Variable Resistors (Vr), Light-Emitting Diodes (Led), And Check Pins By Pcb; Dc Driver Pcb - Canon CLC 1120 Service Handbook

I. Variable Resistors (VR), Light-Emitting Diodes (LED), and
Check Pins by PCB
Of the variable resistors (VR), light-emitting diodes (LED), and check pins used in the copier,
those that may be used in the field are discussed.
Caution:
1. Some LEDs emit light even when off because of leakage current. It 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 it the field:
3. The VRs and check pins that are not found in the tables are for the factory only, and require
special tools and high accuracy. Do NOT touch them in the field.

1. DC Driver PCB

A11
J1014
B1
LED: turns on when +24 V is supplied, and turns off when the front cover is opened.
OFF
ON
OFF
ON
CHAPTER 3 ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS
B15 B1 B1 J1028
B10
J1025
J1026 J1027
1 3 1 5
A1 A15 A1 A10
7
J1053
8
1 5
J1051
1 7
J1050
ON
(NEW TYPE)
1 2
SW1
A1 A17 A1 A13 A1 A12
J1013 J1012 J1011
B11 B1 B17 B1 B13 B1
Figure 3-14
SW1-1 SW1-2
OFF
OFF
ON
ON
Table 3-14
B1 B1
B10 B12
J1024 J1023
A1 A10 A1 A12
5 1
J1030
1
2 1
2 VR1 J1040
ON
(OLD TYPE)
1 2
SW1
VR2
LED1
A1
1 9
J1010
J1009
B12
1 4
OUT
Normal
Case 1
Case 2
Not used
B10 B1
2 14
J1022 J1029
1 13
A1 A10
12 1
J1052
A8 A1 A18 A1
J1008 J1007
B1 B8 B1 B18
Remarks
Normal area
Highland 1
Highland 2
3-17