Canon imageRUNNER ADVANCE 4551i Service Manual page 398

003-0000-05
Detection Description
Remedy
004-0000-05
Detection Description
Remedy
004-0001-05
Detection Description
Remedy
Low fixing temperature detection after standby
The reading of the main thermistor is less than 100 deg C continuously for 200 msec or more.
[Related parts]
- Harness connecting from the DC Controller PCB (UN2/J307) to the Fixing Main Thermistor (TH1/
J707)
- Fixing Main Thermistor (TH1)
- Fixing Unit
- DC Controller PCB (UN2)
[Remedy]
1.Go through the following to clear the error: COPIER> FUNCTION> CLEAR> ERR; and then turn
OFF and then ON the power.
2.Check/replace the harness and connector between the DC Controller PCB and the Fixing Main
Thermistor.
3.Replace the Fixing Main Thermistor (Film Unit).
4.Replace the Fixing Unit.
5.Replace the DC Controller PCB.
[Reference]
Before replacing the DC Controller PCB, back up the service mode data and restore the backup
data after the replacement so the data may be able to be protected.
- Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP
- Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES
Thermistor disconnection detection error
When disconnection is detected with connector (J307) for 30 sec continuously.
[Related parts]
- Harness connecting from the DC Controller PCB (UN2/J307) to the Fixing Main Thermistor (TH1/
J707)
- Fixing Main Thermistor (TH1)
- Fixing Unit
- DC Controller PCB (UN2)
[Remedy]
1.Go through the following to clear the error: COPIER> FUNCTION> CLEAR> ERR; and then turn
OFF and then ON the power.
2.Check/replace the harness and connector between the DC Controller PCB and the Fixing Main
Thermistor.
3.Replace the Fixing Main Thermistor (Film Unit).
4.Replace the Fixing Unit.
5.Replace the DC Controller PCB.
[Reference]
Before replacing the DC Controller PCB, back up the service mode data and restore the backup
data after the replacement so the data may be able to be protected.
- Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP
- Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES
Fixing relay welding detection error
Welding of the fixing relay on the AC Driver PCB was detected.
[Related parts]
- AC Driver PCB (UN30)
- DC Controller PCB (UN2)
[Remedy]
1.Replace the AC Driver PCB.
2.Replace the DC Controller PCB.
[Reference]
Before replacing the DC Controller PCB, back up the service mode data and restore the backup
data after the replacement so the data may be able to be protected.
- Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP
- Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES
385
7. Error/Jam/Alarm