C255A (bizhub C658/C558/C458)

Contents

Trouble type	C255A: Magenta 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/C,M,Y,K  • 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

1. Reinstall the developing unit.
2. Check the connector between the developing unit-FRB CN13 (C255C), CN14 (C2559), CN15 (C255A), CN16 (C255B) 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. 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)
5. 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: 15-C (M7, M8), 16-C (M9)
6. Replace the developing unit. (C Part# A9C80KD, M Part# A9C80ED, Y Part# A9C808D , K Part# A9C803D)
7. Replace FRB. (Part# A7PUH00500)
8. Replace EXCB. (Part# A79JH00500)
9. 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.3.12.9 (Link to the Field Service Manual)