Code :

Code: L4-06
Description: Transfer unit lift trouble
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. Harness and connector connection trouble. Replace the transfer unit separation clutch.

Code: L4-12
Description: Secondary transfer separation trouble
Causes: A change in the state of the separation sensor is not detected in the specified time during separating operation of the secondary transfer unit. Secondary transfer unit separation mechanism trouble. Secondary transfer unit separation motor trouble. Secondary transfer unit separation sensor trouble. Connection trouble of the connector and the harness. PCU PWB trouble.
Remedy: Check the operation of the secondary transfer unit separation mechanism. Replace the secondary transfer unit separation motor. Replace the secondary transfer unit separation sensor. Check connection of the connector and the harness. Replace the PCU PWB.

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 solenoid. Fusing pressure release sensor trouble. Fusing pressure release solenoid trouble. Fusing pressure release level F, R trouble. PCU PWB trouble. Fusing motor trouble. Connection trouble of the connector and the harness.
Remedy: Replace the fusing pressure release sensor. Replace the fusing pressure release solenoid. Replace the fusing pressure release lever F, R. Replace the PCU PWB. Fusing motor trouble. Harness and connector connection trouble.

Code: L4-29
Description: HDD fan trouble
Causes: The fan lock signal is detected during rotation of the HDD fan. HDD fan trouble. MFP PWB trouble. Connection trouble of the connector and the harness.
Remedy: Use SIM6-2 to check the operation of the fan motor. Replace the HDD fan. Replace the MFP PWB. Replace the connector or 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.

Code: L4-34
Description: LSU fan trouble
Causes: The fan rotation signal is not detected in the specified time during operation of the LSU fan. Connection trouble of the connector and the harness. LSU fan trouble. LSU control PWB trouble.
Remedy: Use Sim6-2 to check the operation of the fan. Check connection of the connector and the harness. Replace the LSU fan. Replace the LSU control PWB.