Icom IC-7400 Service Manual

12 - 1
SECTION 12 VOLTAGE DIAGRAM
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
a
b
c
d
e
f
g
h
i
CP328
P14
P15
P16
P17
P41
P42
P21
PB1A
PB1B
MDNK
MUPK
SRES
- 8V
P67
P66
- 8V
PB0
PC2
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC2
DASH
DOT
P54
P53
P52
P51
P50
KIO
CP348
CP303
CP304
CP305
5VL
5VL
8V
P14
P42
P41
P15
P16
P17
P21
PB1A
PB1B
MDNK
MUPK
SRES
P67
P66
- 8V
C305
12p
L303
D818HN-1107
C304 0.047
CP306
CP307
CP308
CP309
CP310
CP311
CP312
CP313
CP314
CP315
CP317
CP318
CP316
Q304
2SC3647
R305 3.3k R304 3.3k
L302
100µ
D301
RD3.0M
Q303
2SC3647
C303 47 R303 220
Q301
2SC4081
Q302
2SB1201
C302 10
C307 10
R302 33k
R306
4.7k
R301
6.8k
P14
CP329
CP330
CP331
CP332
CP333
CP334
CP335
CP336
CP338
CP339
CP340
CP341
CP342
CP343
CP344
CP345
CP337
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
DASH
DOT
P54
P53
P52
P51
P50
KIO
CP346
CP347
PB2A
PB2B
PC2
P16
1
2
3
IC101a
MC14071BFEL
4
6
5
IC102b
BU4030BF
C113 0.001
R112
47k
IC102d
BU4030BF
12
13
11
C114 0.001
R113
15k
IC102c
BU4030BF
9
10
C112 0.001
R111
15k
8
IC102a
BU4030BF
1
2
3
14
7
5
6
4
IC101b
P21
11
13
12
R108 1M
R106
220k
R107
100k
R105 100k
C102 0.001
IC101d
8
10
9
R104 1M
R102
220k
R103
100k
C101 0.001
IC101c
R101 100k
P17
P15
C111 0.1
C5 0.0047
R8
1k
R7 EVU-FLAED7B14
PB4
C6 0.0047
R9 EVU-FLAED7B14
R10
1k
PB5
[MIC
GAIN]
[RF
PWR]
C7 0.0047
R11 EVU-FLAED7B14
R12
1k
PB6
[CW
PITCH]
C8 0.0047
R13 EVU-FLAED7B14
R14
1k
PB7
[KEY
SPEED]
L301 100µ
PB3
PB2
C2 0.0047 C1 0.0047
R3
1k
R2
1k
R1 RV-308
[NOTCH]
[NR]
NR/NOTCH
PB1
PB0
C4 0.0047 C3 0.0047
R6
- 8V
8V
5V
1k
R5
1k
R4 RV-308
[AF]
[RF
]
[AF/RF]
P67
S7
SKQDPA
[LOCK/SPCH]
P66
S6
SKQDPA
[CALL]
P54
S5
SKQDPA
[A/NOTCH]
P53
S4
SKQDPA
[NR]
P52
S3
SKQDPA
[ANT]
P51
S2
SKQDPA
[TUNER]
P50
S1
SKQDPA
[TRANSMIT]
S11
SKQDPA
[MONITOR]
S10
SKQDPA
[VOX/
BK-IN]
R18 15k
S9
SKQDPA
[NB]
R17 4.7k
S8
SKQDPA
[P.AMP/
ATT]
R16 2.2k
R15
6.8k
C9
0.1
KI0
C401
0.1
C402
470
R403
8.2k
INVIN
V+
SI
CD
GND CT ES CS
1 2 3 4
8 7 6 5
R402 1 R401 1
R5 10k R4 10k R3 10k R2 10k
R7 10k R6 10k
IC401
NJM2360AM
C405
270p
C403
0.1
C404
220
L402
D10F-A814AY-221K
C407
0.1
L401
L601
SLF7032T-101MR45-2
D10F-A814AY-681K
C406 220
D402
SB10-05PCP
L403
D10F-A814AY-681K
C409 10 C408 0.1
C703 100p C701 100p C702 100p C704 100p
CP721
CP720
CP719
CP718
CP717
CP716
CP715
