Canon PC921 Service Manual - Page 363
DC Controller Circuit DIagram 2/8, SC_I_SEL3, SC_INB, SC_COM
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DC Controller Circuit DIagram (2/8) SC_I_SEL3 SC_I_SEL1 SC_I_SEL2 +5V Q165 Q112 2 3 Q155 1 R277 R117 R267 +5V R115 R114 R113 +24VU R399 Q109 SC_INB* SC_INB SC_INA* SC_INA +5V R227 R226 R225 R224 C263 C264 C265 C266 C107 +5V R111 C109 1 OUTA* 2 TdA 3 REFA 4 GA 5 INA* 6 INA 7 VSA 8 OUTA 9 RSA 10 RSB 11 OUTB* 12 VSB 13 TdB 14 REFB 15 GB 16 INB* 17 INB 18 OUTB R112 C106 R107 R108 +5V R109 C108 SC_COM SC_B SC_B* SC_A SC_A* C166 C165 C164 C163 A-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
A-8
COPYRIGHT
©
1999
CANON INC.
CANON
PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
DC Controller Circuit DIagram (2/8)
Q165
SC_I_SEL3
+5V
R277
SC_I_SEL1
R117
Q112
SC_I_SEL2
SC_INB*
SC_INB
SC_INA*
SC_INA
R267
Q155
R115
OUTA*
1
TdA
2
REFA
3
GA
4
INA*
5
INA
6
VSA
7
OUTA
8
RSA
9
RSB
10
OUTB*
11
VSB
12
TdB
13
REFB
14
GB
15
INB*
16
INB
17
OUTB
18
R114
R111
R107
R108
C109
C263
C264
C265
C266
R113
Q109
R112
SC_COM
SC_B
SC_B*
SC_A
SC_A*
+5V
R224
R225
R226
R227
+5V
+5V
R109
C108
+5V
R399
+24VU
C166
C106
C107
C165
C164
C163
3
2
1