Main Unit - Icom IC-756PRO Service Manual

8-6 MAIN UNIT (TOP VIEW)
29 to PA unit J3
J771
30
SEND
ALC
2 1
J352
to DISPLAY
board J451
J201
30 29
GND GND
EXSP
DTIF DRIF
GND D5VA
GND D5VA
GND D5VA
GND DMAF
GND GND
AGC DTAF
REMOTE
GND DRAF
−8V
GND
−8V
GND
−5V
GND
−5V
GND
8V FMTL
8V GND
2 1
KEY
to DSP
board J2001
J641
4
ETE
ET14
ETST
ETKY
1
to EXT
TUNER
J741
1
14V
2
14V
14V
NC
T8V
NC
5V
5V
NC
to CTRL −8V
unit J7 NC
FORV
REFV
ANTS
DRES
GND
ISTA
IKEY
GND
FSTB
CMDT
21
CMCK
22
from RF unit J741
1
P701
3LO
2
5
8
1 4
8 5
C363
1 4
+
14 8
1 7
14 8
8
1 7
9
R241,C245
R247
10 1
11 20
2 22
P741
J811
T/R2IF
1 to RF unit J951 21
8 - 10
from PLL unit J701
1 5
1 2
C453
+
C316
+
8 5
1 4
8 1
1 8
4 5
1 16
9 16
8 9
5 4
8 1
9 8
1 1 8
W3014
16 1
4 5
16
9 8
16 1
1
7
1
7
5
8
1
4
2
J841
Side View
R241 Q241
C245
1 to PLL unit J1
8 5
1 4
65 64
39
38
102
103
5 4
128 1
8 1
97 96
128
65
14
1 20
1 64
+
8
14
10 11
C3513
8
1 20
32 33
10 11
11 10
22 1
20 1
11 10
23 44
1
20
16
15
J1702
1
H5V
2
FZRX
FZTX
FZRS
FZVP
FZMD
FRMD
GND
GND
9
GND
10
J202
30 29
GND GND
DSKY GND
MSLI RTDT
to DSP
board J2002
TXS CTFL
AMS DSFR
DSRS MDAT
ACKS DSFW
J861
CALS MCK 24
14V
23
14V
FMNS NC
14V
NC
MODS NC
NC
NC
DPGI DSDR
NC
SPE
NSQO GND
AFO
SPE
GND M5V_d
TMD
PWRK
3R3V_d GND
GND
GND
3R3V_d AGRS
2 1 GND
GND
MICI
8V
MSND
MICE
AFO
SQSS
NC
2
NC
1
to DISPLAY
board J321
J891
1
NC
2
NC
14V
14V
14V
NC
NC
NC
−8V
−8V
NC
GND
GND
GND
GND
VSYNC
HSYNC
B
G
R
YOBI
DRES
LMFD
23
LFMD
24
to DISPLAY
board J301
J3504 J3503
1 30 1 30
D7 D8 A9 A18
D6 D9 A8 A17
D5 D10 A7 A16
D4 D11 A6 A15
D3 D12 A5 A14
D2 D13 A4 A13
D1 D14 A3 A12
D0 D15 A2 A11
GND GND A1 A10
GND GND A0 A10
HWR GND GND GND
RD GND RESET GND
RD GND BYTE GND
CS0 GND Vcc GND
CS3 GND Vcc GND
15 16 15 16
to MEMORY to MEMORY
board J2 board J1