CP714
CP713
CP712
CP711
CP710
SPS
PAFO
PAFE
LFMD
LMFD
SRES
PWRK
SQL
SEND
MICE
MIC
- 8V_
5VL
5VL
8V
14V
S601 SKQDPA
[POWER]
CP724CP723CP722
CP708
CP707
CP705
CP706
CP704
CP702
CP701
R571
22k
C572 0.1
IC571
TC4S71F
1
2
4
3
5
C571 0.47
R576 100k
CP301
CP302
CP571
CP572 CP574
CP573 CP576
CP505
CP504
CP503
CP502
CP501
CP523
CP522
CP521
PAFO
MMICE EP703
GND
MSEND
SQLS
MUD
M8V
MIC
EP701
GND
GND
GND
PB2B
PB2A
5VL
GND
GND
GND
GND
GND
GND
GND
RDN
5VL
RUPJ502
J501
J507
J508
J601
J301
J302
J303
KI2
KI3
KI4
KI5
KI6
KI7
XFCK
MPWK
MPRK
TXD
RXD
LOCD
SPLD
FIND
MNUK
F1K
F2K
F3K
F4K
F5K
SSBK
CWRK
AFMK
FILK
5VL
LDV
CP6
CP7 CP8
CP9
CP10
CP5
CP4 CP3
CP2 CP1
F2K F1K
J604
CP604
CP8 CP7 CP6 CP5 CP4 CP3 CP2 CP1
CP9
CP10
CP11
CP12
CP13
CP14
CP15
CP16
KI2
R1
6.8k
C1
0.1
R4 2.2k
R7 4.7k
R11 15k
KI3
R2
6.8k
R10 15k
C2
0.1
R5 2.2k
R8 4.7k R9 4.7k
R6 2.2k
C3
0.1
R12 15k
R3
6.8k
KI4
R16 2.2k
R17 4.7k
C4
0.1
R18 15k
R15
6.8k
KI5
DS5
CL-220YG
DS4
CL-220YG
DS3
CL-220HR
FIND
SPLD
LOCD
MPRK
DS2
CL-220YG
RXD
DS1
CL-220HR
TXD
MPWK
XFCK
R19
6.8k
KI6
C5
0.1
R20
2.2k
R20
2.2k
R21 4.7k
R23
6.8k
C7 0.1
KI7
R24
2.2k
R25
4.7k
MNUK
F1K
F2K
F3K
F4K
F5K
SSBK
CWRK
AFMK
FILK
F3K F4KMNUK
F5KSSBK
FILK AFMK
MODE BOARD
TEN-KEY BOARD
MIC
M8V
MUD
SQLS
MSEND
GND
MMICE
PAFO
CP8 CP7 CP6 CP5
CP1 CP2 CP3 CP4
L4 100µ
L3 100µ
L6 100µ
L1 100µ
C7 100p
C6 0.0047
C5 0.0047
C4 0.0047
C3 0.0047 C2 0.0047
8
1
2
3
4
5
6
7
J1
FM214-BSS(P)
C1
0.0047
MIC BOARD
MIC
M8V
MUD
SQLS
MSEND
GND
MMICE
PAFO
CP5 CP4 CP3 CP2 CP1
L2
HF50ACC322513-B
L1
HF50ACC322513-B
R2 180
R1 180
C3 0.0047
R3 1k
C2 0.0047
C5 0.0047 C4 0.0047
C1 0.0047
J1
HLJ5305-01-4090
J2
HLJ7000-01-3010
PHONE BOARD
PAFE
PAFO
PAFE
PHNL
DASH
DOT
to
MAIN
DIAL
MIC
M8V
MUD
SQLS
MSEND
GND
MMICE
PAFO
CP1CP2CP3CP4CP5
5VL
PB1A
PB1B
MCHA
MCHB
A
B
COM
S1
TP90N00E20-22.5-2494
[M-CH]
[PBT]
PBT BOARD
RUP
5VL
RDN
CP1CP2CP3
COM
NC
B
A
1
3
2
A
B
COM
PBT2
PBT1
PB2A
PB2B
MCHA
MCHB
GND
GND
GND
PB1A
PB1B
A
S2
TP90D96E20-30F-2178-1
5
B
6
COM
4
1
3
2
1
2
3
4
S1
EVQ-VCJF0324B
RIT BOARD
5VL
PB1A
PB1B
MCHA
MCHB
PB1A
PB1B
MCHA
MCHB
PB2A
PB2B
GND
GND
GND
RUP
5VL
RDN
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
5VL
PB1A
PB1B
MCHA
MCHB
RUP
5VL
RDN
PB2A
PB2B
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
to
MAIN
unit
J1334
J1
J1
J3
J2
GND
GND
GND
GND
PAFE
PAFO
PAFE
PHNL
DASH
