C2558 (bizhub 958/808)

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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
• Sub hopper unit
• MFP board (MFPB)

 Procedure

  1. Reinstall developing unit.
  2. Reinstall the toner cartridge. (Part# A8H5030)
  3. Replace the developing unit. (Part# A8H403D)
  4. Replace MFPB. (Part# A796H02003)
  5. Replace the sub hopper unit. (Part# A55VR70311)

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

K.3.8.14 (Link to the Field Service Manual)