• Code: C2553
• Description: Abnormally low toner density detected Magenta TCR Sensor
  • T/C 0.21 % or less is detected ten consecutive times in the Developing Unit as validated through the toner replenishing amount determination control.
• 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 Correct the TCR Sensor spring moving part if faulty. 4 Clean the TCR Sensor LED if dirty. 5 Change TCR Sensor C/M/Y. 6 M3, M4 operation check PWB-MC PJ8MC-1 to 4 PWB-MC PJ8MC-5 to 8. 7 Change Imaging Unit. 8 Change PWB-MC. 9 Change PWB-MFPC.

• Code: C2554
• Description: Abnormally high toner density detected Magenta TCR Sensor
  • T/C 15.5 % or more is detected ten consecutive times in the Developing Unit as validated through the toner replenishing amount determination control.
• Remedy: 1 Clean the TCR Sensor window on the underside of the Imaging Unit if dirty 2 Clean the TCR Sensor LED if dirty. 3 Correct the contact and/or WIRING of the TCR Sensor if faulty. 4 Change TCR Sensor C/M/Y. 5 Change Imaging Unit. 6 Change PWB-MC. 7 Change PWB-MFPC.

• Code: C2555
• Description: Abnormally low toner density detected Yellow TCR Sensor
  • T/C 0.21 % or less is detected ten consecutive times in the Developing Unit as validated through the toner replenishing amount determination control.
• 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 Correct the TCR Sensor spring moving part if faulty. 4 Clean the TCR Sensor LED if dirty. 5 Change TCR Sensor C/M/Y. 6 M3, M4 operation check PWB-MC PJ8MC-1 to 4 PWB-MC PJ8MC-5 to 8. 7 Change Imaging Unit. 8 Change PWB-MC. 9 Change PWB-MFPC.

• Code: C2556
• Description: Abnormally high toner density detected Yellow TCR Sensor
  • T/C 15.5 % or more is detected ten consecutive times in the Developing Unit as validated through the toner replenishing amount determination control.
• Remedy: 1 Clean the TCR Sensor window on the underside of the Imaging Unit if dirty 2 Clean the TCR Sensor LED if dirty. 3 Correct the contact and/or WIRING of the TCR Sensor if faulty. 4 Change TCR Sensor C/M/Y. 5 Change Imaging Unit. 6 Change PWB-MC. 7 Change PWB-MFPC.

• Code: C2557
• Description: Abnormally low toner density detected Black TCR Sensor
  • T/C 3 % or less is detected ten consecutive times in the Developing Unit as validated through the toner replenishing amount determination control.
• Remedy: 1 Perform image troubleshooting procedure if image density is low. 2 M3 operation check PWB-MC PJ8MC-1 to 4 C to D-14 3 Change Imaging Unit. 4 Change PWB-MC. 5 Change PWB-MFPC.

• Code: C2558
• Description: Abnormally high toner density detected Black TCR Sensor
  • T/C 12 % or more is detected ten consecutive times in the Developing Unit as validated through the toner replenishing amount determination control.
• Remedy: 1 Correct the TCR connection on the underside of the Imaging Unit if faulty. 2 Clean or correct each contact of the Imaging Unit if faulty. 3 Change Imaging Unit. 4 Change PWB-MC. 5 Change PWB-MFPC.

• 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 Clean the TCR Sensor LED if dirty. 3 Correct the contact and/or WIRING of the TCR Sensor if faulty. 4 Reinstall Imaging Unit C/M/Y. 5 M3, M4 operation check PWB-MC PJ8MC-1 to 4 PWB-MC PJ8MC-5 to 8 C to D-14. 6 Change Imaging Unit. 7 Change PWB-MC. 8 Change PWB-MFPC.

• 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 Clean the TCR Sensor LED if dirty. 3 Correct the contact and/or WIRING of the TCR Sensor if faulty. 4 Reinstall Imaging Unit C/M/Y. 5 M3, M4 operation check PWB-MC PJ8MC-1 to 4 PWB-MC PJ8MC-5 to 8 C to D-14. 6 Change Imaging Unit. 7 Change PWB-MC. 8 Change PWB-MFPC.