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C2558 (bizhub 950i/850i)

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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
– CPU board (CPUB)
– Base board (BASEB)

Procedure

  1. Reinstall the developing unit.
  2. Check CPUB for proper installation and correct as necessary.
  3. Reinstall the toner cartridge.
  4. Replace the developing unit.
  5. Replace CPUB.
  6. Replace BASEB.
  7. Replace the sub hopper unit.

(Link to the Field Service Manual)

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