C4501 (bizhub C754/C654)
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Contents
| Trouble type | Laser malfunction |
| Trouble code | C4501 |
| Rank | B |
| Detection timing | -SOS signal is not detected even after the lapse of a given period of time after staring 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) -Printer control board (PRCB) |
(2)Procedure
| Step | Action | Control signal | Location of electrical components |
| 1 | Check the connector between the PH unit-PHRYB CN15, 16 for proper connection and correct as necessary. | – | – |
| 2 | Replace the PH unit (Part# A2X0R70B22) | – | – |
| 3 | PHRYB ICP2 conduction check | – | – |
| 4 | Replace PHRYB (Part# A2X0H00300) | – | – |
| 5 | Replace PRCB (Part# A2X0H00102) | – | – |
- Link to the layout drawings for related parts by each trouble code (S.80. C4501)
K.3.9.4 (Link to the Field Service Manual)