Main-A Unit - Icom IC-756PROIII Service Manual

8-10 MAIN-A UNIT

• TOP VIEW
150
145
140
135
130
125
120
J771
115
2 30
110
105
100
95
90
1 29
to PA unit J3
85
J201
29
30 GND GND
80
DTIF DRIF
GND D5VA
75
GND D5VA
GND D5VA
70
GND DMAF
GND GND 65
DTAF
AGC
GND DRAF 60
-8V GND
55
-8V GND
-5V GND
50
-5V GND
8V FMTL
45
GND
2 8V 1
to DSP-A
40
board J2001
35
2 1
30
J352
25
20
to DISPLAY
board J451
15
J641
10
4 ETE
ET14
5
ETST
1 ETKY
0
0 5
to EXT
TUNER
3LO
8 5
1 4
8 5
14 8
1 4
1 7
MP11
10 15 20 25 30 35 40 45 50 55 60 65 70
P1851
T/R2IF
21 1
J811
22 2
to RF-B unit J451
8 - 7
P701
from PLL unit J701
1 5
5
8
1 4
8 5
1 4
8 1
1 8
4 5
1
9 16
8
5 4
8 1
8 1
1 8
4 5
9 10
8 5
1
10
1 4
11 20
75 80 85 90 95 100 105 110 115 120 125 130
Horizontal
from RF-B unit J185
J741
22 14V
14V
14V
8 2
NC
J3502 T8V
NC
5V
5V
NC
-8V
NC
FORV
REFV
ANTS
DRES
GND
ISTA
IKEY
GND
FSTB
7 1 CMDT
2
CMCK
to optional
to CTRL-A unit J7
unit UT-102
8 5
1 4
65 64
16
9
37
36
9 8
102
103
16 1
8
9
5 4
128 1
8 1
16 1 87 86
128
65
1 14
1 20
1 64
7 8
1 14
10 11
7 8
1 20 32 33
10 11
11 10
22 1
20 1
11 10
23 44
20 1
135 140 145 150 155 160 165 170 175 180 185 190
J3504
J841
1 D7 D8
15 1
D6 D9
21
D5 D10
D4 D11
D3 D12
D2 D13
D1 D14
D0 D15
GND GND
GND GND
16 2
HWR GND
to PLL unit J1
RD GND
1
RD GND
CSs GND
CSf GND
15
J202
1 AGRS 3R3V_d 2
GND 3R3V_d
M5V_d GND
GND NSQO
DSDR DPGI
NC MODS
NC FMNS
MCK CALS
DSFW ACKS
MDAT DSRS
DSFR AMS
CTFL TXS
RTDT MSL1
GND DSKY
29 GND GND 30
to DSP-A
board J2002
J861
1 14V
14V 2
14V
NC
NC
NC
NC
SPE
AFO
SPE
TMD
PWRK
GND
GND
GND
GND
MICI
8V
MSND
MICE
NC
SQSS
23 NC
NC 24
to DISPLAY
board J321
J891
24 NC
23
NC
14V
14V
14V
NC
NC
NC
-8V
-8V
NC
GND
GND
GND
GND
YSYNC
HSYNC
B
G
R
YOBI
DRES
2 LMFD
LFMD 1
to DISPLAY
board J301
J3503
1 A9 A18 30
A8 A17
A7 A16
A6 A15
A5 A14
195 200
A4 A13
A3 A12
30
A2 A11
A1 A10s
A0 A10f
GND GND
RESET GND
BYTE GND
VCC GND
to MEMORY
VCC GND 16
board J2 15
to MEMORY
board J1
16