• 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 Reinstall developing unit. 2 Reinstall toner cartridge. 3 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 4 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 5 Change developing unit. 6 Change FREYB. 7 PRCB ICP12 conduction check. 8 Change PRCB.

• 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 Reinstall developing unit. 3 Reinstall toner cartridge. 4 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 5 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 6 M6, M7 operation check PRCB CN13-12 to 15 (M6) PRCB CN13-16 to 19 (M7) J-21 7 M8, M9 operation check PRCB CN12-9 to 12 (M8) PRCB CN12-13 to 16 (M9) J-10 8 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. 9 Change developing unit. 10 Change FREYB. 11 PRCB ICP3,4 conduction check. 12 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 Reinstall developing unit. 2 Reinstall toner cartridge. 3 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 4 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 5 Change developing unit. 6 Change FREYB. 7 PRCB ICP12 conduction check. 8 Change PRCB.

• Code: C2559
• Description: Cyan TCR sensor adjustment failure
• Remedy: 1 Reinstall developing unit. 2 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 3 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 4 M6, M7 operation check PRCB CN13-12 to 15 (M6) PRCB CN13-16 to 19 (M7) J-21 5 M8, M9 operation check PRCB CN12-9 to 12 (M8) PRCB CN12-13 to 16 (M9) J-10 6 Change developing unit. 7 Change FREYB. 8 PRCB ICP3,4,12 conduction check. 9 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 developing unit. 2 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 3 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 4 M6, M7 operation check PRCB CN13-12 to 15 (M6) PRCB CN13-16 to 19 (M7) J-21 5 M8, M9 operation check PRCB CN12-9 to 12 (M8) PRCB CN12-13 to 16 (M9) J-10 6 Change developing unit. 7 Change FREYB. 8 PRCB ICP3,4,12 conduction check. 9 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 developing unit. 2 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 3 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 4 M6, M7 operation check PRCB CN13-12 to 15 (M6) PRCB CN13-16 to 19 (M7) J-21 5 M8, M9 operation check PRCB CN12-9 to 12 (M8) PRCB CN12-13 to 16 (M9) J-10 6 Change developing unit. 7 Change FREYB. 8 PRCB ICP3,4,12 conduction check. 9 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 developing unit. 2 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 3 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 4 M6, M7 operation check PRCB CN13-12 to 15 (M6) PRCB CN13-16 to 19 (M7) J-21 5 M8, M9 operation check PRCB CN12-9 to 12 (M8) PRCB CN12-13 to 16 (M9) J-10 6 Change developing unit. 7 Change FREYB. 8 PRCB ICP3,4,12 conduction check. 9 Change PRCB.

• Code: C2561
• Description: Cyan TCR sensor failure
  • Alarm signals for a TCR sensor are detected more than the predetermined number of times. This detection is used for detecting disconnection of TCR sensor connector.
• Remedy: 1 Reinstall developing unit. 2 Check the connector between developing unit-FREYB CN4, CN6, CN8, CN10 for proper connection and correct as necessary. 3 Check the connector between FREYB CN1, CN2-PRCB CN4, CN5 for proper connection and correct as necessary. 4 Change developing unit. 5 Change FREYB. 6 Change PRCB.