E412; E420 - Canon iR8500 Service Manual

CHAPTER 6 TROUBLESHOOTING
Pickup roller height sensor 1 (PI8)
3) Set the meter range to 10 VDC. Move the pickup roller unit (rear)
NO:
Pickup roller height sensor 2 (PI9)
4) Set the meter range to 10 VDC. Move the pickup roller unit (font)
NO:
Pickup roller home position sensor (PI7)
5) Set the meter range to 10 VDC.
NO:
ADF controller PCB
6) Replace the ADF controller PCB. Is the problem corrected?
YES: Replace the ADF controller PCB.
4.1.51 E412 (Indicated if iR7200)
Foreign object
1) Is there a foreign object that prevents the rotation of the coolong
YES: Remove the foreign object.
Connector
2) Is the connector (J11) on the ADF controller PCB connected
NO:
Cooling fan (FM1), ADF controller PCB
3) Try replacing the cooling fan (FM1). Is the problem corrected?
YES: End.
NO:
4.1.52 E420 (Indicated if iR7200)
ADF controller PCB
1) Replace the ADF controller PCB.
6-120
up and down by hand. Does the voltage between connectors J14-A8
(+) and J14-A7 (–) on the ADF controller PCB change between 0 V
and 5 V?
Replace the pickup roller height sensor 1 (PI8).
up and down by hand. Does the voltage between J14-A11 (+) and
J14-A10 on the ADF controller PCB alternate between 0 and 5 V?
Replace the pickup roller height sensor 2 (PI9).
Move the pickup roller unit (front) up and down by hand. Is the
voltage between J14-A5 (+) and J14-A4 (–) on the ADF controller
PCB about 5 V?
Replace the pickup roller home position sensor (PI7).
fan?
firmly?
Connect it securely.
Replace the ADF controller PCB.
COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001