C255B (bizhub C658/C558/C458)

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Trouble typeC255B: Yellow 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/C,M,Y,K 
• Toner cartridge motor/Y,M (M10) 
• Toner cartridge motor/C,K (M25) 
• Toner supply motor/Y (M9) 
• Toner supply motor/M (M8) 
• Toner supply motor/C (M7) 
• 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 (C255C), CN14 (C2559), CN15 (C255A), CN16 (C255B) 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. M10, M25 operation check
    • Control signal: MFPB CN28E-8 to 11 (M10), CN28E-4 to 7 (M25)
    • Location of electrical component: 12-C (M10), 11-C (M25)
  5. M6, M7, M8, M9 operation check
    • Control signal: EXCB CN3-4 to 7 (M6), CN3-8 to 11 (M7), CN3-12 to 15 (M8), CN3-16 to 19 (M9)
    • Location of electrical component: 15-C (M7, M8), 16-C (M9)
  6. Replace the developing unit. (C Part# A9C80KD, M Part# A9C80ED, Y Part# A9C808D , K Part# A9C803D)
  7. Replace FRB. (Part# A7PUH00500)
  8. Replace EXCB. (Part# A79JH00500)
  9. Replace MFPB. (C458 Part# A79MH02102 / C558 or C658 Part # A79JH02102)

NOTICE

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

K.3.12.9 (Link to the Field Service Manual)