Variable Resistors (Vr), Light-Emitting Diodes (Led), Check Pins, Jumpers, And Switches By Pcb - Canon LBP-2000 Service Manual

CHAPTER 4
D. Variable Resistors (VR), Light-Emitting Diodes (LED), Check Pins, Jumpers, and Switches
by PCB
Of the VRs, LEDs, check pins, jumpers, and switches used in the Printer, those needed for servic-
ing in the field are discussed.
Do not touch the VRs or check pins into indicated in the tables; they are for use at the factory
only, and require special tools and high accuracy.
Notes: 1. Some LEDs emit dim light because of leakage current even while they are OFF. 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 ------
1. DC controller PCB
4 - 34
J102
J108 J103
J109
11 1
1
3 5 1
10 2
4 2
2 1
3 1
VR101
SW101
J107
1
35
34 2
Figure 4-7-4
Table 4-7-1
Notation
VR101
For adjusting leading edge adjustment
VR401
For adjustment in factory
VR402
For adjustment in factory
VR403
For adjustment in factory
SW101
Test Print switch
PI104
J111
7 1
J110
5 1
J106
19
1
4 2
18 2
VR402
VR403
J101
11 1
Description