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C2559, C255A, C255B (bizhub 750i)

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Trouble typeC2559: Cyan TCR sensor adjustment failure

C255A: Magenta TCR sensor adjustment failure

C255B: Yellow 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/C,M,Y
-Toner cartridge motor/YM (M10)
-Toner cartridge motor/CK (M25)
-Toner supply motor/Y (M9)
-Toner supply motor/M (M8)
-Toner supply motor/C (M7)
-Expansion control board (EXCB)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Reinstall the developing unit.
  2. Check the connector between the developing unit/C-relay CN251-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C2559)
  3. Check the connector between the developing unit/M-relay CN250-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C255A)
  4. Check the connector between the developing unit/Y-relay CN249-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C255B)
  5. Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.
  6. Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.
  7. Check CPUB for proper installation and correct as necessary.
  8. M10, M25 operation check
    • Control signal: EXCB CN11EX-5 to 8 (M10), EXCB CN11EX-1 to 4 (M25)
    • Location of electrical component: 15-P
  9. M7, M8, M9 operation check
    • Control signal: EXCB CN11EX-17 to 20 (M7), EXCB CN11EX-13 to 16 (M8), EXCB CN11EX-9 to 12 (M9)
    • Location of electrical component: 16-P
  10. Replace the corresponding developing unit.
    (C Part# ACV80KD, M Part# ACV80ED, Y Part# ACV808D, K Part# ACV803D)
  11. Replace EXCB. (Part# AA7NH00500)
  12. Replace CPUB. (Part# ACKNH02P03)
  13. Replace BASEB. (Part# ACKNH02101)

(Link to the Field Service Manual)

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