Description: Optical system problem • After AGC, correct input is not obtained at CCD.
Causes: Poor contact of the connector terminals. Defective exposure lamp. Defective main PCB or inverter PCB. Incorrect shading position. CCD PCB output problem.
Remedy: Check the connection of connector CN12 on the main PCB, and the continuity across the connector terminals. Repair or replace if necessary. Replace the exposure lamp. Replace the main PCB or inverter PCB and check for correct operation. Adjust the position of the contact glass (shading plate). If the problem still occurs, replace the scanner home position switch. Replace the ISU.
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 contact glass.
Causes: Poor contact of the connector terminals. Defective scanner home position switch. Defective main PCB. Defective scanner motor.
Remedy: Check the connection of connector CN15 on the main PCB and the continuity across the connector terminals. Remedy or replace if necessary. Replace the scanner home position switch. Replace the main PCB and check for correct operation. Replace the scanner motor.
Code: C400
Description: Polygon motor synchronization problem • The polygon motor does not reach a stable speed within 19 s of the polygon motor remote signal turning on.
Causes: Poor contact of the connector terminals. Defective polygon motor.Defective power source PCB.
Remedy: Check the connection of connector CN3 on the main PCB and the continuity across the connector terminals. Remedy or replace if necessary. Replace the LSU. Check if 24 V DC is present at CN1-2 on the power source PCB. If not, replace the power source PCB.
Code: C401
Description: Polygon motor steady-state problem • The polygon motor rotation is not stable for 400 ms after the polygon motor rotation has been stabilized.
Causes: Poor contact of the connector terminals. Defective polygon motor. Defective power source PCB.
Remedy: Check the connection of connector CN3 on the main PCB and the continuity across the connector terminals. Remedy or replace if necessary. Replace the LSU. Check if 24 V DC is present at CN1-2 on the power source PCB. If not, replace the power source PCB.
Code: C420
Description: BD steady-state problem • The VTC detects a BD error for 800 ms after the polygon motor rotation has been stabilizad.
Causes: Poor contact of the connector terminals. Defective LSU. Defective main PCB.
Remedy: Check the connection of connector CN18 on the main PCB and the continuity across the connector terminals. Remedy or replace if necessary. Replace the LSU. Replace the main PCB and check for correct operation.
Code: C510
Description: Main charger problem • MC ALM signal is detected continuously for 800 ms when MC REM signal is turned on.
Causes: Poor contact of the high-voltage transformer PCB connector terminals. Defective high-voltage transformer PCB. Leakage during main charging. Deformed high-voltage transformer PCB terminal spring.
Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, repair or replace the cable. Replace the high-voltage transformer PCB. Check and clean the main charger unit. Replace the spring.