Icom IC-7400, Service Manual, Page: 83 / 92

11 - 1
SECTION 11 WIRING DIAGRAM
PHONE
BOARD
PBT BOARD MIC BOARD RIT BOARD FRONT TEN-KEY BOARD MODE BOARD
W22
J505 J503
J1 J1
W21
DS1002
J303
CFL-
CFL+
GND
GND
GND GND
CFL-
CFL+
NC
NC
J1
J502
W24 W25
J2
J508
J1
J501
W26
J507
J3
W27
DIAL
MAIN
EP1 J604
GND
MDN
MUP
5VL
S-LOGIC BOARD
PB2B
PB2A
PB2B
PB2A
J1002 J302
W20
GND GND
KIOI KIOI
TRAK TRAK
TUNK TUNK
ANTK ANTK
APFK
NRK
NRK
APFK
DOTK DOTK
DSHK DSHK
MUD
MUD
KYSL
KYSL
RITL RITL
PWRL PWRL
MIGL MIGL
APFL
APFL
NRL NRL
RFL RFL
AFL AFL
GND GND
8V 8V
-8V -8V
DISPLAY BOARD
J601
J301 J1001
W19
W18
SPEK SPEK
LOCK LOCK
-8V -8V
SRES SRES
MCHA MCHA
MCHB MCHB
PB1B PB1B
PB1A PB1A
GND GND
MSB MSB
LFMD LFMD
LMFD LMFD
RSB RSB
MSA MSA
RSA RSA
BKL BKL
GND GND
5VL
5VL
5VL
5VL
MF2
MF1
J11
J10
AZ
AY
AX
AW
T14V
PZ
PY
PX
PW
T14V
GND
GND
CI1
CI2
CI3
AZ
AY
AX
AW
T14V
PZ
PY
PX
PW
T14V
GND
GND
CI1
CI2
CI3
J13
PAFE
SSP
CIKY
CIST
CANT
CDRS
CREF
CFOR
C-8V
GND
GND
GND
GND
GND
GND
P3
J741
SSP
PAFE
CIKY
CIST
CANT
CDRS
CREF
CFOR
C-8V
GND
GND
GND
GND
GND
GND
J180
MAIN UNIT
DSP
UNIT
E14V
EST
J761
EGND
EKEY
J1
1
4
3
2
P2
EGND
E14V
EST
EKEY
J250
J160
J400
P1601
3LO
W14
J100
W15
J120
W16
J140
J802
C5V
C5V
CT8V
C14V
C14V
C14V
GND
NC
GND
J7
SETI
C5V
C5V
CT8V
C14V
C14V
C14V
W17
GND
GND
J4
P4
J4
J5
J8
GND GND
W23
TUOT TUOT
NVHF
CO1
CO2
CO3
14V
14V
GND
VHF
24M
18M
14M
10M
7M
35M
GND
GND
NVHF
CO1
CO2
CO3
14V
14V
GND
VHF
24M
18M
14M
10M
7M
35M
GND
GND
J3
P3 J3
SP1 P3
J14
J2
PAFE
SSP
TUIN TUIN
HRX
J1
P501
CTIN
MF1
J502
144MHz
ANT
MF-
MF+
CTIN
J5
J1
YGR
PA UNIT
CTRL
UNIT
TUNER
UNIT
J2
P1
J151
YGR
J1001
J1601
3LO
RF UNIT
J261
2IF
2IF
P261
P2
P601
J121
J1
HRX
VRX
J601
HRX
VRX
EP5
EP4
EP7
EP6
J7
2
1
W13
W12
GND
H14V
FILTER
BOARD
GND
H14V
P1
EP3
EP2
J6
2
1
J5
2
1
PGND
P14V
PGND
P14V
1
2
3
4
5
6
EP2
EP1
ANT2 ANT1
CHASSIS
GND GND GND DO
T
DA
S
H
PHNL GND P
AFE
P
AFO
P
AFE
GND GND GND PB2B PB2A MCHB MCHA PB1B PB1A 5VL MIC M8V MUD SQLS MSEND GND MMICE P
AFO
MIC M8V MUD
SQLS
MSEND
GND
MMICE
P
AFO
NC NC
