• Code: C2555
• Description: Abnormally low toner density detected yellow 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: C2556
• Description: Abnormally high toner density detected yellow 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: C2557
• Description: Abnormally low toner density detected black 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: Drum unit /K Toner cartridge /K Toner empty sensor/K (PZS/K) Toner supply motor/K (M12) Toner cartridge motor C/K (M14) Printer control board (PRCB)
• Remedy: 1 Perform image troubleshooting procedure if image density is low. - - 2 M12 operation check (At this time, IU must be non-installation.) PRCB CN19-13 to 16 C-20 3 M14 operation check PRCB CN20-9 to 12 K-6 4 Reinstall drum unit/K - - 5 Reinstall toner cartridge - - 6 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. - - 7 Change drum unit /K - - 8 Change PRCB.

• Code: C2558
• Description: Abnormally high toner density detected black 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: Drum unit /K Toner cartridge /K Sub hopper unit Printer control board (PRCB)
• Remedy: 1 Reinstall drum unit/K - - 2 Reinstall toner cartridge - - 3 Change drum unit/K - - 4 PRCB ICP17 conduction check - - 5 Change PRCB - - 6 Change sub hopper unit

• Code: C2559
• Description: Cyan TCR sensor adjustment failure
  • TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
• Causes: Imaging unit /C Imaging unit /M Imaging unit /Y Printer control board (PRCB)
• Remedy: 1 Reinstall imaging unit - - 2 Change imaging unit - - 3 PRCB ICP1 or ICP2 conduction check - - 4 PRCB ICP17 conduction check - - 5 Change PRCB

• Code: C255A
• Description: Magenta TCR sensor adjustment failure
• Causes: Imaging unit /C Imaging unit /M Imaging unit /Y Printer control board (PRCB)
• Remedy: 1 Reinstall imaging unit - - 2 Change imaging unit - - 3 PRCB ICP1 or ICP2 conduction check - - 4 PRCB ICP17 conduction check - - 5 Change PRCB

• Code: C255B
• Description: Yellow TCR sensor adjustment failure
• Causes: Imaging unit /C Imaging unit /M Imaging unit /Y Printer control board (PRCB)
• Remedy: 1 Reinstall imaging unit - - 2 Change imaging unit - - 3 PRCB ICP1 or ICP2 conduction check - - 4 PRCB ICP17 conduction check - - 5 Change PRCB

• Code: C255C
• Description: Black TCR sensor adjustment failure
• Causes: Drum unit /K Printer control board (PRCB)
• Remedy: 1 Reinstall drum unit /K - - 2 Change drum unit /K - - 3 PRCB ICP17 conduction check - - 4 Change PRCB