C2558 (bizhub 558/458)

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Trouble typeC2558: Abnormally high toner density detected black TCR sensor
RankB
Trouble detection conditionThe TC ratio of the toner determined by the toner replenishment control is detected to be the predetermined value or over for consecutive times.
Trouble isolation–
Relevant electrical parts• Developing unit
• Toner cartridge
• Front side board (FRB)
• MFP board (MFPB)

 Procedure

  1. Reinstall the developing unit.
  2. Reinstall the toner cartridge.
  3. Check the connector between the developing unit-FRB CN13 for proper connection and correct as necessary.
  4. Check the connector between FRB CN1, CN3-MFPB CN4E, CN5E for proper connection and correct as necessary.
  5. Replace the developing unit. (Part# A9C803D)
  6. Replace FRB. (Part# A9HJH00501)
  7. Replace MFPB. (558 Part# A9HGH02102 / 458 Part# A9HHH02102)

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

K.3.11.5 (Link to the Field Service Manual)