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C4501 (bizhub C759/C659)
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Contents
| Trouble type | C4501: Laser malfunction |
| Rank | B |
| Trouble detection condition | -SOS signal is not detected even after the lapse of a given period of time after starting the laser output. -SOS signal is not detected for a given period of time during printing or IDC sensor adjustment. |
| Trouble isolation | – |
| Relevant electrical parts | -PH unit -PH relay board (PHRYB) -MFP board (MFPB) |
Procedure
- Check the connector between the PH unit-PHRYB CN10 for proper connection and correct as necessary.
- Replace the PH unit. (Part# A8JER70300)
- PHRYB ICP2 conduction check.
- Replace PHRYB. (Part# A8JEH00301)
- Replace MFPB. (Part# A8JEH02002)
L.3.11.5 (Link to the Field Service Manual)