER2 10 connector of the CU/PU board (ME2 PCB). Pin-11: Fuser EXIT sensor Check for the following signals at the RELAY connector 9 of the CU/PU board (ME2 PCB). Pin-11: EXIT sensor Confirm that the above signal levels change when the sensor lever is operated. Replace the fuser unit or EXIT sensor.
  Check the power voltages supplied to the CU/PU board (ME2 PCB). Check the 5V power voltage at the FUSER2 10 connector of the CU/PU board. Pin-9: 5V power supply Pin-7, 10: 0VL Check the 5V power voltage at the EXIT connector of the relay board. Pin-1: 5V Pin-3: 0V Replace the connection cable.
  Signal cable for relay board, EXIT sensor cable Check that FFC is normally inserted at the RELAY connector9 of the CU/PU board (ME2 PCB) and at the PU IF connector 28. Check that the relay board and the EXIT sensor are normally connected. Normalize the connection condition.
  Signal cable for relay board, EXIT sensor cable Confirm that the cables are not pinched, sheathes are not peeled off, and they are assembled normally. Replace the connecting cable and normalize the assembled condition.
  Paper exit jam occurs after a paper is fed into the apparatus.
  Face Up Stacker Cover Confirm that it is either fully opened or fully closed . Eliminate any in-between condition of the cover between the fully open position and fully closed position.
  Duplex pull-in gate Confirm that the Duplex pull-in gate works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Is it set to the paper eject side normally? Replace the Duplex pullin gate or the Duplex solenoid
  Rear panel Check that the installation condition of the rear panel hampers smooth movement of a paper in the paper path, or not. Remove the rear cover and reassemble it.
  Paper path of the eject unit Check that any mechanical load does not exist that hampers the smooth transporting of paper in the paper path of the paper eject unit, by the visual inspection. Check if the paper eject motor becomes difficult to rotate or not. Correct the portion that becomes mechanical load.
  Sensor lever of the paper exit sensor Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor lever with the normal sensor lever.
  Fuser motor Confirm that the fuser motor works normally by using the [Motor & Clutch Test] of the selfdiagnostic mode. Remove the fuser and visually check the rotate of roller and gear. Replace the CU/ PU board (ME2 PCB) or fuser motor or fuser unit.
  Fuser motor drive cable Check the connection condition of the cables. Visually check the CU/PU board DCHEAT connector 4 for half-way connection, slanted angle insertion, and abnormal cables assembly. Also check the connector connected with the fuser motor in the same manner. Replace the cable with the normal cable that normalizes the connection condition.
  Paper exit jam occurs at the way of paper path.
  Fuser motor Confirm that the fuser motor works normally by using the [Motor & Clutch Test] of the selfdiagnostic mode. Remove the fuser and visually check the rotate of roller and gear. Replace the CU/ PU board (ME2 PCB), fuser motor or fuser unit.

Solve OKI C834dnw Error codes

• Code: 385
• Description: Fuser unit jam
• Troubleshooting Guides: Fuser unit jam occurs immediately after the power is turned on.
  Paper path of the fuser unit Check if paper is not jammed in the paper path. Remove the jammed paper.
  Check the sensor levers of the fuser IN sensor and the fuser EXIT sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the fuser unit.
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the [SWITCH SCAN] function of the self-diagnostic mode. Replace the CU/PU board (ME2 PCB) or connection cable.
  Check the output signal level of the fuser IN sensor and the fuser EXIT sensor. Check for the following signals at the FUSER2 10 connector of the CU/PU board. Pin-8: Fuser IN sensor Pin-11: Fuser EXIT sensor Confirm that the above signal levels change when the sensor lever is operated. Replace the fuser unit.
  Check the power voltages supplied to the fuser IN sensor, fuser EXIT sensor. Check the 5V power voltage at the FUSER2 10 connector of the CU/PU board (ME2 PCB). 9pin: 5V power supply 7,10pin: 0VL Replace the CU/ PU board (ME2 PCB)
  Fuser unit jam occurs at the way of paper path.
  Fuser motor Confirm that the fuser motor works normally by using the [Motor & Clutch Test] of the selfdiagnostic mode. Remove the fuser and visually check the rotate of roller and gear. Replace the CU/ PU board (ME2 PCB) or fuser motor or fuser unit.
  Detected temperatures of the fuser belt and the backup roller Check temperatures detected at the fuser belt and the backup roller in the self-diagnostic mode. Has abnormally low (lower than the room temperature) or high (250°C) temperature been detected? Replace the fuser unit, relay board (P6Z PCB) or CU/PU board.
  Fuser motor drive cable Check the connection condition of the cables. Check if the DCHEAT connector 4 of the CU/ PU board is connected in the halfway only or not, and check if the connector is inserted in a slanted angle or not. Check also that cables are assembled without any abnormality. Also check the connector connected with the fuser motor in the same manner. Replace the cable with the normal cable that normalizes the connection condition.

