Cpu Pcb; Ip Main Pcb - Canon CLC 1120 Service Handbook

CHAPTER 3 ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS
Caution:
If the copier is used in highlands (low atmospheric pressure), images may suffer from transfer
faults. Try changing the setting of the DIP switch (SW1) to highland 1, and see if the problem
is corrected; if the problem still occurs, switch SW1 to highland 2.
If the problem still remains thereafter, shift SW1 back to its normal setting, and try to check
other possible causes.

2. CPU PCB

LED1: turns on when +5 V is supplied.
LED2: turns on when +24 V is supplied.
3.

IP main PCB

3-18
B15 B1 B9 B1
B14 B2 B8 B2
J2002 J2003
1 4
A1 A15 A1 A9
J2001
A2 A14 A2 A8
A15 A1
J30
A1 A15
A49 A1
A50 A2
J2012
B50 B2
B49 B1
J214
B1 B39 B1
B2 B40 B2
A1 A39 A1
A2 A40 A2
52
51
100
J216 99
50
2 49
1
2 14 2 14
J217 J218
1 15 1 15
J211
32 1 32
B10 B2 B20 B2
B9 B1 B19 B1
J2005
J2004
A1 A9 A1 A19
A2 A10 A2 A20
1 5 1 4 1
J9 J6
B34
B33 J24
A34
A33
VR1
B34
B33
LED1
A34
A33
LED2
2 8
J2010
1 9
J2011
1 7
Figure 3-15
J215
B49
B50
A49
A50
J212
1 32
Figure 3-16
B17 B1
B16 B2
J2006
A1 A17
A2 A16
6
B2
J2
B1
A2
A1
B2
B1
J25
A2
A1
A30 A2
A29 A1
J2009
B30 B2
B29 B1
J213
1