C3B09 (bizhub C759/C659)

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

Contents

Trouble type	C3B09: IH communication error
Rank	C
Trouble detection condition	No signal has been received from the IH power supply unit a predetermined number of consecutive times.
Trouble isolation	–
Relevant electrical parts	-IH power supply unit (IHPU) -Noise filter (NF1) -MFP board (MFPB)

 Procedure

1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between MFPB CN26E-IHPU CN6 for proper connection and correct as necessary.
4. Check the connector between NF1 CN3-MFPB CN29E for proper connection and correct as necessary.
5. Check the connector between CN1AC-NF1 CN1 for proper connection and correct as necessary.
6. Check the connector between NF1 CN2-IHPU CN1 for proper connection and correct as necessary.
7. Replace IHPU. (Part# A8KNM40A02)
8. Replace NF1. (Part# A795M40J00)
9. MFPB F21E conduction check
10. Replace MFPB. (Part# A8JEH02002)

L.3.10.17 (Link to the Field Service Manual)