• Code: C3825, C3826
• Description: • C3825: Fusing abnormally low temperature detection (Main of the heating roller) • C3826: Fusing abnormally low temperature detection (Center of the heating roller). • C3825: The heating roller temperature sensor (TEMS) continues to detect a temperature lower than a predetermined one for a predetermined period of time. • C3826: The heating roller thermistor/2 (TH2) continues to detect a temperature lower than a predetermined one for a predetermined period of time.
• Causes: • Fusing unit • C3825: Heating roller temperature sensor (TEMS) • C3826: Heating roller thermistor/2 (TH2) • MFP board (MFPB)
• Remedy: 1. Check the fusing unit for correct installation (whether it is secured in position). 2. Check the open/close operation of the right door. 3. Check the fusing unit and MFPB for proper connection and correct or change as necessary. 4. Replace the fusing unit. 5. Replace MFPB.

• Code: C3922, C3925, C3926
• Description: • C3922: Fusing sensor wire breaks detection (Edge of the heating roller) • C3925: Fusing sensor wire breaks detection (Main of the heating roller) • C3926: Fusing sensor wire breaks detection (Center of the heating roller). • C3922: After a predetermined period of time after the warm-up stage is started, the heating roller thermistor/1 (TH1) voltage does not decrease by predetermined steps (temperature rise) within a predetermined period of time. • C3925: After a predetermined period of time after the warm-up stage is started, the heating roller temperature sensor (TEMS) voltage does not increase by predetermined steps (temperature rise) within a predetermined period of time. • C3926: After a predetermined period of time after the warm-up stage is started, the heating roller thermistor/2 (TH2) voltage does not decrease by predetermined steps (temperature rise) within a predetermined period of time.
• Causes: • Fusing unit • C3922: Heating roller thermistor/1 (TH1) • C3925: Heating roller temperature sensor (TEMS) • C3926: Heating roller thermistor/2 (TH2) • MFP board (MFPB)
• Remedy: 1. Check the fusing unit for correct installation (whether it is secured in position). 2. Check the open/close operation of the right door. 3. Check the fusing unit and MFPB for proper connection and correct or change as necessary. 4. Replace the fusing unit. 5. Replace MFPB.

• Code: C392A
• Description: Heating roller temperature sensor contamination (Main of the heating roller). When the machine is in standby mode after a predetermined period of time after the warm-up stage is started, detected temperature of the heating roller temperature sensor (TEMS) higher than a given temperature for a given period of time consecutively
• Causes: • Fusing unit • Heating roller temperature sensor (TEMS) • MFP board (MFPB)
• Remedy: 1. Wipe the TEMS clean of dirt if any. <Cleaning procedure> • Clear away a dirt or a foreign object on the sensor with a cotton swab. • When a dirt is left even if you cleaned the sensor by above procedure, clear away a dirt or a foreign object on the sensor using a cotton swab dampened with the alcohol. And, wipe off the sensor with a dry cotton swab afterwards. 2. Check the TEMS for installed position and proper connector connection. 3. Check the connection of the fusing unit. 4. Check the fusing unit and MFPB for proper connection and correct or change as necessary. 5. Replace the fusing unit. 6. Replace MFPB.

• Code: C392B
• Description: Fusing sensor wire breaks detection (Center of the heating roller). The difference between the temperature corrected by the heating roller thermistor/1 (TH1) and the temperature detected by the heating roller thermistor/2 (TH2) exceeds a predetermined value.
• Causes: • Fusing unit • Heating roller thermistor/1 (TH1) • Heating roller thermistor/2 (TH2) • MFP board (MFPB)
• Remedy: 1. Check the fusing unit for correct installation (whether it is secured in position). 2. Check the open/close operation of the right door. 3. Check the fusing unit and MFPB for proper connection and correct or change as necessary. 4. Replace the fusing unit. 5. Replace MFPB.

• Code: C4091
• Description: I/F communication error. Communication between the controller control unit and the engine control unit is not completed even after the lapse of a predetermined period of time.
• Causes: MFP board (MFPB)
• Remedy: 1. Reboot the machine. 2. Replace MFPB.

• Code: C40A1, C40A2
• Description: • C40A1: Mechanical controller sub-CPU communication error • C40A2: Mechanical controller PF communication data error. A CPU communication error is detected.
• Causes: MFP board (MFPB)
• Remedy: 1. Turn OFF the main power switch, disconnect and then connect the power cord. Wait for 10 sec. or more after connect the power cord, and turn ON the main power switch. 2. Rewrite the firmware. 3. Replace MFPB.

• Code: C4101
• Description: Polygon motor rotation trouble. • The polygon motor fails to turn stably even after the lapse of a given period of time after activating and changing rotation speed the polygon motor. • Motor lock signal detects HIGH for a given period time consecutively during the polygon motor is rotating.
• Causes: • PH unit • Front side board (FRB) • MFP board (MFPB)
• Remedy: 1. Check the connector between the PH unit-FRB CN17 for proper connection and correct as necessary. 2. Replace the PH unit. 3. FRB fuse conduction check 4. Replace FRB. 5. Replace MFPB.

• Code: C4501
• Description: Laser malfunction. • SOS signal is not detected even after the lapse of a given period of time after starting the laser output. • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
• Causes: • PH unit • MFP board (MFPB)
• Remedy: 1. Check the connector between the PH unit-relay CN63-MFPB CN20E for proper connection and correct as necessary. 2. Replace the PH unit. 3. Replace MFPB.