C255B (bizhub C360i/C300i/C250i)

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Trouble typeC255B: 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.
  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. M10, M25 operation check
    • Control signal: EXCB CN11EX-5 to 8 (M10), EXCB CN11EX-1 to 4 (M25)
    • Location of electrical component: 4-P
  7. 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: 5-P (M7), 4-P (M8, M9)
  8. Replace the corresponding developing unit.
  9. Replace EXCB. (Part# AA2JH00500)
  10. Replace CPUB. (Part# AA2JH02N06)
  11. Replace BASEB. (Part# AA2JH02005)

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

L.3.8.10 (Link to the Field Service Manual)