C3722, C3725, C3726 (bizhub C750i)
Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.
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. -At the first time the high temperature abnormally is detected after the main power switch is turned on, Controller JAM 99-15 (heating roller temperature sensor abnormally high temperature detection) will be displayed. From the 2nd time that the high temperature abnormally is detected, the trouble code C3725 will be displayed. 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), or C3725: Heating roller temperature sensor (TEMS), or C3726: Heating roller thermistor/Ctr (TH2) -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 CN95-BASEB CN4E for proper connection and correct as necessary.
- Check CPUB for proper installation and correct as necessary.
- Replace the fusing unit. (Part# AA7NR70200)
- Replace CPUB. (Part# ACKNH02P03)
- Replace BASEB. (Part# ACKNH02101)