• Code: C4501
• Description: Laser malfunction • SOS signal is not detected even after the lapse of a given period of time after staring the laser output. • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
• Causes: PH unit PH relay board (REYB/PH) Printer control board (PRCB)
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH unit 3 REYB/PH ICP6 conduction check 4 Change REYB/PH 5 PRCB ICP17 conduction check 6 Change PRCB

• Code: C5104
• Description: Transfer belt motor’s failure to turn • The motor lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: Transfer belt motor (M1) Printer control board (PRCB)
• Remedy: 1 Check the M1 connector for proper connection and correct as necessary. 2 Check M1 for proper drive coupling and correct as necessary. 3 Check the PRCB connector for proper connection and correct as necessary. 4 M1 operation check PRCB CN35-3 (REM) PRCB CN35-6 (LOCK) K-3 5 Change M1 6 PRCB ICP15 conduction check 7 Change PRCB

• Code: C5105
• Description: Transfer belt motor’s turning at abnormal timing • The motor lock signal remains LOW for a predetermined continuous period of time while the motor remains stationary.
• Causes: Transfer belt motor (M1) Printer control board (PRCB)
• Remedy: 1 Check the M1 connector for proper connection and correct as necessary. 2 Check M1 for proper drive coupling and correct as necessary. 3 Check the PRCB connector for proper connection and correct as necessary. 4 M1 operation check PRCB CN35-3 (REM) PRCB CN35-6 (LOCK) K-3 5 Change M1 6 PRCB ICP15 conduction check 7 Change PRCB

• Code: C5304
• Description: IH cooling fan motor/1’s failure to turn • The fan lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: IH cooling fan motor/1 (FM10) Printer control board (PRCB)
• Remedy: 1 Check the FM10 connector for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM10 operation check PRCB CN8-5 (REM) PRCB CN8-7 (LOCK) C-16 4 Change FM10 5 PRCB ICP10 conduction check 6 Change PRCB

• Code: C5306
• Description: IH cooling fan motor/2’s failure to turn • The fan lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: IH cooling fan motor/2 (FM12) Printer control board (PRCB)
• Remedy: 1 Check the FM12 connector for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM12 operation check PRCB CN8-8 (REM) PRCB CN8-10 (LOCK) C-15 4 Change FM12 5 PRCB ICP10 conduction check 6 Change PRCB

• Code: C5351
• Description: Power supply cooling fan motor/1’s failure to turn • The fan lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: Power supply cooling fan motor/1 (FM9) DC power supply (DCPU) Printer control board (PRCB)
• Remedy: 1 Check the FM9 connector for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM9 operation check DCPU PJ008-3 (LOCK) X-15 4 Change FM9 5 DCPU F551 conduction check 6 Change DCPU 7 Change PRCB

• Code: C5354
• Description: Ozone ventilation fan motor’s failure to turn • The fan lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: Ozone ventilation fan motor (FM6) Printer control board (PRCB)
• Remedy: 1 Check the FM6 connector for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM6 operation check PRCB CN11-4 (REM) PRCB CN11-6 (LOCK) K-8 4 Change FM6 5 PRCB ICP9 conduction check 6 Change MFPB

• Code: C5356
• Description: Cooling fan motor’s failure to turn • The fan lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Causes: Cooling fan motor (FM3) Printer control board (PRCB)
• Remedy: 1 Check the FM3 connector for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM3 operation check PRCB CN15-4 (REM) PRCB CN15-6 (LOCK) K-9 4 Change FM3 5 PRCB ICP6 conduction check 6 Change MFPB