COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001CHAPTER 6 TROUBLESHOOTING6-120Pickup roller height sensor 1 (PI8)3) Set the meter range to 10 VDC. Move the pickup roller unit (rear)up and down by hand. Does the voltage between connectors J14-A8(+) and J14-A7 (–) on the ADF controller PCB change between 0 Vand 5 V?NO: Replace the pickup roller height sensor 1 (PI8).Pickup roller height sensor 2 (PI9)4) Set the meter range to 10 VDC. Move the pickup roller unit (font)up and down by hand. Does the voltage between J14-A11 (+) andJ14-A10 on the ADF controller PCB alternate between 0 and 5 V?NO: Replace the pickup roller height sensor 2 (PI9).Pickup roller home position sensor (PI7)5) Set the meter range to 10 VDC.Move the pickup roller unit (front) up and down by hand. Is thevoltage between J14-A5 (+) and J14-A4 (–) on the ADF controllerPCB about 5 V?NO: Replace the pickup roller home position sensor (PI7).ADF controller PCB6) Replace the ADF controller PCB. Is the problem corrected?YES: Replace the ADF controller PCB.4.1.51 E412 (Indicated if iR7200)Foreign object1) Is there a foreign object that prevents the rotation of the coolongfan?YES: Remove the foreign object.Connector2) Is the connector (J11) on the ADF controller PCB connectedfirmly?NO: Connect it securely.Cooling fan (FM1), ADF controller PCB3) Try replacing the cooling fan (FM1). Is the problem corrected?YES: End.NO: Replace the ADF controller PCB.4.1.52 E420 (Indicated if iR7200)ADF controller PCB1) Replace the ADF controller PCB.
