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

8-6 MAIN-A UNIT (TOP VIEW)
2 1
J352
to DISPLAY
board J451
J641
4 ETE
ET14
ETST
1
ETKY
to EXT
TUNER
J201
30 GND GND 29
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
2 8V_ GND 1
to DSP-A
board J2001
J741
22 14V
21
14V
14V
NC
T8V
NC
5V
5V
GND
-8V
GND
FORV
REFV
ANTS
DRES
GND
ISTA
IKEY
GND
FSTB
CMDT
2
CMCK 1
to CRTL
unit J7
P741
T/R2IF
from RF-A unit J741
J3504
1 DB7 DB8 30
DB6 DB9
DB5 DB10
DB4 DB11
DB3
DB12
DB2 DB13
DB1 DB14
DB0 DB15
GND GND
GND GND
HWR GND 2
J771
RD GND
RD GND
CSa GND
CSf GND
15 16
to MEMORY
board J2
1
P701
3LO
from PLL unit J701
8 5
1 4
8 5
14 8
1 4
1 7
10
11
30 21
J811
22 to RF-A unit J951
to PA unit J3 29
8 - 10
1 5
5
8
1 4
5
8
4
1
8 1
1 8
4 5
1
9 16
8
5 4
8 1 9
8 1
1 8
4 5 16
9 16
9
16
8 5
1
1 4
20
1 8 2
J3502
7 1
2
to optional unit UT-102
5
8
1 4
65 64
16
9
37
36
8
102
103
1
8
5 4
128 1
8 1
1 87 86
128
65
1 14
1 20 1 64
7 8
1 14
10 11
7 8
11 10
32 33
12 1
11 10
22 1
20 1
11 10
23 44
20 1
15 1
J841
16 to PLL unit J1 2
J202
3R3V _ d
1 AGRS 2
3R3V _ d
GND
M5V _ d GND
GND NSQO
DSDR DPGI
UNSB MODS
NC FMNS
MCK CALS
DSFW ACKS
MDAT DSRS
DSFR AMS
CTFL TXS
RTDT MSL1
GND DSKY
30
29 GND GND
to DSP-A
board J2002
J861
14V
1
2
14V
14V
NC
NC
NC
NC
SPE
AFO
SPE
TMD
PWRK
GND
GND
GND
GND
MICI
8V
MSND
MICE
NC
SQSS
NC
23
NC 24
to DISPLAY
board J321
J891
24 NC
23
NC
14V
14V
14V
NC
NC
NC
-8V
-8V
NC
GND
GND
GND
GND
VSYNC
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
A4 A13
A3 A12
A2 A11
A1 A10
A0 A10
GND
GND
RESET GND
BYTE GND
BYTE GND
BYTE GND
15 16
to MEMORY
board J1