![background image](http://html.mh-extra.com/html/icom/ic-756proii/ic-756proii_service-manual_612296104.webp)
10-4 MAIN-A UNIT
10 - 7
VOLTAGE LINE
Explanatory notes
TX LINE
RX LINE
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
AA
AB
AC
PO
5V
FORV
POCV
ALC
T8V
AGC
T8V
M5V
8V
5V
–5V
R8V
HV
14VA
H5V
–8V
T8V
14V
2IF
ALC
AGC
3R3V
8V
–5V
–8V
8V
M5V
8V
8V
5V
–5V
R8V
HV
14VA
H5V
–8V
T8V
14V
2IF
ALC
AGC
2IF
W702
C113 470p
RV-156
R507
AMS
0.001
C266
0.1
C241
FORV
R8V
unit J7
to CTRL-A
unit J1851
from RF-B
unit J3
to PA
unit J451
to RF-B
unit J1
to PLL
3R3V
3R3V_d
UNSB
HF50ACC322513-B
L205
C209 470
CP240
ALC
AGC
0.0047
C837
0.1
C831
0.1
C827
0.1
C828
W854
W3565
W3564
W151
W3563
W3562
CP820
2IF
CMCK
CMDT
GND
MAIN-A UNIT (1)
NJM2058M
IC551b
P50S
PHFS
AMS
1
C510
W503
1
C504
100k
R518
UNSB
POCV
33k
R504
CP501
CP502
R515 470k
R503 22k
MA2S111
D502
330
R501
MA8033
D501
MA8033
D505
AMS
MODS
10
C508
NJM4558M
IC101b
100k
R106
100k
R107
BANS
BANV
TRVI
TRV
UNLC
NBLV
8V
MICI
J841
J811
GND
GND
GND
J771
J101
GND
J741
14V
14V
14V
–8V
–8V
GND
GND
GND
GND
VSYNC
HSYNC
B
G
R
DRES
LMFD
LFMD
SQSS
MICE
MSND
8V
MICI
GND
GND
GND
GND
PWRK
TMD
SPE
AFO
SPE
14V
14V
14V
8V
5V
PSTB
DRES
CON0
CON1
CON2
PSEL
UNLC
14V
BSTB
MCK
MDAT
SCPL
BLAV
BLBV
SATV
TRVI
5V
–5V
R8V
T8V
ALC
8V
AGC
14V
HV
5V
14V
14VA
8V
H5V
ICH
ICL
PWRS
PAT8
MCK
MDAT
FSTB
IKEY
ISTA
DRES
ANTS
REFV
FORV
–8V
5V
T8V
14V
CP855
47
C836
C835 100
C834 0.1
C838 0.0047
0.1
C853
C856 0.1
CP856
CP853
CP852
CP851
CP850
CP849
CP854
CP841
CP844
CP845
CP848
C869 4.7
R807 220
C867 100
C868 0.1
R806 1k
10
µ
H
L451
330
µ
H
L114
D504 MA2S728
-5V
0.47
C506
2SA1576
Q521
100k
R522
10k
R521
470
R108
+
–
7
5
6
DTA144EE
Q803
2SC4081
Q801
10k
R801
O
G
AN79L05M
IC805
I
C815 10
C814 0.1
C817 100
C816 0.1
2SD1801
Q804
100
C813
47
R802
2.2k
R803
MA8051
D801
470
R804
O
G
TA7805F
IC803
I
C806 10
C805 0.1
C808 100
C807 0.1
TA7805F
IC802
O
G
I
C802 10
C801 0.1
C804 100
C803 0.1
BA033T
IC801
I
G
O
C818 10
C819 10
HF50ACC322513-B
L206
5V
1
C502
330
R502
DTA114EE
Q507
6
5
UMH4N
Q502
4
1
2
3
R510 RV-108
R509 RV-156
6
5
UMH11N
Q501
4
1
2
3
330
R513
220k
R505
7
5
6
R512 3.3M
220k
R511
+
–
470k
R517
2SA1576
Q505
DTC144TE
Q506
22k
R516
R115 270
W291
2SC4081
Q503
2SC4081
Q504
UNR9211J
Q3773
10k
R3787
47k
R514
C507 0.1
R248 100
C246 0.1
L241 1000
µ
H
R251 1.5k
0.0047
C242
2.7k
R261
R262 1k
C262 0.047
2SK882
Q261
R265 470
C268 0.1
R264 100
C267 10
C264 0.1
RV-152
R263
1k
R116
C123 0.1
LS-469
L261
D114 1SV308
D113 1SV308
C116 0.1
100k
R111
0.1