DOT
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
PB2A
PB2B
GND
GND
GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
PB2A
PB2B
GND
GND
GND
J1
J1
DASH
DOT
RDN
RUP
SRES
MUP
MDN
RDN RUP
CP603
MUP
MDN
CP605
5VL
PAFO
PAFE
PAFE
GND
PHNL
DASH
DOT
GND
GND
GND
CP703
PC2 P42 P41
D573
DA221
C306 1
CP325
14
7
C115 0.1
CFL
DS1002
MBS 3 UA1W 70N ASSY
NC
NC
F2 F1
F3 F4
F5 MENU
SSB
CW/
RTTY
CWRK
AM/
FM
FILTER
W19
W20
W25 W27 W26 W24
W22
W21
F-INP
7
3.5
1.8
SPLIT
18
14
10
A/B
28
24
21
TS
144
50
GENE
MP-R
MP-W
XFC
RIT TX CLEAR MW M-CL
V/M CALL
PAFE
PAFO
PAFE
GND
PHNL
DASH
DOT
GND
GND
GND
CFL+
CFL
-
R404 1.5k
CFL+
CFL
-
[PHONES]
[ELEC-KEY]
[RIT/ TX]
X
3
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
B
C
C1006 0.1
13
14
15
12
1
5
2
4
6
11
10
9
78
16
VDD
GND GND
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7
R1132 100k
R1131
1k
R1133
1k
R1134
1k
IC1002
BU4051BCF
D1002
MA2S111
CP1018
CP1017
CP1008
CP1007
CP1006
CP1005
CP1004
CP1003
CP1002
CP1001
5VL
5VL
GND
BKL
RSA
MSA
RSB
LMFD
LFMD
MSB
BKL
RSA
MSA
RSB
LMFD
LFMD
MSB
GND
PB1A
PB1B
MDNK
MUPK
SRES
- 8V
8V
GND
SPEK
LOCK
SPEK
LOCK
- 8V
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
CP1016
CP1015
CP1013
CP1014
CP1011
CP1012
CP1009
CP1010
CP1025CP1032CP1031CP1026
CP1024 CP1023
R1137 1k R1135 1k
R1138 47k R1136 47k
CP1027
CP1050 CP1051
CP1021CP1022
CP1042
CP1043
CP1044
CP1045
CP1046
CP2001
P50 P51 P52 P53 P54 P66 P67
C1205 0.0047
R1208 1k
AFL
RFL
NRL
APFL
MIGL
PWRL
RITL
KYSL
MUD
DSHK
DOTK
APFK
NRK
ANTK
TUNK
TRAK
KIOI
AFL
RFL
NRL
APFL
MIGL
PWRL
RITL
KYSL
MUD
DSHK
DOTK
APFK
NRK
ANTK
TUNK
TRAK
KIOI
PB2A
PB2B
GND
GND
GND
KI0
DISPLAY BOARD
J1001
J1002
R1207 1k R1206 1k R1205 1k R1204 1k R1203 1k R1202 1k R1201 1k
CP1020
SRES
MDNK
MUPK
S-LOGIC UNIT
(page 28)
• FRONT UNIT (1/2)
NOTICE: Refer to the PARTS LIST for the value and name of each component.

Icom IC-7400 Specifications

General

Frequency Range TX	1.8-54 MHz
Frequency Range RX	0.03-60 MHz
Modes	SSB, CW, RTTY, AM, FM
Output Power	100W (HF/50MHz), 50W (144MHz)
Receiver Type	Triple conversion superheterodyne
Antenna Connector	SO-239
IF Rejection	More than 70 dB
Supply Voltage	13.8 V DC ±15%
Current Drain RX	1.5 A
Image Rejection	More than 70 dB
Audio Output Power	2 W
Current Drain TX	20 A
Sensitivity	0.13 μV (SSB/CW)
Selectivity	SSB: 2.4 kHz