Code :

Code: L4-04
Description: Developing motor trouble (BLACK)
Causes: The motor lock signal is detected during rotation of the developing motor. Developing motor trouble. Harness and connector connection trouble. PCU PWB trouble Developing unit trouble.
Remedy: Use SIM25-1 to check the operation of the developing motor. Replace the developing motor. Check connection of the connectors and the harness. Replace the PCU PWB. Replace the developing motor. Replace the developing unit.

Code: L4-05
Description: Developing motor trouble (COLOR)
Causes: The motor lock signal is detected during rotation of the developing motor. Developing motor trouble. Harness and connector connection trouble. PCU PWB trouble Developing unit trouble.
Remedy: Use SIM25-1 to check the operation of the developing motor. Replace the developing motor. Check connection of the connectors and the harness. Replace the PCU PWB. Replace the developing motor. Replace the developing unit.

Code: L4-06
Description: Transfer unit lift trouble
When separating the primary transfer belt unit, change in the separation position sensor characteristics is not detected within the specified time.
Causes: Transfer unit position sensor trouble. PCU PWB trouble. Connection trouble of the connector and the harness. Transfer unit separation clutch operation trouble. Primary transfer belt unit is not installed.
Remedy: Use SIM6-3 to check the separating operation of the transfer unit. Install the primary transfer belt unit. Replace the transfer unit position sensor. Replace the PCU PWB. Check connection of the connector and the harness. Replace the transfer unit separation clutch.

Code: L4-11
Description: Shift motor trouble
Causes: No change in the shifter home position sensor signal is detected in the operation of the shifter initializing. Shift motor trouble. PCU PWB trouble. Connection trouble of the connector and the harness. Shifter home position sensor trouble.
Remedy: Use SIM6-1 to check the shift operation. Use SIM30-1 to check the operation of the shifter home position sensor. Replace the shift motor. Replace the PCU PWB. Check connection of the connector and the harness. Replace the shifter home position sensor.

Code: L4-16
Description: Fusing pressure release trouble
Causes: No change in the fusing pressure release sensor signal is detected within the specified time after turning ON the fusing pressure release motor. Fusing pressure release sensor trouble. Fusing pressure release motor trouble. Fusing pressure release level F, R trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
Remedy: Replace the fusing pressure release sensor. Replace the fusing pressure release motor. Replace the fusing pressure release lever F, R. Replace the PCU PWB. Check connection of the connector and the harness.

Code: L4-30
Description: MFP fan motor trouble
Causes: Fan motor trouble. MFP PWB trouble.Harness and connector connection trouble. PCU PWB trouble
Remedy: Use SIM6-2 to check the operation of the fan motor. Replace the fan motor. Replace the MFP PWB. Check connection of the connector and the harness. Replace the PCU PWB.

Code: L4-31
Description: Paper exit cooling fan trouble
Causes: The fan operation signal is not detected within the specified time in the paper exit cooling fan operation. Paper exit cooling fan trouble. PCU PWB trouble Connection trouble of the connector and the harness.
Remedy: Check connection of the connectors and the harness. Use SIM6-2 to check the rotating operation of the fan. Replace the paper exit cooling fan. Replace the PCU PWB.

Code: L4-32
Description: Power source cooling fan trouble
Causes: The fan operation signal is not detected within the specified time in the power cooling fan operation. Power cooling fan trouble. PCU PWB trouble. Connection trouble of the connector and the harness.
Remedy: Use SIM6-2 to check the rotating operation of the fan. Replace the power cooling fan. Replace the PCU PWB. Check/replace the connector or the harness.