• 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.
• 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 CN16PRCB-1 to 4 M10: PRCB CN16PRCB-5 to 8 M11: PRCB CN16PRCB-9 to 12 C-22 to 23. 6 M13, M14 operation check M13: PRCB CN17PRCB-5 to 8 M14: PRCB CN17PRCB-9 to 12 K-1. 7 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. 8 Change imaging unit. 9 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.
• Remedy: 1 Clean the TCR sensor window on the underside of the imaging unit if dirty. 2 Reinstall imaging unit. 3 Reinstall toner cartridge. 4 Change imaging unit. 5 Change PRCB. 6 Change sub hopper unit.

• 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.
• 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 CN16PRCB-1 to 4 M10: PRCB CN16PRCB-5 to 8 M11: PRCB CN16PRCB-9 to 12 C-22 to 23. 6 M13, M14 operation check M13: PRCB CN17PRCB-5 to 8 M14: PRCB CN17PRCB-9 to 12 K-1. 7 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. 8 Change imaging unit. 9 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.
• Remedy: 1 Clean the TCR sensor window on the underside of the imaging unit if dirty. 2 Reinstall imaging unit. 3 Reinstall toner cartridge. 4 Change imaging unit. 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.
• 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 M12 operation check (At this time, IU must be non-installation.) PRCB CN16PRCB-13 to 16 C-22 4 M14 operation check PRCB CN17PRCB-9 to 12 K-1. 5 Reinstall imaging unit. 6 Reinstall toner cartridge. 7 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. 8 Change imaging unit /K. 9 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.
• Remedy: 1 Correct the TCR connection on the underside of the imaging unit if faulty. 2 Reinstall imaging unit. 3 Reinstall toner cartridge. 4 Change imaging unit. 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.
• Remedy: 1 Clean the TCR sensor window on the underside of the imaging unit if dirty. 2 M9, M10, M11 operation check M9: PRCB CN16PRCB-1 to 4 M10: PRCB CN16PRCB-5 to 8 M11: PRCB CN16PRCB-9 to 12 C-22 to 23. 3 Reinstall imaging unit. 4 Change imaging unit. 5 Change PRCB.

• Code: C255A
• Description: Magenta TCR sensor adjustment failure
• Remedy: 1 Clean the TCR sensor window on the underside of the imaging unit if dirty. 2 M9, M10, M11 operation check M9: PRCB CN16PRCB-1 to 4 M10: PRCB CN16PRCB-5 to 8 M11: PRCB CN16PRCB-9 to 12 C-22 to 23. 3 Reinstall imaging unit. 4 Change imaging unit. 5 Change PRCB.