C255C (bizhub 658e/558e/458e)

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Trouble typeC255C: Black TCR sensor adjustment failure
RankB
Trouble detection conditionTCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
Trouble isolation–
Relevant electrical parts• Developing unit
• Toner cartridge motor/K (M25)
• Toner supply motor/K (M6)
• Expansion control board (EXCB)
• Front side board (FRB)
• MFP board (MFPB)

 Procedure

  1. Reinstall the developing unit.
  2. Check the connector between the developing unit-FRB CN13 for proper connection and correct as necessary.
  3. Check the connector between FRB CN1, CN3-MFPB CN4E, CN5E for proper connection and correct as necessary.
  4. M25 operation check
    • Control signal: MFPB CN28E-4 to 7
    • Location of electrical component: 11 to 12-C
  5. M6 operation check
    • Control signal: EXCB CN3-4 to 7
    • Location of electrical component: 26-T
  6. Replace the developing unit. (Part# A9C803D)
  7. Replace FRB. (Part# A9HJH00501)
  8. Replace EXCB. (Part# A9HGH00501)
  9. Replace MFPB. (658e/558e Part# AA6RH02103 / 458e Part# AA6UH02101)

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

L.3.10.6 (Link to the Field Service Manual)