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C2551 (bizhub C360i/C300i/C250i)

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Trouble typeC2551: Abnormally low toner density detected cyan TCR sensor
RankB
Trouble detection conditionWhen sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the sub hopper.
Trouble isolation–
Relevant electrical parts• Developing unit/C,M,Y
• Toner cartridge/C,M,YPH unit
• Toner empty sensor/Y (PS34)
• Toner empty sensor/M (PS33)
• Toner empty sensor/C (PS32)
• 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. Perform image troubleshooting procedure if image density is low.
  2. Reinstall the developing unit.
  3. Reinstall the toner cartridge.
  4. Check the connector between the developing unit/C-relay CN251-relay CN248-EXCB CN6EX for proper connection and correct as necessary.
  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: 4-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: 5-P (M7), 4-P (M8, M9)
  10. If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them.
  11. Replace the corresponding developing unit.
  12. Replace EXCB. (Part# AA2JH00500)
  13. Replace CPUB. (Part# AA2JH02N06)
  14. 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.3.8.7 (Link to the Field Service Manual)

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