• Code: C3303
• Description: Fusing cooling fan motor/ 1 failure to turn • The fan motor lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: Fusing cooling fan motor/1 (FM2) Printer control board (PRCB)
• Remedy: 1 Check the FM2 connector for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM2 operation check PRCB CN11-1 (REM) PRCB CN11-3 (LOCK) K-9 4 Change FM2 5 PRCB ICP9 conduction check 6 Change PRCB

• Code: C3305
• Description: Fusing cooling fan motor/ 3 failure to turn • The fan motor lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: Fusing cooling fan motor/3 (FM5) Paper feed/transport drive board (PFTDB)
• Remedy: 1 Check the FM5 connector for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM5 operation check PFTDB CN5-9 (REM) PFTDB CN5-11 (LOCK) Q-7 4 Change FM5 5 PFTDB ICP2 conduction check 6 Change PFTDB

• Code: C3424
• Description: Fusing heaters trouble (soaking side) • After warm-up operation starts, the soaking roller thermistor does not detect a temperature as high as a predetermined one though a predetermined period of time has elapsed.
• Causes: Fusing unit IH power supply (IHPU) DC power supply (DCPU) Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, MFPB and DCPU for proper connection and correct or change as necessary. 4 Change fusing unit 5 Change IHPU 6 Change PRCB 7 Change DCPU

• Code: C3425
• Description: Fusing heaters trouble (NC sensor) • After warm-up operation starts, the heating roller temperature sensor/1 does not detect a temperature as high as a predetermined one though a predetermined period of time has elapsed.
• Causes: Fusing unit Heating roller temperature sensor/1 (TEMS1) IH power supply (IHPU) Relay drive board (REDB) Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, MFPB and REDB for proper connection and correct or change as necessary. 4 Change TEMS1 5 Change fusing unit 6 Change IHPU 7 PRCB ICP17 conduction check 8 Change PRCB 9 Change REDB

• Code: C3721
• Description: Fusing abnormally high temperature detection (Center of the heating roller) • The heating roller temperature sensor/2 continues to detect a temperature higher than a predetermined one for a predetermined period of time. • The signal is turned ON to activate the hard ratchet in the middle of the heating side.
• Causes: Fusing unit Heating roller temperature sensor/1 (TEMS1) Heating roller temperature sensor/2 (TEMS2) Heating roller temperature sensor/3 (TEMS3) IH power supply (IHPU) Relay drive board (REDB) Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, MFPB and REDB for proper connection and correct or change as necessary. 4 Change TEMS1, TEMS2 or TEMS3 5 Change fusing unit 6 Change IHPU 7 Change PRCB 8 Change REDB

• Code: C3722
• Description: Fusing abnormally high temperature detection (Edge of the heating roller) • The heating roller temperature sensor/3 continues to detect a temperature higher than a predetermined one for a predetermined period of time. • The signal is turned ON to activate the hard ratchet at the edges of the heating side.
• Causes: Fusing unit Heating roller temperature sensor/1 (TEMS1) Heating roller temperature sensor/2 (TEMS2) Heating roller temperature sensor/3 (TEMS3) IH power supply (IHPU) Relay drive board (REDB) Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, MFPB and REDB for proper connection and correct or change as necessary. 4 Change TEMS1, TEMS2 or TEMS3 5 Change fusing unit 6 Change IHPU 7 Change PRCB 8 Change REDB

• Code: C3724
• Description: Fusing abnormally high temperature detection (soaking side) • The soaking roller thermistor/1 continues to detect a temperature higher than a predetermined one for a predetermined period of time. • The signal is turned ON to activate the hard ratchet on the soaking side.
• Causes: Fusing unit IH power supply (IHPU) DC power supply (DCPU) Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, MFPB and DCPU for proper connection and correct or change as necessary. 4 Change fusing unit 5 Change IHPU 6 Change PRCB 7 Change DCPU

• Code: C3725
• Description: Fusing abnormally high temperature detection (NC sensor) • The heating roller temperature sensor/1 continues to detect a temperature higher than a predetermined one for a predetermined period of time.
• Causes: Fusing unit Heating roller temperature sensor/1 (TEMS1) Heating roller temperature sensor/2 (TEMS2) Heating roller temperature sensor/3 (TEMS3) IH power supply (IHPU) Relay drive board (REDB) Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, MFPB and REDB for proper connection and correct or change as necessary. 4 Change TEMS1, TEMS2 or TEMS3 5 Change fusing unit 6 Change IHPU 7 Change PRCB 8 Change REDB