• 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-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. 3 Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. 4 M10 operation check PRCB CN14-17 to 20 18-C. 5 M6, M7, M8, M9 operation check PRCB CN14-13 to 16 (M6) PRCB CN14-9 to 12 (M7) 17 to 18-C. 6 Replace the developing unit. 7 Replace FRB. 8 PRCB ICP21, ICP40, ICP43, ICP44, ICP46 conduction check. 9 Replace 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-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. 3 Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. 4 M10 operation check PRCB CN14-17 to 20 18-C. 5 M6, M7, M8, M9 operation check PRCB CN14-13 to 16 (M6) PRCB CN14-9 to 12 (M7) 17 to 18-C. 6 Replace the developing unit. 7 Replace FRB. 8 PRCB ICP21, ICP40, ICP43, ICP44, ICP46 conduction check. 9 Replace 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-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. 3 Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. 4 M10 operation check PRCB CN14-17 to 20 18-C. 5 M6, M7, M8, M9 operation check PRCB CN14-13 to 16 (M6) PRCB CN14-9 to 12 (M7) 17 to 18-C. 6 Replace the developing unit. 7 Replace FRB. 8 PRCB ICP21, ICP40, ICP43, ICP44, ICP46 conduction check. 9 Replace PRCB.

• Code: C2561
• Description: Cyan TCR sensor 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-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. 3 Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. 4 Replace the developing unit. 5 Replace FRB. 6 Replace PRCB.

• Code: C2562
• Description: Magenta TCR sensor 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-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. 3 Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. 4 Replace the developing unit. 5 Replace FRB. 6 Replace PRCB.

• Code: C2563
• Description: Yellow TCR sensor 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-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. 3 Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. 4 Replace the developing unit. 5 Replace FRB. 6 Replace PRCB.

• Code: C2564
• Description: Black TCR sensor 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-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. 3 Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. 4 Replace the developing unit. 5 Replace FRB. 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.
• 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. 5 If the above actions do not solve the problem, contact KMBT.