Icom IC-7400 Service Manual page 64

• MAIN UNIT
(TOP VIEW)
1
R703
R702
Q700
R700
C742
W740
2 1
J741
J741
to CTRL
unit J13
J1001
GND
22 DTIF 21
GND GND
L740 Q740
DRAF GND C740
C741
R740
GND GND
MONI DAGC
GND GND
8V 8V
GND GND
GND DTAF
J760
GND GND
DRIF GND 1
2
to DSP unit J901
C502
C503
J400
1 3LO
2 GND
to RF unit J1601
Q784
J782 C793
R790
R527
R525
R526 C501
IC200
R503 C500
R502 R501
R788
D783
J780
Q788
D722
R787
Q722
R727 R722
R726 R720
R783
D720
R789
J781
2
C1247
C1243
C1261
C1007
L1241 R1009 R1008
C1005 R1007
R1013
C1006
C1008
R1005
C1002
C1001
C1244
R1004 C1003
R1001
IC1240
C1242
C1240
C1141
W1220
R1221 R1141
R1222
C1221
C1040
C1191 C1192
C1041
C1061
R1062
R1180 C1180 R1040
R1064 C1063
C1082
R1183 C1182
C1190
C1087
R1182 C1183
R1181 C1181
C1085
C1080
C1161
C1188 C1184
C1160
C1140 R1140
R1160
CP1460
W1120
C1461
CP200 CP200
MP200
R215
Q204 R1469
C285
R218 R212
R220 C217
Q205
R210
C218
R217
C284
5
L280
R528
R522
R523
C208 R208
R521 R207 R209
R524
L200
R500
R223
R221
R222
R797
C796
R264
Q787
Q250
R257
Q200
R512
Q511
R724
D721
J100 J100
Q790
R780
C253
EP101 R252
R785
Q783
C111
R791
W15 (CHASSIS)
21 1
J100
22 2
to RF unit J2
9 - 5
L2020
C1302
C2020
C1303
R1301
6
C1020
R1315
R1314 R1300 R1304 R1021
R1312 R1310 R1302
R1313 R1311 J1620
D1300 J1620
R1303
IC1310 R1309
C1309
C1307
R1845
R1841
R1844
C1940
D1840 R1700
W1941
R1940
R1802
R1941
R1991
W1940
R1861
R1942 R1945
R1862
C1561
Q1860
R1801
C1510
C1507
C1511
R1800
C1509
X1500
W304
C1512
D1822
D1824 IC1500
D1825
D1826
R1741
C1500
R1108 R1740
C1505
R1100
R1512
R1511
R1102 R1510
R1905 R1509
R1906 R1508
R1907
R1507
C1100
R1902 R1506
R1903 R1883 R1505
R1106 C1108
R1904
C1504
C1102
R1909
C1502
R1105 C1800
D1901 R1882
C1503
C1760
R1852 R1840
C1841
R1853
C1840
R1804
Q450
J400 Q452
MP72
C1466
(CHASSIS)
C1467
R1464 R1462
L402 C408 7
R413
R404
C282 C283
R405
R326
IC400
R406
R408
D310
C401
R281
AMPO R320
R407 W400
C402
VPO
R317
L400
R400
D383
W270 50PO
R311
Q381
R385 R390
R384 R389 R306
C381 C383
R383 R388
C380 R387
R382 C382
R381 R386
R380
B5699J
R333
C264
R256
R258
R332 C332
DIP
R330 L330
C251
R251
D250 D251
L251 J250
8
P261
2IF
from RF unit J261
J761
C1406
R1404
C1404 C1401
R1412 R1414
C149
R143 R142
R1416
C148
R1418 C1412
R141
C1413
C147
R140
R1417
C146
R1403
R1425 R1424 C145
C1429
L143
R1962 C1481
R1967
R1970
C143
R1964
R1965
C142
R1968
R1966
R1972 C1281
R1969
R1971
R1987 C141
R1989
R1988
R1990 R1480
R1986 C1480
R1985
R1701 R1702 OPTION
R1843 C1920
W1610
R1920
W1609
W1608
R1924
W1607
W1606 R1922
W1605
W1604
W1603 R1925 R1923
W1602
W1601
W1600
UT-102
C1921
C2041 R2042
C192
IC2040
R183
R184
R182
C191
Q451 C190
C189
C188
Q453
C185
C184
C183
D363 D361
C362
D364
C180
R307
R308
D312 D303
D362
Q306
D311 D551
Q304
ICAPC
CP300
Q302 R555
R318
R562
W180
Q301
D550
D552 C160
Q300
R300
R321
D553
R324
R328
Q308
R327
C135
R124
C134
R123
C133
R122
C132
R121
C131
R120
L130
C129
L128
C126
L124
C125
W120
L123
C124
C123
J761 L121
C122
J761
L120
L760 C163
R160
C162 C161
C164
L761
C762
J160 J160
W14 (CHASSIS)
21 1
J160
J802
4 1
to CHASSIS MF1
to CHASSIS J1
22 2
to RF unit J1001
The combination of top side and bottom side of this
page shows the actual confi guration of P.C. board.
J140
3
CIKY
1
CIST 2
GND
CANT
GND
CDRS
GND
CREF
CFOR
GND
to CTRL
GND
C-8V
unit J7
GND
C5V
C5V
NC
GND
CT8V
GND
C14V
21 C14V
C14V 22
J1000
L141
1 GND NC 2
GND GND
DRQW DWBY
DCK DDTW
GND GND
DRQR DDTR
DRBY DSTR to DSP
GND
GND unit J902
CTFL NSQL
TOFF RTDT
VSQL DCBY
NC NC
GND GND
DSKY DSST
29 DRES GND 30
J1920
2 SSTB MDAT_UT 1
MCK_UT SBSY to optional
SPCE 5VL unit UT-102
8 SPCH GND 7
J180
1 FSPS
2
PAFO
PAFE
FLFM
FLMF
GND
FDRS
FPWK
SQL
SEND
MICE
to S-LOGIC
MIC
GND
board J601
-8V
GND
GND
5VL
5VL
GND
8V
21 GND
14V 22
J120
1 PPWS
PDRS 2
PFSB
R803 PMDT
PMCK
P5V
P5V
PH5V
D801
THML
C802 P8V
P8V
GND
PT8V
GND
to PA
PVRF
FVFR
unit J5
GND
PGND
PICL
PICH
P14A
P14A
J802
P14V
P14V
P14V
P14V
P14V
P14V
29 P14V
PHV 30
4
2 1