C2552, C2554, C2556, C2558 (bizhub C750i)
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Contents
| Trouble type | C2552: Abnormally high toner density detected cyan TCR sensor C2554: Abnormally high toner density detected magenta TCR sensor C2556: Abnormally high toner density detected yellow TCR sensor 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/C,M,Y,K -Toner cartridge/C,M,Y,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/C-relay CN251-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C2552)
- Check the connector between the developing unit/M-relay CN250-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C2554)
- Check the connector between the developing unit/Y-relay CN249-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C2556)
- Check the connector between the developing unit/K-relay CN252-relay CN25-EXCB CN4EX for proper connection and correct as necessary. (C2558)
- 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.
(C Part# ACV80KD, M Part# ACV80ED, Y Part# ACV808D, K Part# ACV803D) - Replace EXCB. (Part# AA7NH00500)
- Replace CPUB. (Part# ACKNH02P03)
- Replace BASEB. (Part# ACKNH02101)