Icom IC-756PRO III Service Manual page 90

MAIN-A UNIT (1)
W702
J741 C702 0.1
L701 EXC-ELDR25C 14V
C703 0.1
C704 0.1
C705 0.1
L702 HF50ACC322513-B T8V
L703 HF50ACC322513-B 5V
GND
L704 100µH –8V
to CTRL-A
unit J7
L705 100µH FORV
L706 100µH REFV
L707 100µH ANTS
DRES
GND W703
ISTA
IKEY
R763 220 FSTB
CMDT R761 220 MDAT
CMCK R762 220 MCK
J101
from RF-B 2IF
unit J1851
C122
R118 L115
0.1
330µH
470
J771
L716 HF50ACC322513-B PAT8
L715 100µH PWRS
L714 100µH
ICL
L713 100µH ICH
L717 HF50ACC322513-B H5V
L712 HF50ACC322513-B 8V
L711 HF50ACC322513-B 14VA
L710 EXC-ELDR25C 14V
to PA
unit J3
L709 HF50ACC322513-B 5V
L708 100µH HV
GND
J811
L720 100µH 14V
AGC
L719 EXC-ELDR25C 8V
ALC
T8V
L721 150µH R8V
–5V
to RF-B
unit J451
5V
TRVI
SATV
BLBV
BLAV
SCPL
GND
R3801 220 MDAT
R3802 220 MCK
R3803 220 BSTB
J841
GND
14V
UNLC
PSEL
to PLL CON2
unit J1
CON1
CON0
DRES
PSTB
5V
8V
L271 L272
LS-450 Q272 LS-450
Q271
2SK882 2SK882
R8V
14V
T8V
–8V
H5V
2IF
8V
14VA
HV
AGC
ALC
R8V
–5V
5V
MEASUREMENT CONDITIONS
DISPLAY FREQ. :14.10000MHZ
MODE :USB
MEASURE :VOLTMETER, OSCILLOSCOPE
J861
14V
14V
14V
SPE
AFO
SPE
TMD
PWRK to DISPLAY
board J321
GND
GND
GND
GND
MICI
8V
MSND
MICE
SQSS
J891
W151 LFMD
LMFD
W3563
DRES
R
W3565
G
B
HSYNC
W3564
VSYNC
GND
W3562
GND
GND to DISPLAY
board J301
GND
W854
–8V
–8V
14V
14V
14V
10 - 7
CP271
L273
Q273 LS-450
Q279 C289
2SK882 2SC4081 0.0022
R292
22k
14V
T8V
–8V
H5V
2IF
8V
14VA
HV
AGC
ALC
R8V
–5V
5V
IC802
TA7805F
8V
J201
L201
GND
HF50ACC322513-B
8V_ 8V
FMTL
8V_
GND
–5V_ –5V
GND
L202
–5V_
HF50ACC322513-B IC803
TA7805F
GND
–8V_ 8V
–8V
GND
L203
–8V_
HF50ACC322513-B
CP202
DRAF
GND
to DSP-A CP203
CP211
DTAF
board J2001
AGC
GND
GND
CP204
DMAF
Q804
GND
2SD1801
CP205
D5VA D5VA
GND
L204
D5VA
HF50ACC322513-B
GND
D5VA
CP212
GND IC805
CP206
DRIF AN79L05M
DTIF –8V
GND
GND
C209 470
J202
IC801
AGRS BA033T
3R3V_d 3R3V
GND
L206
3R3V_d
HF50ACC322513-B
M5V_d
GND
CP228 L205
GND
HF50ACC322513-B
NSQO
DSDR
DPGI
UNSB
MODS
FMNS
MCK
to DSP-A
CALS
board J2002
DSFW
ACKS
MDAT
DSRS
DSFR
AMS
CTFL
TXS R107
100k
RTDT
MSL1
6
GND –
5
DSKY +
GND
IC101b
GND
NJM4558M
CP242 3R3V_d
3R3V
L274
CP272
100mH
Q276
2SC4081
Q278
R285 UNR911HJ
2.2M
R284 Q275
47k
2SA1576
Q274
2SC4081
14V
T8V
–8V
H5V
2IF
8V
14VA
HV
AGC
ALC
R8V
–5V
5V
M5V
L111
D111 C121 LS-468
1SV308 0.1
M5V
I O
G
Q503
2SC4081
T8V
R514
47k
I O
G
Q504
R804 2SC4081
470
AGC
L261
LS-469
R802
47
–5V
I O
G
ALC
T8V
POCV
8V
O I FORV FORV
G
5V
CP502
R511
TRV
CP501 R512 3.3M
220k
Q803
DTA144EE
TRVI
D502 R504 R505
6
MA2S111 –
33k 220k
5
+
IC551b
Q801
NJM2058M
2SC4081
Q501
UMH11N
4
BANV
5 3
6 2
2V PO
1
Q507
7 BANS
DTA114EE
R108
470
4V
A
8V
Explanatory notes
VOLTAGE LINE
TX LINE
RX LINE
B
14V
C
T8V
D
-8V
E
F
8V
G
H
HV
I
J
R8V
K
-5V
L
M
N
L112
LS-468
C113 470p
D113 1SV308
O
D114 1SV308
P
R3787
10k
MODS
Q3773
UNR9211J
AMS
Q
R
Q261 S
2SK882
T
U
V
Q506
Q505
2SA1576 DTC144TE
W
R517
Q521
R516 470k
22k 2SA1576
-5V
X
Y
D504 MA2S728
7
R513
330
Q502
UMH4N
4
5 3
6 2
1
Z
AA
AB
AC