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IC-756PROIII
Service manual
Icom IC-756PROIII Service Manual page 105
Hf/50mhz all band transceiver
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Also See for IC-756PROIII
:
Instruction manual
(124 pages)
,
Service manual
(106 pages)
,
Installation notes
(4 pages)
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Table Of Contents
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A
MAIN-A UNIT (1)
R202
2.2k
IC201a
BA15532F
6
R207
R209
2
8
–
7
–
1.5k
1.5k
1
5
3
+
+
4
IC201b
R208
1.5k
BA15532F
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
LS-468
L113
LS-468
O
Q141
3SK131
P
C119
0.0047
R135
1k
R148
10k
Q
AGC
R
S
T
Q241
2SK882
CP243
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
CFK455E10
W122
1
8
I
O
2
7
L152
100µH
3
6
CP213
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
Q131
UMH11N
4
C130
0.1
5
3
FI131
6
2
CFWM455D
1
I
O
C127
C129
D115
R126
D116
MA77
0.0047
0.0047
MA77
10k
FI133
D117
D118
C133
CFWS455IT
MA77
MA77
0.0047
I
O
C132
Q132
UNR9211J
0.0047
C135
0.1
SSB 0V
FM 3.4V
R243
R253
R229
C261
NTCG16
0.0047
1.8k
5.6k
DTIF
W252
R242
C229
IC221
8.2k
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
NJM4558M
R562
R561
470k
220
D561
4
6
2
8
–
1
–
7
–
1
MA2S111
5
3
+
+
+
11
4
D571
MA2S111
IC571b
NJM4558M
3R3V_d
3R3V
3LO
14V
8V
M5V
L151
H5V
100µH
3R3V_d
HV
–5V
R8V
T8V
14VA
IC331
TC4W53FU
1
8
2
7
3
6
4
5
–5V
W308
DRAF
C308
IC301
10
TC4W53FU
1
8
2
7
3
6
4
5
C301 10
R301 1k
REAF
SQLS
STON
C320
R321
1
4.7k
C303
10
RECO
C304
0.1
BEEP
W355
DMAF
R8V
IC372
R365
BA3308F
47k
8V
1
14
OUT1
NC
2
13
GND
IN1
3
12
NC
NC
4
11
ALC
NF1
5
10
VCC
NF2
6
9
NC
IN2
7
8
OUT2
NC
IC362
TC4W53FU
VOXL
1
8
2
7
3
6
4
5
MOSL
VX2
AMPO
C471 1
RECI
C473
10
C476 0.1
VX1
Q471
2SC4081
R473
15k
R571
220
AMOD
14V
8V
M5V
H5V
3R3V_d
HV
–5V
R8V
T8V
14VA
Q331
2SD1801
C333
R336
R333 4.7k
0.082
47
R337 10k
Q334
R340 1k
R343
UNR9211J
10k
Q333
CPH3404
C334
C338
10
1
5
470
4
2
3
IC332
LA4425A
IC311
C327
R311
AFE
M5282FP
1
47k
1
10
VCC2
VCC
R325
2
9
IN+
VCAOUT
1k
3
8
IN–
CTL
4
7
R313
OUT
VCAIN
1k
5
6
R312 10k
GND
NC
R303
1k
C312 0.0022
W311
R304
10k
R302 1k
C302 10
IC371
M5282FP
C371 1
R372 47k
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
R369
C363
1k
10
C392 0.1
R377
4.7k
IC361
TC4W53FU
1
2
Explanatory notes
3
VOLTAGE LINE
TX LINE
4
RX LINE
IC451
R471 1k
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
SWO
VOXI
10k
8
17
VCAI
VOXO
9
16
VCAO
MUTE
10
15
VCAC
AVO
11
14
SWC
AVI
12
13
R459
VCC
NC
220k
R460 100k
C463 0.1
C462
R462
R461
100p
10k
22k
L452
RCR-875D-472K
10 - 8
BUS LINE1
14V
8V
M5V
H5V
3R3V_d
HV
–5V
R8V
T8V
3R3V
D351
DAN222
Q351
C351
UNR9211J
0.0047
SPS
MAIN-A (2)
RL351
AHY103
AFO
SP
AFMS
–5V
M5V
R316 10
8V
C319
1
W319
AFGV
R314
M5V
4.7k
AAFO
C315
AFE
10
R378 100
R381
10k
MONV
R380
270k
8V
R394 100k
SPCH
C376
0.01
8
R364 39k
7
R363 10k
6
5
MSL1
MSL2
–5V
M5V
C453
R453
4.7k
1
MICO
C458
0.022
MICE
R455 270k
C459 560p
R457
C460
0.022
3.9k
W452
AVXL
C461
R458
6.8k
1
AFO
8V
MIGV
3R3V
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