• Code: 390
• Description: Paper feed jam
• Troubleshooting Guides: Jam occurs immediately after the power is turned on. (MP tray)
  Paper path of the multipurpose tray Check if paper is jammed or not in the paper path. Remove the jammed paper.
  Check the sensor levers of the paper IN2 sensor and the WR sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor with the normal sensor lever
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the SWITCH SCAN function of the self-diagnostic mode. Replace either the CU/PU board or the front sensor board (RSG PCB) or connection cable.
  Check the sensor output signal level of the paper IN2 sensor and the WR sensor. Check for the following signals at the FSNS connector 18 of the CU/PU board. Pin-2: WR sensor Pin-3: Paper IN2 sensor Confirm that the above signal levels change when the sensor lever is operated. Replace the front sensor board (RSG PCB)
  oltages supplied to the front sensor board (RSG PCB) Check the 5V power at the FSNS connector 25 of the front sensor board (RSG PCB). Pin-1: 5V power supply Pin-5: 0VL Replace the connection cable.
  Jam occurs immediately after paper feed is started. (Multipurpose tray)
  Paper path of the multipurpose tray Check if paper is jammed or not in the paper path. Remove the jammed paper.
  Sheet Receive of the multipurpose tray Confirm that the Sheet Receive has moved up normally. Confirm that the support spindle and spring of the Sheet Receive have been installed in the specified positions normally. Correct installation of the above parts so that the Sheet Receive moves up to the specified position normally.
  Check the sensor levers of the paper IN2 sensor and the WR sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor with the normal sensor lever.
  Front cover Confirm that the locks in the right and left of the front cover are locked normally. Replace the font cover assembly
  Check the feed roller, the pickup roller, and the retard roller. Check if any foreign materials such as paper dust on the surface of the feed roller or of the pickup roller or not. Remove the foreign material. Check if the feed roller has worn out or not. Replace the feed roller.
  Paper Hopping motor Confirm that the paper hopping motor works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Replace the CU/PU board, or replace the paper feed motor.
  Paper Hopping motor driver Remove the MOTERCL connector1 of the CU/PU board and check the following at the connector side. Several MΩ between pin-5 . FG. Several MΩ between pin-6 . FG. Several MΩ between pin-7 . FG. Several MΩ between pin-8 . FG. Replace the CU/ PU board.
  MPT clutch Carry out [Motor & Clutch Test] to check if the MPT clutch works normally.
  Paper Hopping motor drive cable Check the connection condition of the cable. Check if the MOTERCL connector 1 is connected in the half-way only or not, and check if the connector is inserted in a slanted angle or not. Check also that cables are assembled without any abnormality. Replace the cable with the normal cable that normalizes the connection condition.
  Paper Hopping motor drive cable Check that any cable is not pinched during assembling of the printer. Remove the MOTERCL connector 1 of the CU/PU board and check the following at the connector side. Short circuit between pin-5 . FG Short circuit between pin-6 . FG Short circuit between pin-7 . FG Short circuit between pin-8 . FG Replace the cable with the normal cable that normalizes the connection condition.
  Paper Hopping motor Remove the MOTERCL connector 1 of the CU/ PU board and check that approx. 3.4Ω can be measured between pin-5 -pin-6 and pin-7 -pin-8 respectively at the connector side. Replace the paper hopping motor.

