Icom IC-756PRO III Service Manual page 93

A
MAIN-A UNIT (1)
R202
2.2k
IC201a
BA15532F
6
R209
R207 2 8 – 7
1.5k 1.5k – 1 5
3 +
+
4
R208 IC201b
BA15532F
1.5k
CP213
B
14V
C
T8V
D
–8V
E
H5V
F
8V
G
14VA
H
HV
I
AGC
J
R8V
K
–5V
L
M
M5V
N
L141
Q131
LS-468
UMH11N
4
L113
5
LS-468
O 6
Q141
3SK131
P
C119
0.0047
R135
1k
R148
10k
Q
AGC
R
S
T
R243
Q241 NTCG16
2SK882
CP243
R242
8.2k
C102 R244
D252
0.0047
47k
DAN222
R102
270k
ALC
U
IC101a 2 4
D251 1
NJM4558M –
3
DAN222 +
V 8
C104
0.1
W
–5V
X
8V
EALC ALC
Y
R533 220k
R552 8.2M
R546
R532
1M
10k
9
– 8
10 13 2
+ – 14 –
12 3
R534
+ +
IC551c
68k
NJM2058M
IC551d
IC551a
NJM2058M
NJM2058M
Z R545
RV-150
AA
AB
AC
C158
0.1
IC151
FI111
TC4W53FU
L151
CFK455E10
W122 100µH
1 8
I O
2 7
L152
100µH
3 6
4 5
R153 1M
5 5
2 4 2 4
3 3
IC152 IC153
TC4SU69F TC4SU69F
14V
T8V
–8V
H5V
8V
14VA
HV
R8V
–5V
M5V
C130
0.1
3
FI131
2 CFWM455D
1 I O
C129 D115 R126
D116 C127
MA77 0.0047 0.0047 MA77 10k
FI133
D118 C133 D117
CFWS455IT
MA77
MA77 0.0047
I O
Q132 C132
0.0047
UNR9211J C135
0.1
SSB 0V
FM 3.4V
R8V
8V
R229
C261 R253
1.8k 5.6k
0.0047
DTIF
W252
C229
IC221
470p
NJM1496V
L221 100µH
1 14
VS+ V–
R224 220 2 13
VCS NC
3 12
VCS VO– C221 R213
4 11
VS– NC 0.001 100
5 10
BIAS VC–
6 9
VO+ NC
7 8
NC VC+
R223
3.9k
8V
–5V
IC571a
W572
R561 NJM4558M
R562
470k 220
R571
D561
4 6 2 8
220
1 – 7 – 1
MA2S111
5 3
+ +
D571
11 4
IC571b MA2S111
NJM4558M
3R3V_d
3R3V
3LO
14V
8V
M5V
H5V
3R3V_d
HV
–5V
R8V
T8V
14VA
IC331
TC4W53FU
1 8
R333 4.7k
2 7
R337 10k
3 6
R340 1k
4 5
–5V
W308
DRAF
C308
IC301
10
TC4W53FU
1 8
2 7
3 6
4 5
C301 10
R301 1k
REAF
SQLS R325
1k
STON
C320 R321
4.7k
1
C303 R303
10
1k
RECO
C304 R304
0.1 10k
BEEP
DMAF W355
IC372
R365
47k BA3308F
1 14
OUT1 NC
2 13
GND IN1
3 12
NC NC
4 11
ALC NF1
5 10
R369
VCC NF2
6 9 1k
NC IN2
7 8
OUT2 NC
R377
4.7k
IC362
TC4W53FU
VOXL 1 8
2 7
3 6
4 5
MOSL
VX2
AMPO
C471 1 R471 1k
RECI
C473
10
C476 0.1
VX1
Q471
2SC4081
R473
15k
AMOD
14V
8V
M5V
H5V
3R3V_d
HV
–5V
R8V
T8V
14VA
Q331
2SD1801
C333
R336
0.082
47
Q334 C351
R343 UNR9211J
0.0047
10k
Q333
CPH3404
RL351
AHY103
C334
C338
10
470
1 5
4
2
3
IC332
LA4425A
IC311
C327 R311
AFE M5282FP
1 47k
1 10
VCC2 VCC
2 9
IN+ VCAOUT
3 8
IN– CTL
4 7
R313
OUT VCAIN
1k 5 6
R312 10k
GND NC
C312 0.0022
R314
W311 4.7k
R302 1k C302 10
IC371
M5282FP
C371 1 R372 47k R378 100
1 10
VCC2 VCC
2 9
IN+ VCAOUT
3 8
IN– CTL
4 7
R373
OUT VCAIN
2.2k 5 6
R374 100k
GND NC
C363
10
C392 0.1
C376 0.01
IC361
TC4W53FU
1 8
2 7
Explanatory notes
3 6
VOLTAGE LINE
TX LINE 4 5
RX LINE
IC451
µPC5023-077
1 24
NC GND
2 23 C457 2.2
CMPI AMP+
3 22
CMPO AMP–
C465 R464
4 21
SWI AMPO
0.1 47k
5 20
BU1I BU2I
6 19
BU1O BU2O
7 18
R463
R455 270k
SWO VOXI
10k 8 17
VCAI VOXO
9 16
C459 560p
VCAO MUTE
10 15
VCAC AVO
11 14
SWC AVI
12 13
R459
VCC NC
220k
R460 100k C463 0.1
C462 C461
R462
R461
100p 1
10k
22k
L452
RCR-875D-472K
10 - 10
BUS LINE1
14V
8V
M5V
H5V
3R3V_d
HV
–5V
R8V
T8V
3R3V
D351
DAN222
Q351
UNR9211J
SPS
MAIN-A (2)
AFO
SP
AFMS
–5V
M5V
R316 10
8V
C319 1
W319
AFGV
M5V
AAFO
C315
AFE
10
R381 10k
MONV
R380 270k
8V
R394 100k
SPCH
R364 39k
R363 10k
MSL1
MSL2
–5V
M5V
R453 C453
4.7k 1
MICO
C458
0.022
MICE
R457
C460
0.022 3.9k W452
AVXL
R458
6.8k
AFO
8V
MIGV
3R3V