COPYRIGHT
©
1999 CANON INC. CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
5-11
CHAPTER 5 TROUBLESHOOTING
3. E404
Table 5-203
Cause
Reversal
delivery motor
clock sensor
(SR7)
Drive
mechanism
(gear, belt;
damage)
Reversal
delivery motor
(M3)
Step
1
2
3
Checks
Set the meter to the DC (V)
range, and connect its +
probe to the connector J7B-5
and its - probe to the
connector J7B-4. Does the
voltage alternate between 5
and 0 V when the clock disk
or the reversing roller (after
opening the reversal delivery
cover) is turned slowly?
Open the reversal delivery
cover, and turn the reversing
roller clockwise/
counterclockwise. Do the
gear, motor, and belt move
smoothly?
Set the meter to the DC (V)
range, and connect its +
probe to the connector J9-1
and its - probe to the
connector J9-2 of the ADF
controller PCB. Shift bits 2,
5, 6, and 7 of the DIP switch
to ON, and press the push
switch. Does the reading of
the meter change to about 24
V when the ADF open/closed
detecting lever is pushed?
· To stop the ongoing
operation,
Press the push switch.
At the end of the operation,
be sure to shift all bits of
the DIP switch to OFF.
Yes/No
NO
NO
YES
NO
Action
Check the wiring from the
reversal delivery motor clock
sensor to the ADF controller
PCB; if normal, replace the
reversal delivery motor clock
sensor.
Check the gear and belt.
Check the wiring from the
reversal delivery motor to the
ADF controller PCB; if
normal, replace the reversal
delivery motor.
Replace the ADF controller
PCB.
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