• Code: C225C
• Description: K PC drum 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: K PC drum motor (M18) Printer control board (PRCB)
• Remedy: 1 Check the M18 connector for proper connection and correct as necessary. - - 2 Check the M18 connector for proper drive coupling and correct as necessary. - - 3 Check the PRCB connector for proper connection and correct as necessary. - - 4 M18 operation check PRCB CN35-10 (REM) PRCB CN35-13 (LOCK) K-2 5 Change M18 - - 6 PRCB ICP14 conduction check - - 7 Change PRCB

• Code: C2350
• Description: Toner suction fan motor’s failure to turn
  • The motor lock signal remains HIGH for a predetermined continuous period of time while the motor is turning.
• Causes: Toner suction fan motor (FM7) Printer control board (PRCB)
• Remedy: 1 Check the FM8 connector for proper connection and correct as necessary. - - 2 Check the fan for possible overload and correct as necessary. - - 3 FM7 operation check PRCB CN15-1 (REM) PRCB CN15-3 (LOCK) K-8 4 Change FM7 - - 5 PRCB ICP6 conduction check - - 6 Change PRCB

• Code: C2353
• Description: IU cooling fan motor’s failure to turn
  • The motor lock signal remains HIGH for a predetermined continuous period of time while the motor is turning.
• Causes: IU cooling fan motor (FM15) PH relay board (REYB/PH) Printer control board (PRCB)
• Remedy: 1 Check the FM15 connector for proper connection and correct as necessary. - - 2 Check the fan for possible overload and correct as necessary. - - 3 FM15 operation check REYB/PH CN5-1 (REM) REYB/PH CN5-3 (LOCK) A to B-6 4 Change FM15 - - 5 REYB/PH ICP1 conduction check - - 6 Change REYB/PH - - 7 Change PRCB

• Code: C2354
• Description: Rear side cooling fan motor’s failure to turn
  • The motor lock signal remains HIGH for a predetermined continuous period of time while the motor is turning.
• Causes: Rear side cooling fan motor (FM16) Printer control board (PRCB)
• Remedy: 1 Check the FM16 connector for proper connection and correct as necessary. - - 2 Check the fan for possible overload and correct as necessary. - - 3 FM16 operation check PRCB CN18-2 (REM) PRCB CN18-3 (LOCK) C-12 to 13 4 Change FM16 - - 5 PRCB ICP7 conduction check - - 6 Change PRCB

• Code: C2551
• Description: Abnormally low toner density detected cyan TCR sensor
  • When sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the sub hopper.
• Causes: Imaging unit /C Imaging unit /M Imaging unit /Y Toner cartridge /C Toner cartridge /M Toner cartridge /Y Toner empty sensor/C (PZS/C) Toner empty sensor/M (PZS/M) Toner empty sensor/Y (PZS/Y) Toner supply motor/Y (M9) Toner supply motor/M (M10) Toner supply motor/C (M11) Toner cartridge motor Y/M (M13) Toner cartridge motor C/K (M14) Printer control board (PRCB)
• Remedy: 1 Perform image troubleshooting procedure if image density is low. - - 2 Clean the TCR sensor window on the underside of the imaging unit if dirty - - 3 Reinstall imaging unit - - 4 Reinstall toner cartridge - - 5 M9, M10, M11 operation check (At this time, IU must be non-installation.) M9: PRCB CN19-1 to 4 M10: PRCB CN19-5 to 8 M11: PRCB CN19-9 to 12 C-21 6 M13, M14 operation check M13: PRCB CN20-5 to 8 M14: PRCB CN20-9 to 12 K-6 7 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. - - 8 Change imaging unit - - 9 PRCB ICP1 or ICP2 conduction check - - 10 Change PRCB.

• Code: C2552
• Description: Abnormally high toner density detected cyan TCR sensor
  • TC ratio in the developing unit which is determined by Toner replenishing amount control mechanism, is a predetermined value or more for a given number of times consecutively.
• Causes: Imaging unit /C Imaging unit /M Imaging unit /Y Toner cartridge /C Toner cartridge /M Toner cartridge /Y Sub hopper unit Printer control board (PRCB)
• Remedy: 1 Reinstall toner cartridge - - 2 Reinstall imaging unit - - 3 Change imaging unit - - 4 PRCB ICP17 conduction check - - 5 Change PRCB - - 6 Change sub hopper unit

• Code: C2553
• Description: Abnormally low toner density detected magenta TCR sensor
  • When sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the sub hopper.
• Causes: Imaging unit /C Imaging unit /M Imaging unit /Y Toner cartridge /C Toner cartridge /M Toner cartridge /Y Toner empty sensor/C (PZS/C) Toner empty sensor/M (PZS/M) Toner empty sensor/Y (PZS/Y) Toner supply motor/Y (M9) Toner supply motor/M (M10) Toner supply motor/C (M11) Toner cartridge motor Y/M (M13) Toner cartridge motor C/K (M14) Printer control board (PRCB)
• Remedy: 1 Perform image troubleshooting procedure if image density is low. - - 2 Clean the TCR sensor window on the underside of the imaging unit if dirty - - 3 Reinstall imaging unit - - 4 Reinstall toner cartridge - - 5 M9, M10, M11 operation check (At this time, IU must be non-installation.) M9: PRCB CN19-1 to 4 M10: PRCB CN19-5 to 8 M11: PRCB CN19-9 to 12 C-21 6 M13, M14 operation check M13: PRCB CN20-5 to 8 M14: PRCB CN20-9 to 12 K-6 7 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. - - 8 Change imaging unit - - 9 PRCB ICP1 or ICP2 conduction check - - 10 Change PRCB.

• Code: C2554
• Description: Abnormally high toner density detected magenta TCR sensor
  • TC ratio in the developing unit, which is determined by toner replenishing amount control mechanism, is a predetermined value or more for a given number of times consecutively.
• Causes: Imaging unit /C Imaging unit /M Imaging unit /Y Toner cartridge /C Toner cartridge /M Toner cartridge /Y Sub hopper unit Printer control board (PRCB)
• Remedy: 1 Reinstall toner cartridge - - 2 Reinstall imaging unit - - 3 Change imaging unit - - 4 PRCB ICP17 conduction check - - 5 Change PRCB - - 6 Change sub hopper unit