How Can We Help?
C3722, C3725, C3726 (bizhub 750i)
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# ACV7H02P02)
- Replace BASEB. (Part# ACV7H02101)