• Code: C255C
• Description: Black TCR sensor adjustment failure
  TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
• Causes: • Developing unit /K • Printer control board (PRCB)
• Remedy: 1 Reinstall the developing unit/K. 2 Replace the developing unit /K. 3 PRCB ICP23 or ICP24 conduction check. 4 Replace 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.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Developing unit /K • PH relay board (PHRYB) • Printer control board (PRCB)
• Remedy: 1 • Reinstall the imaging unit /C,/M, /Y • Reinstall the developing unit /K. 2 Check the harness from imaging unit /C, /M, /Y and developing unit /K to PRCB CN2, 3, 4, 5 for proper connection and correct as necessary. • CN2: Developing unit /K • CN3: Imaging unit /C • CN4, CN5: Imaging unit /M, Imaging unit /Y - - 3 • Replace the imaging unit. • Replace the developing unit /K. 4 PRCB ICP 17 conduction check. 5 Replace PHRYB. 6 Replace PRCB.

• Code: C2562
• Description: Magenta 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.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Developing unit /K • PH relay board (PHRYB) • Printer control board (PRCB)
• Remedy: 1 • Reinstall the imaging unit /C,/M, /Y • Reinstall the developing unit /K. 2 Check the harness from imaging unit /C, /M, /Y and developing unit /K to PRCB CN2, 3, 4, 5 for proper connection and correct as necessary. • CN2: Developing unit /K • CN3: Imaging unit /C • CN4, CN5: Imaging unit /M, Imaging unit /Y - - 3 • Replace the imaging unit. • Replace the developing unit /K. 4 PRCB ICP 17 conduction check. 5 Replace PHRYB. 6 Replace PRCB.

• Code: C2563
• Description: Yellow 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.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Developing unit /K • PH relay board (PHRYB) • Printer control board (PRCB)
• Remedy: 1 • Reinstall the imaging unit /C,/M, /Y • Reinstall the developing unit /K. 2 Check the harness from imaging unit /C, /M, /Y and developing unit /K to PRCB CN2, 3, 4, 5 for proper connection and correct as necessary. • CN2: Developing unit /K • CN3: Imaging unit /C • CN4, CN5: Imaging unit /M, Imaging unit /Y - - 3 • Replace the imaging unit. • Replace the developing unit /K. 4 PRCB ICP 17 conduction check. 5 Replace PHRYB. 6 Replace PRCB.

• Code: C2564
• Description: Black 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.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Developing unit /K • PH relay board (PHRYB) • Printer control board (PRCB)
• Remedy: 1 • Reinstall the imaging unit /C,/M, /Y • Reinstall the developing unit /K. 2 Check the harness from imaging unit /C, /M, /Y and developing unit /K to PRCB CN2, 3, 4, 5 for proper connection and correct as necessary. • CN2: Developing unit /K • CN3: Imaging unit /C • CN4, CN5: Imaging unit /M, Imaging unit /Y - - 3 • Replace the imaging unit. • Replace the developing unit /K. 4 PRCB ICP 17 conduction check. 5 Replace PHRYB. 6 Replace PRCB.

• Code: C2650
• Description: Main backup media access error
  • The re-written data, which has been read out, checked and founded as error, is read out again and found as error. • The error was found when reading out the counter value. • MFP detects that the SSD board is not mounted.
• Causes: • SSD board (SSDB) • MFP board (MFPB) • Printer control board (PRCB)
• Remedy: 1 Check the connector from SSDB to MFPB for proper connection and correct as necessary. 2 Check the harness from MFPB to PRCB for proper connection and correct as necessary. 3 Replace MFPB 4 Replace PRCB 4.1. Check that the trouble code C4802 appears and then display service mode. 4.2. Call the Enhanced Security to the screen. 4.3. Touch [Engine Data Backup]. 4.4. Touch [Engine Data Load mode], and press the Start key. 4.5. Select [Yes], and press the Start key again. 4.6. Check that the result “OK” appears. 4.7. Turn OFF the main power switch and turn it ON again more than 10 seconds after. 4.8. Update the PRCB firmware. 4.9. Make the specified readjustments. 4 If the above actions do not solve the problem, contact KMBT.

• Code: C2651
• Description: EEPROM access error (IU C)
  • The re-written data, which has been read out, checked and founded as error, is read out again and found as error. • The error was found when reading out the counter value.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Printer control board (PRCB)
• Remedy: 1 Clean the connection between the imaging unit and the machine if dirty. 2 Reinstall the imaging unit. 3 Check the harness for proper connection and correct as necessary. 4 Replace the imaging unit. 5 Replace PRCB.

• Code: C2652
• Description: EEPROM access error (IU M)
  • The re-written data, which has been read out, checked and founded as error, is read out again and found as error. • The error was found when reading out the counter value.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Printer control board (PRCB)
• Remedy: 1 Clean the connection between the imaging unit and the machine if dirty. 2 Reinstall the imaging unit. 3 Check the harness for proper connection and correct as necessary. 4 Replace the imaging unit. 5 Replace PRCB.