C2557 (bizhub C360i/C300i/C250i)

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Trouble typeC2557: Abnormally low toner density detected black 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/K
• Toner cartridge/K
• PH unit
• Toner empty sensor/K (PS31)
• Toner cartridge motor/CK (M25)
• Toner supply motor/K (M6)
• 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/K.
  3. Reinstall the toner cartridge/K.
  4. Check the connector between the developing unit/K-relay CN252-relay CN25-EXCB CN4EX 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. M25 operation check
    • Control signal: EXCB CN11EX-1 to 4
    • Location of electrical component: 4-P
  9. M6 operation check
    • Control signal: EXCB CN10EX-16 to 19
    • Location of electrical component: 11-P
  10. If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them.
  11. Replace the developing unit/K.
  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.3.8.9 (Link to the Field Service Manual)