• Code: 391
• Description: Paper feed jam Jam occurs immediately after the power is turned on. (1st tray)
• Troubleshooting Guides: Paper path of the front unit Open the front cover check if paper is not jammed in the paper path. Remove the jammed paper.
  Check the sensor levers of the paper IN1 sensor and the paper IN2 sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor lever with the normal sensor lever.
  Check the detection condition of the sensor signal. Confirm that the sensor signals are normally detected by using the [Self-diagnostic mode] – [SWITCH SCAN] function. Replace either the CU/PU board, the front sensor board (RSG PCB) or connection cable.
  Check the output signal level of the paper IN1 sensor and that of the paper IN2 sensor. Check for the following signals at the FSNS connector 25 of the CU/PU board. Pin-4: Paper IN1 sensor Pin-3: Paper IN2 sensor Confirm that the above signal levels change when the sensor lever is operated. Replace the front sensor board (RSG PCB)
  Check the power voltages supplied to the front sensor board (RSG PCB) Check the 5V power at the FSNS connector of the front sensor board (RSF PCB). Pin-1: 5V power supply Pin-5: 0VL Replace the connection cable.
  Paper path of the front unit Check if paper is jammed or not in the paper path. Remove the jammed paper.
  Check the sensor levers of the paper IN1 sensor and the paper IN2 sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor with the normal sensor lever.
  Check the feed roller, pickup roller and the retard roller assembly of the tray. Check if any foreign materials such as paper dust on the surface of the feed roller or of the pickup roller or not. Remove the foreign material. Check if the feed roller or the pickup roller has worn out or not. Replace the feed roller, the pickup roller and the retard roller assembly of the tray.
  Paper Hopping motor Confirm that the paper hopping motor works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Replace the CU/ PU board or the paper hopping motor
  Paper Hopping motor driver Remove the MOTERCL connector 1 of the CU/PU board and check the following at the connector side. Several MΩ between pin-5 . FG. Several MΩ between pin-6 . FG. Several MΩ between pin-7 . FG. Several MΩ between pin-8 . FG. Replace the CU/ PU board.
  Paper Hopping motor drive cable Check the connection condition of the cable. Check if the connector is connected in the halfway only or not, and check if the connector is inserted in a slanted angle or not. Check also that cables are assembled without any abnormality. Replace the cable with the normal cable that normalizes the connection condition.
  Paper Hopping motor drive cable Check that any cable is not pinched during assembling of the apparatus. Remove the MOTERCL connector 1 of the CU/PU board and check the following at the connector side. Short circuit between pin-5 . FG Short circuit between pin-6 . FG Short circuit between pin-7 . FG Short circuit between pin-8 . FG Replace the cable with the normal cable that normalizes the connection condition
  Paper Hopping motor Remove the MOTERCL connector1 of the CU/ PU board and check that approx. 3.4Ω can be measured between pin-5 -pin-6 and pin-7 -pin-8 respectively at the connector side. Replace the paper hopping motor.
  Paper feed clutch, registration clutch Check to make sure that the paper feed clutch or registration clutch works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. Open the front cover so that the rollers can be seen to check. Replace the CU/ PU board, or replace the paper feed clutch or the registration clutch.
  Clutch cable of paper hopping Check the connection condition of the cable. Check if the connector is connected in the halfway only or not, and check if the connector is inserted in a slanted angle or not. Check also that cables are assembled without any abnormality. Replace the cable with the normal cable that normalizes the connection condition.
  Paper Hopping clutch Check that any cable is not pinched during assembling of the printer. Remove the HOPLC connector 2 of the CU/PU board and check the following at the cable side. Short circuit between pin-1 . FG Remove the HOPCL connector 2 of the CU/ PU board and check that approx. 240Ω can be measured between pin-1 and pin-2. Replace the clutch and assembly it again correctly.

• Code: 400, 401
• Description: Paper size error
• Troubleshooting Guides: Jam occurs when paper end is located near the IN1 sensor.
  Multifeed of papers Open the front cover and check if multifeed of papers occurs or not. If multifeed occurs again after the jammed paper is removed, replace the retard roller of the tray in use.
  Paper size Does the paper size specified for printing matched with the paper size of paper set in the tray? Change the specified paper size or size of paper inside the tray.
  Paper IN1 sensor, paper IN2 sensor Check if shape and movement of the sensor levers is normality or not. Replace the sensor lever with the normal sensor lever.

• Code: 540, 541, 542, 543
• Description: Toner cartridge cannot be recognized.
• Troubleshooting Guides: ID unit and toner cartridge Check that the ID unit is installed in the normal position. Check that the lock lever of the toner cartridge is locked. Correct the installation to the normal installation condition.
  Toner sensor Is the receptor of the toner sensor dirtied? Wipe off the dirty from the toner sensor.
  Confirm that the toner sensor works normally by using the [SWITCH SCAN] function of the selfdiagnostic mode. Place a white paper in front of the toner sensor, and check if the SCAN state changes or not. Replace the toner sensor board or CU/ PU board or the FFC between the toner sensor board and the CU/PU board.
  Fuse of CU/PU board Check if the F11 is cutting or not. Replace the CU/ PU board.

– Get more information about Epson XP 15000 troubleshooting, click here

– Get more error code list with quick guide to fix printer product, click here
– About get help with reseting Epson inkpad or others, click here

Waste Ink Pad Counter Utility Functions:

– Cleaning printhead.
– Ink charge.
– Fix Epson red lights blinking Error

– Fix Epson Service Required Error: A printer’s ink pad at the end of its service life Please contact Epson Support.

– Check the current value of waste ink counters and ink level counters.
– Clear Waste Ink Counters.
– Read and write serial number.
– Read and write USB ID.
– Read and write HEAD ID.
– Make EEPROM dump, backup.
– Paper feed test.
– Nozzle check.
– Color check pattern.
– Initialize (disable) PF deterioration offset.
– Retrieve device information

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