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C255C (bizhub 750i)

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Trouble typeC255C: Black TCR sensor adjustment failure
RankB
Trouble detection conditionTCR 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/K (M25)
-Toner supply motor/K (M6)
-Expansion control board (EXCB)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Reinstall the developing unit/K.
  2. Check the connector between the developing unit/K-relay CN252-relay CN25-EXCB CN4EX for proper connection and correct as necessary.
  3. Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.
  4. Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.
  5. Check CPUB for proper installation and correct as necessary.
  6. M25 operation check
    • Control signal: EXCB CN11EX-1 to 4
    • Location of electrical component: 15-P
  7. M6 operation check
    • Control signal: EXCB CN10EX-16 to 19
    • Location of electrical component: 23-P
  8. Replace the developing unit/K. (Part# ACV803D)
  9. Replace EXCB. (Part# AC74H00501)
  10. Replace CPUB. (Part# ACV7H02P02)
  11. Replace BASEB. (Part# ACV7H02101)

(Link to the Field Service Manual)

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