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C3722, C3725, C3726 (bizhub 4700i)
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Contents
| Trouble type | C3722: Fusing abnormally high temperature detection (Edge of the heating roller) C3725: Fusing abnormally high temperature detection (Main of the heating roller) C3726: Fusing abnormally high temperature detection (Center of the heating roller) |
| Rank | A |
| Trouble detection condition | C3722: Detected temperature of the heating roller thermistor/Edg (TH1) goes beyond a given temperature for a given period of time consecutively. C3725: Detected temperature of the heating roller temperature sensor (TEMS) goes beyond a given temperature for a given period of time consecutively. C3726: Detected temperature of the heating roller thermistor/Ctr (TH2) goes beyond a given temperature for a given period of time consecutively. |
| Trouble isolation | – |
| Relevant electrical parts | -Fusing unit -C3722: Heating roller thermistor/Edg (TH1) -C3725: Heating roller temperature sensor (TEMS) -C3726: Heating roller thermistor/Ctr (TH2) -DC power supply (DCPS) -CPU board (CPUB) -Base board (BASEB) |
Procedure
- Check the fusing unit for correct installation (whether it is secured in position).
- Check the open/close operation of the right door.
- Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
- Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
- Check CPUB for proper installation and correct as necessary.
- Replace the fusing unit. (Part# ACT9R70100)
- Replace CPUB. (Part# ACTAH01003)
- Replace BASEB. (Part# ACTAH02014)
- Replace DCPS. (Part# AAJRR70600)