• Code: C2552
• Description: Abnormally high toner density detected Cyan TCR Sensor
  • TC ratio in the developing machine, which is determined by Toner replenishing amount control mechanism, is 12 % 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 Change Imaging Unit. 4 Change PWB-M. 5 Change PWB-MFP.

• Code: C2553
• Description: Abnormally low toner density detected Magenta TCR Sensor
  • TC ratio in the developing machine, which is determined by Toner replenishing amount control mechanism, is 5 % or less for a given number of times consecutively.
• 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 M6, M7 operation check PWB-M CNDM2-10 to 13 (M6) PWB-M CNDM3-10 to 13 (M7) C-20 C-21. 4 Reinstall Imaging Unit. 5 Change Imaging Unit. 6 Change PWB-M. 7 Change PWB-MFP.

• Code: C2554
• Description: Abnormally high toner density detected Magenta TCR Sensor
  • TC ratio in the developing machine, which is determined by Toner replenishing amount control mechanism, is 12 % 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 Change Imaging Unit. 4 Change PWB-M. 5 Change PWB-MFP.

• 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 5 % or less for a given number of times consecutively.
• 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 M6, M7 operation check PWB-M CNDM2-10 to 13 (M6) PWB-M CNDM3-10 to 13 (M7) C-20 C-21. 4 Reinstall Imaging Unit. 5 Change Imaging Unit. 6 Change PWB-M. 7 Change PWB-MFP.

• 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 12 % 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 Change Imaging Unit. 4 Change PWB-M. 5 Change PWB-MFP.

• 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 5 % or less for a given number of times consecutively.
• 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 M7 operation check PWB-M CNDM3-10 to 13 C-21 4 Reinstall Imaging Unit. 5 Change Imaging Unit /K. 6 Change PWB-M. 7 Change PWB-MFP.

• 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 12 % 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 Change Imaging Unit. 4 Change PWB-M. 5 Change PWB-MFP.

• 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 M6, M7 operation check PWB-M CNDM2-10 to 13 (M6) PWB-M CNDM3-10 to 13 (M7) C-20 C-21. 3 Reinstall Imaging Unit. 4 Change Imaging Unit. 5 Change PWB-M. 6 Change PWB-MFP.