C2553 (bizhub C368/C308/C258)

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Trouble typeC2553: Abnormally low toner density detected magenta 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,Y 
• Toner empty sensor/Y (PS34) 
• Toner empty sensor/M (PS33) 
• Toner empty sensor/C (PS32) 
• Toner cartridge motor/Y,M,C (M10) 
• Toner supply motor/Y (M9) 
• Toner supply motor/M (M8) 
• Toner supply motor/C (M7) 
• Front side board (FRB) 
• MFP board (MFPB)

 Procedure

  1. Perform image troubleshooting procedure if image density is low.
  2. Reinstall developing unit.
  3. Reinstall toner cartridge.
  4. Check the connector between the developing unit-FRB CN14 (C2551), CN15 (C2553), CN16 (C2555) for proper connection and correct as necessary.
  5. Check the connector between FRB CN1, CN3-MFPB CN4E, CN11E for proper connection and correct as necessary.
  6. M10 operation check
    • Control signal: MFPB CN16E-1 to 4
    • Location of electrical component: 15-C
  7. M7, M8, M9 operation check
    • Control signal: MFPB CN16E-5 to 8 (M7), MFPB CN16E-9 to 12 (M8), MFPB CN16E-13 to 16 (M9)
    • Location of electrical component: 15-C (M7, M8), 16-C (M9)
  8. If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them.
  9. Replace the developing unit. (Part# A7U40ED.)
  10. Replace FRB. (Part# A7PUH00500)
  11. Replace MFPB. (Part# A7PUH02123)

NOTICE

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

K.3.11.6 (Link to the Field Service Manual)