C2555 (bizhub C368/C308/C258)

Contents

Trouble type	C2555: Abnormally low toner density detected yellow 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  • 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# A7U408D)
10. Replace FRB. (Part# A7PUH00500)
11. Replace MFPB. (Part# A7PUH02123)

NOTICE

• Link to the wiring diagram (bizhub C368/C308/C258)

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)