Icom IC-7400 Service Manual page 73

• S-LOGIC UNIT
CP603 CP604
FRONT UNIT
MAIN DIAL
EP1
J604
5VL
1 1
MUP
MAIN 2 2
MDN
DIAL 3 3
GND
4 4
CP521 CP523
CP522
J502
RUP RUP
10
5VL 5VL
9
RDN RDN
8
GND
7
To RIT BOARD GND
6
GND GND
5
GND
4
GND 3
GND
2
GND
1
CP502 CP504
CP503
CP505
CP501
J501
5VL 5VL
1
PB1A PB1A
2
PB1B PB1B
3
MCHA MUPK
4
To PBT BOARD MCHB MDNK
5
PB2A PB2A
6
PB2B PB2B
7
GND
8
GND
9
GND
10
CP571 CP573 CP576
CP572 CP574
J507
PAFE
1
PAFO PAFO
2
PAFE
3
GND R571
PHONE BOARD 4
PHNL
5
DASH 6 DASH
DOT DOT
7
GND
8
GND
9
GND
10
IC571
CP702 CP704
CP701 CP703 C701
C702
EP702
J508
MIC
10
M8V
9
MUD
8
SQLS
MIC BOARD 7
MSEND
6
GND EP703
5
MMICE
4
PAFO
3
NC
2
NC
1 C704
CP706 CP708
CP705 CP707
CP712
CP710
CP713
CP711 C703
J601
FSPS SPS
1
PAFO PAFO
2
PAFE PAFE
3
FLFM 4 LFMD
FLMF LMFD
5
GND
6
FDRS SRES
7
FPWK PWRK
8
SQL SQL
9
SEND SEND
10
MAIN UNIT MICE MICE
11
MIC MIC
12
GND
13
-8V 14 -8V_
GND
15
GND
16
5V 5VL
17
5V 5VL
18
GND
19
8V 8V
20
GND
21
14V 14V
22
S601
CP722 CP723 CP724
CP605
NR/NOTCH
R1
R2
[NOTCH/
R3
NR]
C2
C1
AF/RF
R4
R5
[AF/RF]
R6
C4
C3
P41
P42
D D
O A
T S
S
H
R
E
S
C571
D573
C572
5
1 R576
4
2
3
C705
5VL
CP714 CP715
MP1/MP2
L401
724 SHIELD CASE
724 SHIELD CASE FUTA
L601 D402
CP716
CP717
CP718
CP719
CP720
L403
CP721 C406
C409
L402
C407
[POWER]
C408
12 - 3
R104
R102 R103 IC101C
8
10
9
R101
C101
R108
R106 R107 IC101D
12
11
R8 13
[M_GIN]
PB4 R105
C102
R7 C5
PB3 IC102C
8
R10 C111 R111 10
[RF_P]
PB5 9
PB2
R9 C6 C112
1
4
IC102A
1 R112 IC102B
3 5
2 4
R12 6
[PITCH]
PB6 7
PB1 C113
R11 C7
PB0 5 IC101B IC102D
4 12
6 R113 11
13
R14
[K_SPD]
PB7
C114
R13 C8
P P P
5 5 5
0 1 2
S1 S2
TRANSMIT TUNER ANT
R15
R16 R17
S8 S9
KI0
C9 P.AMP/ATT NB
R401
IC401
1 CD 8 R402
CS
2 SI 7
ES
3 V+ 6
CT
4 INVIN 5
GND
C405
R404
R403
C403 C401
C404 C402
5VL
MP3/MP4
P15 MP3 SHIELD CASE(A)
MP4 SHIELD CASE(A)FUTA(A)-1
R307
L301
C307
C306 R302
C302
Q302
P17
Q301
R301
P14
L303
R306
D301 L302
C305
C115 R304 R305
C304
C303
4 IC101A R303
1
3
P16
2
7
Q303 Q304
P21
CP306
CP307
CP308
CP309
CP310
CP311
CP312
CP313
CP314
CP315
CP316
CP317
CP318
P P P P
5 5 6 6
3 4 6 7
S3 S4 S5 S6 S7
NR A/NOTCH CALL LOCK
PB0
CP329 PB1
CP330
PB2
CP331
PB3
CP332
R18 PB4
CP333
PB5
CP334
PB6
CP335
PB7
CP336
S10 S11 PC2
CP337
DASH
CP338
DOT
CP339
P54
CP340
VOX MONI P53
CP341
P52
CP342
P51
CP343
P50
CP344
KI0
CP345
CP346
CP347
NOTICE: Refer to the PARTS LIST for the value and name of each component.
CP302 CP301
To CFL
CFL+
J303
CFL-
1
2
3
4
CP303
CP304
CP305
J301
5VL 5VL
1
5VL 5VL
2
3 GND
P14 P14 BKL
4
P15 P15 RSA
5
P16 P16 MSA
6
P17 P17 RSB
7
P41 LMFD
8
P42 LFMD
9
P21 P21 MSB
10
GND
11
PB1A PB1A PB1A
12
PB1B PB1B 13 PB1B
MDNK MDNK MCHB
14
MUPK MUPK MCHA
15
SRES SRES SRES
16
-8V -8V -8V
17
P67 P67 LOCK
18
P66 P66 SPEK
19
-8V -8V
20
8V 8V
21
GND
22
To DISPLAY BOARD
CP325 CP328
J302
PB0 AFL
22
PB1 RFL
21
PB2 NRL
20
PB3 APFL
19
PB4 MIGL
18
PB5 PWRL
17
PB6 RITL
16
PB7 KYSL
15
PC2 14 MUD
DASH DSHK
13
DOT DOTK
12
P54 APFK
11
P53 NRK
10
P52 ANTK
9
P51 TUNK
8
P50 TRAK
7
KI0 KIOI
6
PB2A PB2A
5
PB2B PB2B
4
GND
3
GND
2
CP348 GND
1
To DISPLAY BOARD