• Code: C3752
• Description: Fusing failure (abnormally high fusing temperature 2)
  - The temperature detected by the thermistor/1 (TH1) remains higher than a given temperature for a given period of time.
• Remedy: 1 Check the fusing unit for correct installation. 2 Check the open/close operation of the right door. 3 Check the fusing unit, DCPU and PRCB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change PRCB. 6 Change DCPU.

• Code: C3851
• Description: Fusing failure (abnormally low fusing temperature)
  - The temperature detected by the thermistor/2 (TH2) remains higher than a given temperature for a given period of time.
• Remedy: 1 Check the fusing unit for correct installation. 2 Check the open/close operation of the right door. 3 Check the fusing unit, DCPU and PRCB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change PRCB. 6 Change DCPU.

• Code: C4001
• Description: Faulty HSYNC
  - The SOS sensor does not detect a rising edge of SOS within a given period of time after the polygon motor has started turning and a laser output has been started.
  - The SOS sensor detects no rising edges of SOS while VIA (image area control) is ON.
• Remedy: 1 Turn OFF and ON the power switch. 2 Check the connector between PH unit- PRCB CN1, CN2 for proper connection and correct as necessary. 3 Change PH unit. 4 Change PRCB.

• Code: C4101
• Description: Polygon motor malfunction
  - A HIGH polygon motor lock signal is not detected within a given period of time that begins 0.5 sec. after the polygon motor has started turning.
  - A LOW polygon motor lock signal is not detected for a continuous given period of time while the rotation of the polygon motor remains stabilized.
• Remedy: 1 Turn OFF and ON the power switch. 2 Check the connector between PH unit- PRCB CN1, CN2 for proper connection and correct as necessary. 3 Change PH unit. 4 Change PRCB.

• Code: C5102
• Description: Main motor malfunction
  - The main motor (M1) lock signal remains HIGH for a continuous 1-sec. period at any time 1 sec. after the main motor has started turning.
• Remedy: 1 Check the connector between M1-PRCB CN6 for proper connection and correct as necessary. 2 Check M1 for correct drive coupling and correct as necessary. 3 M1 operation check. 4 Change PRCB. 5 Change DCPU.

• Code: C6101
• Description: Scanner home detection failure
  - When the power switch is turned ON or a scan operation is completed, detecting the home position fails.
• Remedy: 1 Turn OFF and ON the power switch. 2 Check the connector between M4-PRCB P101 for proper connection and correct as necessary. 3 Check M4 for correct drive coupling and correct as necessary. 4 Check the connector between CIS-PRCB P102 for proper connection and correct as necessary. 5 M4 operation check 6 Change M4. 7 Change CIS 8 Change MFPB.

• Code: C9401
• Description: Scanner lamp error
  - When the power switch is turned ON or a scan operation is completed, the light quantity is checked and the shading compensation is performed. At this time, trouble is detected.
• Remedy: 1 Turn OFF and ON the power switch. 2 Check the connector between CIS-PRCB P102 for proper connection and correct as necessary. 3 Change CIS 4 Change MFPB.

• Code: CC102
• Description: Controller - engine connection failure
  - The engine control system can not communicate with the controller.
• Remedy: 1 Turn OFF and ON the power switch. 2 Change PRCB.