Ctrl Unit; Tuner Unit; Pa Unit; Dsp Unit - Icom IC-7400 Service Manual

SECTION 11. GENERAL WIRING
RF UNIT
J261
J1601
J1001
W14
P1601 8900009271
P261
OPC-912A
J400
J250
J160
J1001 J901
2 1 1 2
DRIF GND DSPI1 GND
GND GND GND GND
GND DTAF GND DSPI2
GND GND GND GND
8V 8V 8V 8V
GND GND GND GND
MONI DAGC AGC2 AGC1
GND GND GND GND
DRAF GND DSPO1 GND
GND GND GND GND
GND DTIF GND DSPO2
22 21 21 22
J1 P2 J761
1
EKEY
EKEY
2
EST EST
3
E14V E14V
4
EGND
EGND
DISPLAY BOARD
J505 J503
W22 W21
8900009271
8900009271
OPC-912A
OPC-912A
J1 J1
MODE BOARD TEN-KEY BOARD
HRX
J1 P2
HRX
J121 P601 J601
VRX VRX
J151
P1 J1
YGR YGR
J2
J5
W15
W16
8900009271 8900015500
OPC-1113A
OPC-912A
J120
J100
J902 J1000
2 1 1 2
GND1 192K GND NC
GND1 GND1 GND GND
RQI IBSY DROW DWBY
CK DI DCK DDTW
GND1 GND1 GND GND
DSP
RQO DO DROR DDTR
MAIN UNIT
OBSY STBO DRBY DSTR
GND1 GND1 GND GND
OUT1 OUT2 CTFL NSOL
UNIT
OUT3 OUT4 TOFF RTDT
OUT5 OUT6 VSOL DCBY
OUT7 OUT8 NC NC
GND1 GND1 GND GND
KEYIN UNLK DSKY DSST
DRES GND1 DRES GND
30 29 29 30
W19
8900009271
J1001
OPC-912A
5VL
5VL
GND
BKL
RSA
MSA
RSB
LMFD
LFMD
MSB
GND
PB1A
PB1B
MCHB
MCHA
SRES
-8V
LOCK
SPEK
-8V
8V
GND
J1002
AFL
RFL
NRL
APFL
MIGL
PWRL
RITL
KYSL
MUD
DSHK
DOTK
APFK
NRK
ANTK
TUNK
TRAK
KIOI
PB2A
PB2B
GND
GND
GND
8900015160
OPC-916A
CFL+
DS1002
CFL-
FRONT
11 - 1
W12
8900007160
EP6 EP5
OPC-700
H14V
H14V
GND
GND
W13
EP4
EP7
8900007170
FILTER
OPC-701
BOARD
J7
144MHz
1
ANT
2

PA UNIT

J502
CTIN
MF+
MF-
J802
W17
8900015510
J140 OPC-1114A
C14V
C14V
C14V
GND
CT8V
GND
NC
C5V
C5V
GND
C-8V
GND
GND
CFOR
CREF
GND
CDRS
GND
CANT
GND
CIST
CIKY
J741
P3
SSP
PAFE
J180
W18
8900015160
OPC-916A
J601
J301
5VL
5VL
GND
BKL
RSA
MSA
RSB
LMFD
LFMD
MSB
GND
PB1A
PB1B
MCHB
MCHA
SRES
-8V
LOCK
SPEK
-8V
8V
GND
W20
J302
S-LOGIC BOARD
AFL
RFL
NRL
APFL
MIGL
PWRL
RITL
KYSL
MUD
DSHK
DOTK
APFK
NRK
ANTK
TUNK
TRAK
KIOI
PB2A
PB2B
GND
GND
GND
J303
J502
CFL+
NC
NC
W24
W25
CFL-
8900009231
8900009660
OPC-908A
OPC-964
J1
RIT BOARD
EP1
EP3
P14V
P14V
EP2
PGND
PGND
EP2 P1
ANT1 ANT2
3 6
2 5
J5 2 J6 2
1 4
1 1
J2
CHASSIS
HRX
P501
J1
CTIN
J14 P3
SSP
PAFE
MF1
J3 P3
TUIN
P4
J4
TUOT
W23
8900015160
OPC-916A
J8
GND
CTRL GND
35M
7M
10M
14M
UNIT
J7
18M
24M
C14V VHF
C14V GND
C14V GND
GND 14V
CT8V 14V
GND CO3
SETI CO2
C5V CO1
C5V NVHF
GND CI3
C-8V CI2
GND CI1
GND GND
CFOR GND
CREF
GND
CDRS
GND
J10
CANT
GND T14V
CIST PW
CIKY PX
PY
PZ
J13
J11
SSP
PAFE T14V
AW
AX
AY
AZ
J508 J501 J507
W27
W26
8900009231
8900009231
OPC-908A
OPC-908A
J2 J1 J3
PHONE
BOARD
MIC BOARD PBT BOARD
SP1
J3
TUIN
J4
TUOT
J5
GND
GND
35M
7M
10M
14M
18M
24M
TUNER
VHF
GND
GND
14V
14V UNIT
CO3
CO2
CO1
NVHF
CI3
CI2
CI1
GND
GND
T14V MF1
PW
PX
PY
PZ
T14V
AW MF2
AX
AY
AZ
J604 EP1
5VL
MUP MAIN
MDN DIAL
GND