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C2557 (bizhub C658/C558/C458)
Contents
Trouble type | C2557: Abnormally low toner density detected black TCR sensor |
Rank | B |
Trouble detection condition | When 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,K • Toner cartridge/C,M,Y,K • Toner empty sensor/Y (PS34) • Toner empty sensor/M (PS33)Toner empty sensor/C (PS32) • Toner empty sensor/K (PS31) • Toner cartridge motor/Y,M (M10) • Toner cartridge motor/C,K (M25) • Toner supply motor/Y (M9) • Toner supply motor/M (M8) • Toner supply motor/C (M7) • Toner supply motor/K (M6) • Expansion control board (EXCB) • Front side board (FRB) • MFP board (MFPB) |
Procedure
- Perform image troubleshooting procedure if image density is low.
- Reinstall the developing unit.
- Reinstall the toner cartridge.
- Check the connector between the developing unit-FRB CN13 (C2557), CN14 (C2551), CN15 (C2553), CN16 (C2555) for proper connection and correct as necessary.
- Check the connector between FRB CN1, CN3-MFPB CN4E, CN5E for proper connection and correct as necessary.
- M10, M25 operation check
- Control signal: MFPB CN28E-8 to 11 (M10), CN28E-4 to 7 (M25)
- Location of electrical component: 12-C (M10), 11-C (M25)
- M6, M7, M8, M9 operation check
- Control signal: EXCB CN3-4 to 7 (M6), CN3-8 to 11 (M7), CN3-12 to 15 (M8), CN3-16 to 19 (M9)
- Location of electrical component: 25-T (M8, M9), 26-T (M6, M7)
- If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them.
- Replace the developing unit. (C Part# A9C80KD, M Part# A9C80ED, Y Part# A9C808D , K Part# A9C803D)
- Replace FRB. (Part# A7PUH00500)
- Replace EXCB. (Part# A79JH00500)
- MFPB F6E conduction check
- Replace MFPB. (C458 Part# A79MH02102 / C558 or C658 Part # A79JH02102)
NOTICE
- Link to the wiring diagram (bizhub C658/C558/C458)
Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.
K.3.12.7 (Link to the Field Service Manual)