Troubleshooting - Canon CLBR 460ps Service Manual

VI.MALFUNCTION STATUS TROUBLESHOOTING
If the factor of the malfunction is identified as "malfunction troubleshooting" by the malfunction
diagnosis flowchart (Figure 4-1-1), execute the followings and mend the defect.
[ 6-1 ] "SERVICE CALL NOTE # A1" Fixing motor malfunction (start-up and rotation
failure)
<Possible causes>
1) Damaged fixing unit drive gears
Action: Replace the drive gears if damaged or worn.
2) Defective fixing unit pressure release sensor lever
Action: If the fixing unit pressure release sensor lever does not move smoothly, or it is dam-
aged/deformed, replace it. If the spring is out of position, re-set to correct position.
3) Poor contact in the fixing motor drive connector and the fixing roller pressure release sensor
connector
Action: Reconnect the connectors between the fixing motor, fixing roller pressure release
sensor, feed PCB, and DC controller PCB correctly.
4) Defective fixing roller pressure release sensor
Action: Replace the fixing roller pressure release sensor.
5) Defective fixing motor
Action: Replace the fixing motor.
6) Defective feed PCB
Action: Replace the feed PCB.
7) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-2 ] "SERVICE CALL NOTE # A2" OHT detection sensor malfunction
<Possible causes>
1) Reflecting mirror is dirty or damaged
Action: Clean the reflecting mirror with dry-cloth. Replace the reflecting mirror if damaged
or worn.
2) Poor contact in the multi-purpose tray PCB connector
Action: Reconnect the connectors between the multi-purpose tray PCB, relay connector,
and DC controller PCB correctly.
3) Defective OHT detection sensor
Action: Replace the malti-purpose tray PCB.
4) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-3 ] "SERVICE CALL NOTE # A3" Duplexing unit malfunction
<Possible causes>
1) Poor contact in the SIDE REGISTRATION GUIDE HOME-POSITIONING SENSOR signal line
CHAPTER 4
4 - 37