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C2558 (bizhub 750i)
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Contents
Trouble type | C2558: Abnormally high toner density detected black TCR sensor |
Rank | B |
Trouble detection condition | The 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
- Reinstall the developing unit.
- Reinstall the toner cartridge.
- Check the connector between the developing unit/K-relay CN252-relay CN25-EXCB CN4EX for proper connection and correct as necessary.
- Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.
- Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.
- Check CPUB for proper installation and correct as necessary.
- Replace the corresponding developing unit. (Part# ACV803D)
- Replace EXCB. (Part# AC74H00501)
- Replace CPUB. (Part# ACV7H02P02)
- Replace BASEB. (Part# ACV7H02101)