COPYRIGHT © 1998 CANON INC. CANON DADF-A1 REV.0 DEC. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
5-27
CHAPTER 5 TROUBLESHOOTING
IV. VARIABLE
RESISTORS, LIGHT-
EMITTING DIODES, AND
CHECK PINS BY PCB
Of all variable resistors (VR), light-
emitting diodes, and check pins, those needed
when servicing the machine in the field are
discussed.
Caution:
Do not touch the variable resistors and
check pins not discussed herein. They are
for the factory, and require special tools
and must be adjusted to high accuracy.
A.
DADF Controller PCB
Caution:
1. Some LEDs emit dim light even when
off because of leakage current. This is a
normal condition, and must be kept in
mind:
2. VRs that may be used in the field
VRs that must not be used in the field
SW1
TP1
J10
J15
J1
CB1
J2
J14
J12
J11
J7
J6
J13
J5
J9
J8
J3
B12
B1
2
6
1
1
1
3
1
2
1
3
1
2
13
1
14
2
A1
A12
1
1
1
1
9
10
1
4
2
2
8
1
7
1
DSW1
SW2
SW3
LED1
LED2
Figure 5-401
