C2558 (bizhub 750i)

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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/K
-Toner cartridge/K
-Expansion control board (EXCB)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Reinstall the developing unit.
  2. Reinstall the toner cartridge.
  3. Check the connector between the developing unit/K-relay CN252-relay CN25-EXCB CN4EX for proper connection and correct as necessary.
  4. Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.
  5. Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.
  6. Check CPUB for proper installation and correct as necessary.
  7. Replace the corresponding developing unit. (Part# ACV803D)
  8. Replace EXCB. (Part# AC74H00501)
  9. Replace CPUB. (Part# ACV7H02P02)
  10. Replace BASEB. (Part# ACV7H02101)

(Link to the Field Service Manual)