Canon DADF-J1 Service Manual page 215

CHAPTER 5 TROUBLESHOOTING
Pickup roller height sensor 1 (PI8)
3) Se the meter range to 10 VDC. Does the voltage between J14-A8 (+)
NO:
Pickup roller height sensor 2 (PI9)
4) Set the meter range to 10 VDC. Does the voltage between connec-
NO:
Pickup roller home position sensor (PI7)
5) Set the meter range to 10 VDC. Is the voltage between connectors
NO:
ADF controller PCB
6) Try replacing the ADF controller PCB. Is the problem corrected?
YES: Replace the ADF controller PCB.
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and J14-A7 (-) on the ADF controller PCB alternate between 0 and
5 V when the pickup roller unit (rear) is moved up/down by hand?
Replace the pickup roller height sensor 1 (PI8).
tors J14-A1 (+) and J14-A10 (-) on the ADF controller PCB alter-
nate between 0 and 5 V when the pickup roller unit (front) is moved
up/down by hand?
Replace the pickup roller height sensor 2 (PI9).
J14-A5 (+) and J14-A4 (-) on the ADF controller PCB about 5 V
when the pickup roller unit is returned to home position by hand?
Replace the pickup roller home position sensor (PI7).
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON DADF-J1 REV.0 MAR.2001