Causes: No change in the lift motor rotation sensor signal is detected within the specified time after outputting the lift motor ON signal. The lift motor rotation sensor signal varies though the lift motor is stopped. Lift motor rotation sensor trouble. LCC control PWB trouble Lift mechanism trouble. Lift motor trouble. Connection trouble of the connector and the harness.
Remedy: Use SIM4-2 and 4-3 to check the operation of the sensor and the lift motor. Replace the lift motor rotation sensor. Replace the LCC control PWB. Replace the lift mechanism. Replace the lift motor. Check connection of the connector and the harness. Use SIM15 to cancel the trouble.
Code: U6-20
Description: PCU PWB - LCC communication error
Causes: Error when testing the communication line after turning ON the power or canceling the simulation. LCC control PWB trouble. PCU PWB trouble. Connector, harness connection trouble. Strong external noises. Improper combination between the main unit and the LCC.
Remedy: Cancel the error by turning OFF/ON the power. Check the connector and the harness in the communication line. Replace the LCC control PWB. Replace the PCU PWB.
Code: U6-21
Description: LCC paper transport motor trouble
Causes: No change in the paper transport motor rotation sensor signal is detected within the specified time after outputting the paper transport motor ON signal. The paper transport motor rotation sensor signal varies though the paper transport motor is stopped. Paper transport motor rotation sensor trouble. LCC control PWB trouble. Mechanism trouble. Paper transport motor trouble. Connection trouble of the connector and the harness.
Remedy: Use SIM4-3 to check the operation of the paper transport motor. Replace the paper transport motor. Replace the LCC control PWB. Replace the mechanism. Replace the paper transport motor. Check connection of the connector and the harness.
Code: U6-22
Description: LCC 24V power trouble
Causes: The DC24V power is not supplied from the main unit to the LCC. Connector, harness connection trouble. LCC control PWB trouble. Power source unit trouble.
Remedy: Check the connector and the harness in the power line. Replace the power unit. Replace the LCC control PWB.
Code: U6-23
Description: A3LCC tray descending trouble
Causes: Reverse-winding detection SW-ON. The wire is wound reversely. Reverse-winding detection SW trouble. Connector, harness connection trouble. LCC control PWB trouble.
Remedy: Check the wire. Replace the reverse-winding SW and the LCC control PWB. Check connection of the connector and the harness.