Icom IC-7400 Service Manual page 75

• MAIN UNIT (2/3)
R1424 R1425
MIC
MIC
MICE
MICE
MIGV
MIGV
ACCMOD
ACCMOD
L1401 C1400 R1402
TIF
MIC 1
TIF
VCC2
RIF
2
RIF +IN
3
-IN
AGC 4
AGC OUT
5
R1401 GND
MSL1
MSL1
C1402
MSL2
MSL2
MONV
MONV
SPCH
SPCH
FMTL
MICE
FMTL
MODS
MODS
R1283
AAFO
AAFO
AFG1V
AFG1V
C1283
AFG2V
AFG2V
AFMS
AFMS
PAFO
PAFO
IC1280
PAFE
2
PAFE R1280 C1280
1
DOUT
3
DOUT
SQLS
SQLS
R1282
BEEP
BEEP
STON
STON C1282
VOXL
VOXL C1285
AVXL
6
AVXL
R1281
7
DATA
5
DATA C1281
OVDK IC1280
OVDK
9K6S
9K6S
AMS
AMS
W1120
DRAF
C1002
R1007
IC1001
2
R1005
1
R1002 R1003
R1004
3
C1004
R1006
C1001
R1102
R1100
DTIF
9
R1103 R1104
8
10
IC1120
8V
R1411
IC1400
10
VCC C1407 R1407
IC1401
9 2
VCAOUT R1412 R1414
8 1
VC
7 3
VCAIN R1408
6
NC
C1404
C1408
W1401
IC1310
1
Y1 VDD
2
Y0
3
Z1
4
Z
5
R1480
Z0
6
INH
7
VEE
8 8
VSS
V+
IC1280
V- CD4053B PWR
4
R1286
5V
-5V -5V
C1180
C1181
C1183
C1182
5 4
6 3
7 2
8 1
C1161
IC1160
C1008
8
V+
C1006
GND
6 4
7
IC1001
5
IC1001
C1104
IC1120
2
IC1120
6
1
R1105 R1106 R1107
7 3
5
4
V+
IC1120
V-
11
IC1120
13
14
12
12 - 5
C1416
C1413
C1417
IC1401
IC1401
6 9
7
C1412
R1415 R1417 R1418
5 10
R1416
R1419
16
15
Y
14
X
13
X1
12
X0
11
A
10
B
9
C R1307
C1301
2 D1300
1
C1304
3
R1308
R1305
4
IC1300 V+ IC1300
GND
11
13
14
12
IC1300
AFG1V
8V
5V
-5V
R1180
R1181
C1186 R1187 C1188
R1182
R1183
R1188
HR1487
IC1180
R1185
1 10
VCC2 VCC
2 9
R1184 +IN VCAOUT
R1186 3 8
-IN VC
4 7
OUT VCAIN
5 6
GND NC
C1185
C1189
R1110
J1001
J1000
1 2 2 1
3 4 4 3
5 6 6 5
DCK
7 8 8 7
9 10 10 9
11 12 12 11
13 14 14 13
15 16 16 15
17 18 18 17
19 20 20 19
21 22 22 21
23 24
25 26
27 28
29 30
ANALOG
DIGITAL
R1463
R1460 IC1460
8
V+
C1464
V-
8 4
4
IC1401 V+ C1465
R1462 R1464
C1470
V-
11
R1465
9
6
8
R1312 R1313
C1308
7 10
5
IC1300
IC1300
fc=10KHz
AFG2V
CP1245 CP1244
R1222
IC1240
IC1220
1 8
R1240 C1240 5
2 7 1
C1243
3 6 4
4 5 2
C1192
3
C1245
R1141
Q1140
Q1261
C1081 R1081
1
VCC2
2
+IN
R1080
3
-IN
R1082 4
OUT
5
GND
C1083
C1082
R1083
R1084
8V
R1023
IC1040
8 1
7 2
R1022
IC1401
13 6 3
14 5 4
12
R1063
R1064 R1062
2 7
1
IC1060
8 3 IC1060
V+ IC1060
V-
4
R1065
NOTICE: Refer to the PARTS LIST for the value and name of each component.
14VA
8V
8V
5V
5V
-5V
-5V
-8V
-8V
R1468
IC1460
6
IC1460
2 7
1 5
3
DRIF
R1466
DTAF
8V
8V
5V
-5V
R1260
W1240
8V
IC1080
10
VCC
9
VCAOUT
8
VC
7
VCAIN
6
NC
C1085
8V
5V
-5V
R1040
CPU - DSP
DRQW DWBY
DRQW DWBY
DCK DDTW
DCK DDTW
DRQR DDTR
DRQR DDTR
DRBY DSTR
DRBY DSTR
6
CTFL NSQL
CTFL NSQL
RTDT
5 TOFF
TOFF RTDT
VSQL DCBY
VSQL DCBY
C1065
DSKY DSST
DSKY DSST
DRES
DRES
-8V