C3722 (bizhub C754e/C654e)
Contents
| Trouble type | Fusing abnormally high temperature detection (Edge of the heating roller) |
| Trouble code | C3722 |
| Rank | A |
| Detection timing | • The heating roller thermistor/3 continues to detect a temperature higher than a predetermined one for a predetermined period of time. • The hard protection signal at the edges of the heating side remains OFF for a predetermined continuous period of time. |
| Trouble isolation | – |
| Relevant electrical parts | • Fusing unit • Heating roller thermistor/3 (TH3) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB) |
(2)Procedure
| Step | Action | Control signal | Location of electrical components |
| 1 | Check the fusing unit for correct installation (whether it is secured in position). | – | – |
| 2 | Check the open/close operation of the upper right door. | – | – |
| 3 | Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. | – | – |
| 4 | Replace the fusing unit (Part# A2X0R71055) | – | – |
| 5 | Replace IHPU (Part# A61DM40A00) | – | – |
| 6 | Replace PRCB (Part# A2X0H00S06) | – | – |
| 7 | Replace NF1 (Part# A2XKM40J00) | – | – |
- Link to the layout drawings for related parts by each trouble code (S.72. C3425, C3725, C3825, C3925)
- Link to the layout drawings for related parts by each trouble code (S.73. C3722, C3726, C3822, C3903, C3922, C3926)
Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.
K.3.8.7 (Link to the Field Service Manual)