Troubleshooting Malfunctions - Canon DADF-B1 Service Manual

CHAPTER 5 TOROUBLESHOOTING
A. Troubleshooting Malfunctions
Caution:
If no operation occurs in response to the push switch, be sure to turn off the main power as soon
as possible when using the DIP switch on the ADF controller PCB to make a check.
1. E400/E712
Cause Step
1 Turn off and then on the power
switch. Is the problem corrected?
Wiring 2 Set the meter to the DC (V)
range, and connect its probes to
the following terminals. Is the
voltage about 24 V for each?
ADF 3 Replace the ADF controller PCB.
controller Is the problem corrected?
PCB
2. E402
Cause Step
Feed motor 1 Set the meter to the DC (V) range,
clock sensor and connect its + probe to the
(SR1) connector J6A0-2 and its - robe to
the connector J6A-1. Does the
voltage alternate between 5 and 0
V when the feed belt is moved
slightly by hand?
Drive 2 Does the gear, motor, and belt
mechanism operate smoothly when the feed
(gear, belt; belt is moved clockwise/
damage) counterclockwise?
Feed motor 3 Set the meter to the DC (V) range,
(M2) and connect its + probe to J5-4
and its - probe to J5-3 on the ADF
controller PCB. Shift bits 2, 5, 6,
and 7 of the DIP switch, and press
the push switch. Is the reading of
the meter about 24 V when the
ADF open/closed detecting lever
is pushed?
· To stop the ongoing operation,
5-10
COPYRIGHT © 1999 CANON INC.
Checks
+ probe - probe
1 J2-1 J2-2
2 J1-6 J1-7
Table 5-201
Checks
Press the push switch.
At the end of the operation, be
sure to shift all bits of the DIP
switch to OFF.
Table 5-202
CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
YES End. (Check the wiring
between the copier's image
processor PCB and the ADF
controller PCB.)
NO Check the wiring for the
power supplied by the copier.
YES End.
NO Replace the copier's image
processor PCB.
Yes/No Action
NO Check the wiring from the
feed motor clock sensor to the
AD controller PCB; if normal,
replace the feed motor clock
sensor.
NO Check the gear and the belt.
YES Check the wiring from the
feed motor to the ADF
controller PCB; if normal,
replace the feed motor.
NO Replace the ADF controller
PCB.