Icom IC-7700 Service Manual page 84

SECTION 8 WIRING DIAGRAM
• FRONT UNIT
J203
GND
1
GND
2
LRXD
3
LTXD
4
NC
5
LG_PWR
6
NC
7 DISPLAY
LG_RES
8
+3R3V
9
GND
10
GND BOARD
11
C15V
12
C15V
13
C15V
14
NC
15
+8V
16
MSND
17
GND
18
NC
19
VDD5VF
20
J605
SPE
2
I NTSP
1
J606
NC
3
SPE
2
I NTSP
1
OPC-875A
OPC-1838
W2
8900015940
W1
8900017300
SW-A
BOARD
VR-A
BOARD
J1
PHE PHE
10 1
PHO 9 2 PHO
PHE 8 3 PHE
NC NC
7 4
NC NC
6 5
W3
PHNI 5 6 PHNI
GND 4 7 GND
DASH DASH
3 8
DO T DOT
2 9
GND GND
1 10
MICI
J103
M ICE OPC-886A
PHO
8900015930
PHE
AFO
AF E
J2
MICI
MICI 10 1
M8 V
M8 V 9 2
8 3 MUD
MUD
SQLS
SQLS 7 4
MSND
MSND 6 5
W4 GND
GND 5 6
GND 4 7 GND
3 8 M ICE
M ICE
GND
GND 2 9
AFO
AFO 1 10
J104
OPC-1836
8900017280
CN2
J301
CFLH H
1 1
GND L
2 2
LCD
OPC-1332A-1
W1 3
8900014871
To LOGIC UNIT
OPC-1837 OPC-1825
OPC-909A W7
W6
W5 8900017290 8900017100
8900014720
SW-B
USB
VR-B
BOARD
BOARD
BOARD
12 11
To LOGIC
8 - 1
OPC-909A
8900014720
J1
J4
LDPS 10 LDPS
1
NC NC P1A
LED 2 9 1 10 P1A
TXD TXD P1B
3 8 2 9 P1B
RXD 4 7 RXD P2A 3 8 P2A
LCKD 5 6 LCKD P2B 4 7
W10 P2B
BOARD SPLD SPLD GND
6 5 5 6 GND
W1 1
NC NC GND
7 4 6 5 GND
NC NC NC
8 3 7 4 NC
NC 9 2 NC NC L 8 3
NC L
GND GND DGSL
10 1 9 2 DGSL
+3R3V
10 1 +3R3
J5
J1
OPC-886A
8900015930
J1
LST1 40 1 LST1
39 2
LDPS LDPS
NC 38 3 NC
J8
+5V 37 4 +5V
GND GND
NC 36 5 NC 1 10
DGSL 35 6 DGSL NC 2 9 NC
34 7 +3R3V 3 8 +3R3V
NCL NC L
GND GND
P2B 33 8 P2B 4 7
PITL PITL
P2A 32 9 P2A 5 6
W1 2
P1B 31 10 P1B NC 6 5 NC
30 11 NC 7 4 NC
P1A P1A
NC NC
PITL 29 12 PITL 8 3
NC NC
TSK 28 13 TSK 9 2
GND GND
KI0 27 14 KI0 10 1
KI1 26 15 KI1
J1
16 OPC-886A
KI2 25 KI2
KI3 24 17 KI3 8900015930
GND 23 18 GND
GND 22 W9 19 GND
21 20
NC NC
V
+3R3V 20 21 +3R3
NC 19 22 NC
KI5 18 23 KI5
KI4 17 24 KI4
25
GND 16 GND
GND 15 26 GND
RSA 14 27 RSA
RSB 13 28 RSB
12 29
UPK UPK
DWK 11 30 DW K
VMK 10 31 VMK
MPW K 9 32 MPWK
MWK 8 33 MWK
MPRK 7 34 MPRK
XFCK 6 35 XFCK
ABK 5 36 ABK
EQRK 4 37 EQRK
3 38
LDAT LDAT
LCK 2 39 LCK
LOE 1 40 LOE
J1
J7
1 1
+5V
RIT-SENSOR
RSB 2 2
RSA 3 3
EX-2500 #03
GND 4 4
J205
+5V
1 1
MAIN-SENSOR
MSB
2 2
MSA 3 3
RMS20-250-201- P
GND 4 4
OPC-886A
W8
8900015930
FRONT UNIT
VR-C
(page 10-1)
BOARD
V