Canon LBP1760P, Service Manual

Page: 202 / 394

C. Variable Resistors, LEDs, Test Pins, Jumpers and Switches on PCBs
Only the variable resistors, LEDs, test pins, jumpers, and switches which may require after-
sales service are listed below.
All other variable resistors, LEDs, test pins, etc. are adjusted only at the factory. These
require special tools and measuring instruments and must be set with high precision. Do not
touch them during after-sales service.
Notes: 1. Some LEDs receive leakage current during normal operation, thus glow dimly even
when they should be OFF.
2. Variable resistors which may be adjusted in after-sales service are marked .........
Variable resistors which may not be adjusted in after-sales service are marked ...
1. Engine Controller PCB
Figure 4-7-6
4 - 40
CHAPTER 4
1 14
J72
J53
1 13
1 3
1 2
SW1
OFF ON
1
2
J51
26
25
J60
J52
1
7
J56
5
1
6
1
6
J75 J73
1
6
1
J57 J59
1
3
2
J42
1
3
J58
1
J61
1 2
VR601
TB63
TB61
TB62
TB64
SW501
1 2
VR501 J54
1 3
J55
1 4
1
6 6
1
TB10
TB11
J1
1
2
J71 J31
VR201