C255C (bizhub 558/458)

Contents

Trouble type	C255C: Black TCR sensor adjustment failure
Rank	B
Trouble detection condition	TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
Trouble isolation	–
Relevant electrical parts	Developing unitToner cartridge motor/K (M25)Toner supply motor/K (M6)Expansion control board (EXCB)Front side board (FRB)MFP board (MFPB)

 Procedure

1. Reinstall the developing unit.
2. Check the connector between the developing unit-FRB CN13 for proper connection and correct as necessary.
3. Check the connector between FRB CN1, CN3-MFPB CN4E, CN5E for proper connection and correct as necessary.
4. M25 operation check
   • Control signal: MFPB CN28E-4 to 7
   • Location of electrical component: 15-C
5. M6 operation check
   • Control signal: EXCB CN3-4 to 7
   • Location of electrical component: 16-C
6. Replace the developing unit. (Part# A9C803D)
7. Replace FRB. (Part# A9HJH00501)
8. Replace EXCB. (Part# A9HGH00501)
9. Replace MFPB. (558 Part# A9HGH02102 / 458 Part# A9HHH02102)

NOTICE

• Link to the wiring diagram (bizhub 558/458)

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)