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C255C (bizhub C750i)
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Contents
Trouble type | C255C: Black TCR sensor adjustment failure |
Rank | B |
Trouble detection condition | TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value. |
Trouble isolation | – |
Relevant electrical parts | -Developing unit/K -Toner cartridge motor/CK (M25) -Toner supply motor/K (M6) -Expansion control board (EXCB) -CPU board (CPUB) -Base board (BASEB) |
Procedure
- Reinstall the developing unit/K.
- 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.
- M25 operation check
- Control signal: EXCB CN11EX-1 to 4
- Location of electrical component: 15-P
- M6 operation check
- Control signal: EXCB CN10EX-16 to 19
- Location of electrical component: 23-P
- Replace the developing unit/K. (Part# ACV803D)
- Replace EXCB. (Part# AA7NH00500)
- Replace CPUB. (Part# ACKNH02P03)
- Replace BASEB. (Part# ACKNH02101)