C121
LS-468
L111
LS-468
L112
1SV308
D112
1SV308
D111
330
µ
H
L115
470
R118
0.1
C122
–5V
R8V
HV
14VA
H5V
–8V
T8V
14V
CP801
W703
L721 150
µ
H
L719 EXC-ELDR25C
L720 100
µ
H
CP815
CP814
CP813
CP811
C3803 47p
C3802 47p
C3801 47p
C833 0.0047
C826 0.1
C829 0.1
C832 0.1
CP832
CP831
CP830
CP828
CP827
CP826
CP825
CP823
CP833
CP816
CP822
CP824
R3801 220
R3802 220
R3803 220
C857 0.1
C859 0.1
C863 0.1
C861 0.1
C864 0.1
C865 0.0047
C866 0.0047
0.0047
C280
R293 22k
22k
R292
2SC4081
Q279
R294 1k
C288 0.1
R279 4.7k
C279 0.1
LS-450
L273
R280 100
board J2001
to DSP-A
board J2002
to DSP-A
CP206
CP205
CP204
CP203
CP202
CP201
CP212
CP211
CP210
CP208
CP209
CP207
CP242
CP241
CP239
CP238
CP237
CP236
CP235
CP234
CP233
CP232
CP231
CP228
CP222
0.0047
C211
GND
GND
DSKY
GND
MSL1
RTDT
TXS
CTFL
AMS
DSFR
DSRS
MDAT
ACKS
DSFW
CALS
MCK
FMNS
MODS
DPGI
DSDR
NSQO
GND
GND
M5V_d
3R3V_d
GND
3R3V_d
AGRS
GND
GND
DTIF
DRIF
GND
D5VA
GND
D5VA
GND
D5VA
GND
DMAF
GND
GND
AGC
DTAF
GND
DRAF
–8V_
GND
–8V_
GND
–5V_
GND
–5V_
GND
8V_
FMTL
8V_
GND
board J301
to DISPLAY
8V
–5V
–8V
D5VA
J861
J891
HF50ACC322513-B
L204
HF50ACC322513-B
L203
HF50ACC322513-B
L202
HF50ACC322513-B
L201
CP223
CP224
CP225
CP226
CP227
CP229
CP230
CP221
J202
J201
board J321
to DISPLAY
CP272
CP271
330
R286
100mH
8V
L274
UNR911HJ
Q278
C286 220
MA2S111
D273
0.22
C285
6.8k
R290
R287 6.8k
2SC4081
Q276
C283 0.1
C284 47
2SC4081
Q274
2SA1576
Q275
2.2M
R285
47k
R284
47
C287
R283 47k
R281 100k
C281 470p
1SS375
D271
0.0022
C289
C275 0.1
2SK882
Q273
R277 22k
W278
LS-450
L272
R276 100
2SK882
Q272
R274 22k
R275 470
C274 0.1
2SK882
Q271
R271 RV-152
LS-450
L271
R272 470
C271 0.1
C272 0.1
R273 100
CP800
CP799
CP798
CP797
CP796
CP795
CP794
CP793
CP792
CP791
CP790
C716 0.1
C715 0.1
C714 0.1
CP789
CP788
CP786
L711 HF50ACC322513-B
L710 EXC-ELDR25C
L708 100
µ
H
L709 HF50ACC322513-B
CP875
CP874
CP873
CP872
CP871
CP870
CP876
CP771
CP772
CP774
CP775
CP781
CP782
CP783
CP784
C706 0.1
C707 0.1
C708 0.1
C709 0.1
C710 0.1
C711 0.1
C712 0.1
C713 0.1
L712 HF50ACC322513-B
L717 HF50ACC322513-B
L713 100
µ
H
L714 100
µ
H
L715 100
µ
H
L716 HF50ACC322513-B
R761 220
R762 220
CP704
CP703
R763 220
CP762
CP761
CP760
CP758
CP757
CP755
CP753
CP752
L707 100
µ
H
L706 100
µ
H
L705 100
µ
H
L704 100
µ
H
L703 HF50ACC322513-B
L701 EXC-ELDR25C
L702 HF50ACC322513-B
C705 0.1
C704 0.1
C703 0.1
C702 0.1
CP741
CP745
CP747
750
C854 0.0047
C855 0.0047
14V
T8V
8V
HV
R8V
-5V
-8V
4V
2V
MEASUREMENT CONDITIONS
DISPLAY FREQ. :14.10000MHZ
MODE
MEASURE
:VOLTMETER, OSCILLOSCOPE
:USB