NC NC
MPWK XFCK MPRK TXD RXD LOCD SPLD FIND GND GND GND GND GND GND KI7 KI6 KI5 KI4 KI3 KI2 5VL LD
V
FILK AFMK GND GND GND GND GND GND GND GND GND GND GND GND CWRK SSBK F5K F4K F3K F2K F1K MNUK
FILK
AFMK
GND GND GND GND GND GND GND GND GND GND GND GND
CWRK SSBK
F5K F4K F3K F2K F1K
MNUK
MPWK XFCK
MPRK
TXD
RXD
LOCD
SPLD
FIND GND GND GND GND GND GND
KI7 KI6 KI5 KI4 KI3 KI2 5VL LD
V
RU
P
5VL RND GND GND GND GND GND GND GND
RU
P
5VL RDN GND GND GND GND GND GND GND
GND GND GND PB2B PB2A
MCHB MCHA PB1B PB1A
5VL
GND GND GND DO
T
DA
S
H
PHNL GND P
AFE
P
AFO PAFE
GND -
8V
MIC
MICE
SEND
SQL
FPWK
FDRS
GND
FLMF FLFM PA
F
E
P
AFO
FSPS
GND GND 5VL 5VL GND
8V
GND 14V
GND -
8V
MIC MICE SEND SQL FPWK FDRS GND FLMF FLFM PA
F
E
PA
F
O
FSPS GND GND 5VL 5VL GND 8V GND 14V
PGND
GND PICL
PICH P14A P14A P14V P14V P14V P14V P14V P14V P14V
PHV
PVFR PVRF GND PT8V GND
P8V P8V
THML PH5V
P5V P5V
PMCK PMDT PFSB PDRS PPWS
MF+ MF
-
PGND GND PICL PICH P14A P14A P14V P14V P14V P14V P14V P14V P14V PHV PVFR PVRF GND PT8V GND P8V P8V THML PH5V P5V P5V PMCK PMDT PFSB PDRS PPWS
AG
C
TNV2
ALC
GND
5V
GND
R8V
GND
T8V
GND
8V
GND
14V -
8V
TNV1 R
TXS
RSKY DRIV RDRS RBST RMDT RMCK
AG
C
TNV2 ALC GND 5V GND R8V GND T8V GND 8V GND 14V -
8V
TNV1 R
TXS
RSKY DRIV RDRS RBST RMDT RMCK
GND LDRS
UNLC
GND GND
5V 5V
GND
8V 8V
GND
14V 14V
FCNT
PST1 PST2 PST3 PST4 PST5 PD
A
T
PCK
CON2
GND LDRS UNLC GND GND 5V 5V GND 8V 8V GND 14V 14V FCNT PST1 PST2 PST3 PST4 PST5 PD
A
T
PCK CON2
J902
GND1
KEYIN
OUT7
OUT5
OUT3
OUT1
GND1
OBSY
RQO
GND1
CK
RQI
GND1
GND1
DRES
GND1
UNLK
OUT8
OUT6
OUT4
OUT2
GND1
STBO
DO
GND1
DI
IBSY
GND1
192K
GND1
J901
GND
GND
DSPO1
GND
AGC2
GND
8V
GND
GND
GND
DSPI1
DSPO2
GND
GND
GND
AGC1
GND
8V
GND
DSPI2
GND
GND
J1000
GND
DSKY
NC
VSOL
TOFF
CTFL
GND
DRBY
DROR
GND
DCK
DROW
GND
GND
DRES
GND
DSST
NC
DCBY
RTDT
NSOL
GND
DSTR
DDTR
GND
DDTW
DWBY
GND
NC
GND
J1001
2
1
22 21
1 2
21 22
2 1
30 29
1 2
29 30
GND
GND
DRAF
GND
MONI
GND
8V
GND
GND
GND
DRIF
DTIF
GND
GND
GND
DAGC
GND
8V
GND
DTAF
GND
GND