• Code: C2555
• Description: Abnormally low toner density detected yellow TCR sensor
  • TC ratio in the developing machine, which is determined by toner replenishing amount control mechanism, is 4 % or less for a given number of times consecutively. • When the connector of the TCR sensor is disconnected.
• Remedy: 1 Reinstall imaging unit. 2 Reinstall toner cartridge. 3 M3, M4 operation check (At this time, IU must be non-installation.) PRCB CN39PRCB-1 to 4 (M3) PRCB CN39PRCB-5 to 8 (M4) D-23. 4 Change imaging unit. 5 Change PRCB.

• Code: C2556
• Description: Abnormally high toner density detected yellow TCR sensor
  • TC ratio in the developing machine, which is determined by toner replenishing amount control mechanism, is 11 % or more for a given number of times consecutively. • When the connector of the TCR sensor is disconnected.
• Remedy: 1 Reinstall imaging unit. 2 Reinstall toner cartridge. 3 Change imaging unit. 4 Change PRCB.

• Code: C2557
• Description: Abnormally low toner density detected black TCR sensor
  • TC ratio in the developing machine, which is determined by toner replenishing amount control mechanism, is 4 % or less for a given number of times consecutively.
• Remedy: 1 M3 operation check (At this time, IU must be non-installation.) PRCB CN39PRCB-1 to 4 D-23. 2 Reinstall imaging unit. 3 Reinstall toner cartridge. 4 Change imaging unit /K. 5 Change PRCB.

• Code: C2558
• Description: Abnormally high toner density detected black TCR sensor
  • TC ratio in the developing machine, which is determined by toner replenishing amount control mechanism, is 11 % or more for a given number of times consecutively. • When the connector of the TCR sensor is disconnected.
• Remedy: 1 Reinstall imaging unit. 2 Reinstall toner cartridge. 3 Change imaging unit /K. 4 Change PRCB.

• 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 Reinstall imaging unit. 2 Change imaging unit. 3 Change PRCB.

• Code: C255A
• Description: Magenta TCR sensor adjustment failure
  • TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
• Remedy: 1 Reinstall imaging unit. 2 Change imaging unit. 3 Change PRCB.

• Code: C255B
• Description: Yellow TCR sensor adjustment failure
  • TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
• Remedy: 1 Reinstall imaging unit. 2 Change imaging unit. 3 Change PRCB.

• Code: C255C
• Description: Black TCR sensor adjustment failure
  • TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
• Remedy: 1 Reinstall imaging unit /K. 2 Change imaging unit /K. 3 Change PRCB.