• Code: C3452
• Description: Warming-up failure (sub)
  - The thermistor/2 (TH2) detected that the temperature of the surface of the fusing roller did not reach the specified level even after the lapse of given period of time has passed during warm-up.
• 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 MFPB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change MFPB. 6 Change DCPU.

• Code: C3751
• Description: Abnormally high fusing temperature (main)
  - The temperature detected by the thermistor/1 (TH1) is over the specified temperature for more than the specified period of time after power is turned ON.
• 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 MFPB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change MFPB. 6 Change DCPU.

• Code: C3752
• Description: Abnormally high fusing temperature (sub)
  - The temperature detected by the thermistor/2 (TH2) is over the specified temperature for more than the specified period of time after power is turned ON.
• 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 MFPB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change MFPB. 6 Change DCPU.

• Code: C3851
• Description: Abnormally low fusing temperature (main)
  - The temperature detected by the thermistor/1 (TH1) is below the specified temperature for more than the specified 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 MFPB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change MFPB. 6 Change DCPU.

• Code: C3852
• Description: Abnormally low fusing temperature (sub)
  - The temperature detected by the thermistor/2 (TH2) is below the specified temperature for more than the specified 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 MFPB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change MFPB. 6 Change DCPU.

• Code: C4001
• Description: Faulty HSYNC (SOS)
  - 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 falling 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-MFPB P001, P002 for proper connection and correct as necessary. 3 Change PH unit. 4 Change MFPB.

• Code: C4101
• Description: Polygon motor rotation 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 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-MFPB P001, P002 for proper connection and correct as necessary. 3 Change PH unit. 4 Change MFPB.

• Code: C5102
• Description: Main motor malfunction
  - The main motor (M1) lock signal remains HIGH for a continuous 1-sec. period after 1- sec. after the main motor has started turning.
• Remedy: 1 Check the connector between M1-MFPB P006 for proper connection and correct as necessary. 2 Check M1 for correct drive coupling and correct as necessary. 3 M1 operation check. 4 Change MFPB. 5 Change DCPU