C2557 (bizhub 368/308)
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 • Toner cartridge • Toner empty sensor/K (PS31) • Toner cartridge motor/K (M25) • Toner supply motor/K (M6) • Front side board (FRB) • MFP board (MFPB) |
Procedure
- Perform image troubleshooting procedure if image density is low.
- Reinstall developing unit.
- Reinstall toner cartridge.
- Check the connector between the developing unit -FRB CN13 for proper connection and correct as necessary.
- Check the connector between FRB CN1, CN3-MFPB CN4E, CN11E for proper connection and correct as necessary.
- M25 operation check
- Control signal: MFPB CN30E-1 to 4
- Location of electrical component: 16-C
- M6 operation check
- Control signal: MFPB CN30E-5 to 8
- Location of electrical component: 17-C
- If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them.
- Replace the developing unit. (Part# A7U403D)
- Replace FRB. (Part# A9HJH00501)
- Replace MFPB. (Part# A9HJH02102)
NOTICE
- Link to the wiring diagram (bizhub 368/308)
- Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.
K.3.10.3 (Link to the Field Service Manual)