• Code: C310
• Description: Scanner carriage problem • The home position is not correct when the power is turned on or at the start of copying using the bypass table.
• Causes: Poor contact of the connector terminals. Defective scanner home position switch. Defective main PCB or scanner motor PCB. Defective scanner motor.
• Remedy: Check the connection of connector CN5 on the main PCB and the continuity across the connector terminals. Repair or replace if necessary. Replace the scanner home position switch. Replace the main PCB or scanner motor PCB and check for correct operation. Replace the scanner motor.

• Code: C332
• Description: Scanner watchdog problem • The main routine does not run within 8.192 ms of the main switch being turned on
• Causes: Defective main PCB.
• Remedy: Replace the main PCB and check for correct operation.

• Code: C340
• Description: Original detection position problem • The original size detection microcomputer in the main PCB cannot store initial data correctly.
• Causes: Poor contact of the connectors. Defective original size sensor. Defective main PCB or scanner motor PCB.
• Remedy: Check the connection of connector CN7 on the scanner motor PCB and the continuity across the connector terminals. Repair or replace if necessary. Replace the original size sensor. Replace the main PCB or scanner motor PCB and check for correct operation.

• Code: C400
• Description: Polygon motor synchronization problem • The polygon motor does not reach the stable speed within 9 s of the polygon motor remote signal turning on.
• Causes: Poor contact of the polygon motor connector terminals. Defective polygon motor. Defective power source PCB. Defective engine PCB.
• Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Replace the LSU. Check if 24 V DC is supplied to CN6-5 on the engine PCB. If not, replace the power source PCB. Check if 24 V DC is output from CN7-1 on the engine PCB. If not, replace the engine PCB.

• Code: C401
• Description: Polygon motor steadystate problem • The polygon motor rotation is not stable for 600 ms after the polygon motor rotation has been stabilized.
• Causes: Poor contact of the polygon motor connector terminals. Defective polygon motor. Defective power source PCB. Defective engine PCB.
• Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Replace the LSU. Check if 24 V DC is supplied to CN6-5 on the engine PCB. If not, replace the power source PCB. Check if 24 V DC is output from CN7-1 on the engine PCB. If not, replace the engine PCB.

• Code: C420
• Description: BD steady-state problem • The VTC detects a BD error for 600 ms after the polygon motor rotation has been stabilized.
• Causes: Defective laser diode. Defective polygon motor. Defective main PCB.
• Remedy: Replace the LSU. Replace the LSU. Replace the main PCB.

• Code: C510
• Description: Main charger problem • MC ALM signal is detected continuously for 400 ms when MC REM signal is turned on.
• Causes: Defective highvoltage transformer PCB. Leakage during main charging.
• Remedy: Replace the high-voltage transformer PCB. Check and clean the main charger assembly.

• Code: C511
• Description: Transfer/separation highvoltage problem • STALM signal is detected continuously for 400 ms when TC/SC REM signal is turned on.
• Causes: Defective highvoltage transformer PCB. Leakage during transfer/separation charging.
• Remedy: Replace the high-voltage transformer PCB. Check and clean the transfer charger assembly.