C255C (bizhub C368/C308/C258)

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 unit/K • Toner cartridge motor/K (M25) • Toner supply motor/K (M6) • Front side board (FRB) • MFP board (MFPB)

 Procedure

1. Reinstall developing unit/K.
2. Check the connector between the developing unit/K-FRB CN13 for proper connection and correct as necessary.
3. Check the connector between FRB CN1, CN3-MFPB CN4E, CN11E for proper connection and correct as necessary.
4. M25 operation check
   • Control signal: MFPB CN30E-1 to 4
   • Location of electrical component: 16-C
5. M6 operation check
   • Control signal: MFPB CN30E-5 to 8
   • Location of electrical component: 17-C
6. Replace the developing unit/K. (Part# A7U403D)
7. Replace FRB. (Part# A7PUH00500)
8. 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.3.11.10 (Link to the Field Service Manual)