Main Unit (1) - Icom IC-7400 Service Manual

12-3 MAIN UNIT (1)

MAIN UNIT (1)
C111
0.001
J100
-8V EP101 EP102 -8V
14V 14V
GND 8V
8V
T8V
GND R8V
T8V 5V
GND 14VA
R8V H5V
GND -5V
5V
GND
to RF
ALC ALC
unit J2
AGC AGC
TNV2 TNV2
TNV1 TNV1
RTXS R100 1k TXS
RSKY R103 1k SKYS
DRIV DRIV
RDRS R101 1k DRES
RBST R104 100 BSTB
RMDT R102 100 MDAT
RMCK R105 100 MCK
3LO
MEASUREMENT CONDITIONS
frequency: 14.1MHz USB
RX(RF: no input)
TX(AF: no input)
Digital tester
Range Input resister
200mV 100MΩ
2V 11MΩ
20V 10MΩ Voltage at RX(No designation)
J120
PHV L122 10µ HV SPS R184 1k
P14V PAFO
P14V PAFE
P14V LFMD R183 220
P14V LMFD R182 220
P14V
P14V DRES R181 1k
P14V L120 EXC ELDR25C PWRK R180 1k
P14A SQL
P14A L121 EXC-ELDR25C SEND
PICH L123 10µ ICH MICE
PICL L124 10µ ICL MIC
PGND W120
GND
FVFR L125 10µ VFOR
to PA
PVRF L126 10µ VREF
unit J5
GND
PT8V L127 HF50ACC322513-B
GND L181
P8V L128 HF50ACC322513-B 100µ
P8V
THML EP120 THML
PH5V L129 HF50ACC322513-B
P5V L130 HF50ACC322513-B
P5V
PMCK R120 100 MCK
PMDT R121 100 MDAT
PFSB R122 100 FSTB
PDRS R123 1k DRES
PPWS R124 1k PWRS
Fan rotation
A B C D E
setting
OFF 13.66 13.65 0.70 0.50 0.002
L 12.17 11.51 1.32 7.53 0.723
M 11.97 11.28 3.41 9.66 2.81
H 11.67 10.951 4.98 11.24 4.36
J140
C14V FCNT
C14V L140 HF50ACC322513-B
C14V
GND
CT8V L141 HF50ACC322513-B
GND
C5V L142 HF50ACC322513-B
C5V
GND
C-8V L143 HF50ACC322513-B
to CTRL
GND UNLC
unit J7
GND
CFOR L144 10µ FOR DRES R160 1k
CREF L145 10µ REF PST1
GND PST2
CDRS R140 1k DRES PST3
GND PST4
CANT R141 1k ANTS PST5
GND PDAT
CIST R142 1k ISTA PCK
CIKY R143 1k IKEY CON2
12 - 3
-8V
14V
8V
T8V
R8V
5V
14VA
H5V
-5V
R1424 R1425
680 220
IC1400
L1401 C1400 R1402 M5282FP
10µ 4.7 47k C1407
MIC 1 10
VCC2 VCC 2.2
2 9
+IN VCAOUT
3 8
-IN VC
4 7
OUT VCAIN C1408
5 6
R1401 GND NC 2.2
CP250 100k
C250
J250
from/to 0.1
J400 C1402 C1404
2IF
RF unit 470p 2.2
J261
3LO MICE
5.5mV
from RF
R1283 150k
unit J1601
0.7mV
C1283 0.001 R1285
5.6k
R1280 C1280
IC1300
3.9k 0.1 2 IC1280
NJM4558M NJM2058M
VOXL 1 - NJM4558M
3
+
4.9mV 8
R1282 220k 2.0mV
J1001 V+
8.8mV V-
C1282 100p
4 11
GND C1285 R1286 R1288
R1281 C1281
DRIF DRIF 0.1 100k 22k
6.8k 10 6
GND AVXL 7 -
5
J180 GND +
IC1280
FSPS DTAF
NJM4558M
PAFO GND
4.62V
PAFE GND
FLFM GND DTAF
FLMF 8V 8V
GND 8V 5V
FDRS GND -5V
to DSP
unit J901
FPWK GND BEEP
SQL DAGC DAGC
SEND MONI MONI
MICE GND
to S-LOGIC
MIC GND C1180 R1180
board J601 0.47 15k
IC1160
GND GND
TC4W53F
-8V DRAF DRAF
GND GND 5 4 C1181 R1181 R1185
0.47 2.2k 47k
GND GND
5VL DTIF DTIF 6 3
C1183 R1182
5VL GND
W1120 0.47 1k
GND 7 2
R1184
8V R804
1k
22 C1182 R1183
GND 8 1
0.47 1k
14V
C1161
R802 C803 R801
10
10k 0.001 22
A
B
Q801 SQLS
2SB1201 8V
J802 FCNT 5V
Q802
CP801 D
2SC4116 C
MF+
CP802
to CHASSIS GND
D801
MF1 GND
MA8068
GND
E C1002
R1007
CP803 0.1 470k
R1000
2.49V
680k C1006
2.52V 100p
R1005 R1006
R1002 R1003 R1004
2 120k 82k
J1000 82k 82k 82k - 1
3
+
C1004 2.46V
R1008
GND IC1001 10
NJM2904M 2.2M
J160 2.38V
FCNT GND
14V GND
14V DRQW DRQW
GND DWBY DWBY
8V DCK DCK
8V DDTW DDTW
GND GND
5V GND 8V
5V DRQR DRQR 5V
GND DDTR DDTR -5V
GND DRBY DRBY
to RF
UNLC DSTR DSTR
unit J1001
GND GND
LDRS GND R1102 C1102 C1104
to DSP 27k 0.0015 0.0027
PST1 unit J902 CTFL CTFL 3.9mV
PST2 NSQL NSQL
PST3 TOFF TOFF
R1100 R1106 R1107
PST4 RTDT RTDT R1103 R1104 R1105
10k 6 1k 1k
PST5 VSQL VSQL DTIF 9 1k 1k 1k - 7
- 8 5
PDAT DCBY DCBY 10 +
4.9mV + -1.9V IC1120
PCK IC1120 µPC4574G2
IC1120 -2.8mV
CON2 -3.8mV µPC4574G2 -2.6mV
µPC4574G2
GND
GND
DSKY DSKY IC1120
DSST DSST µPC4574G2
DRES DRES 13
- 14
GND 12
+
-8V
-8V
14V
8V
T8V
R8V
5V
14VA
H5V
-5V
CP9001
7.6V 13.6V TX: 7.96V TX: 0.2V 7.8V 4.9V 13.63V -7.64V
RX: 0V RX: 8V
4 8
C1416 5mV
2.8mV V+ V+
C1413 0.0047
R1411
2.8mV -2.2mV 0.0027 V- V-
220k
IC1401 11 IC1401 4 IC1460
IC1401
C1417 NJM2058M NJM2058M BA15532F
C1412 NJM2058M
R1407 R1417 0.0012
R1412 R1414 R1415 470p 9
10k 6 22k - 8 -39.6mV
2 6.8k 22k 22k - 7 10
- 1 5 + -39.7mV
3 +
+ R1418 R1470 100k C1464 0.0068
IC1401 R1416
R1408 22k
NJM2058M 22k IC1460
10k 3.9mV
C1465 BA15532F
2.1mV 3.5mV
C1470 R1462 R1464 680p
2
0.1 1.5k 1.5k - 1
3
IC1310
+
BU4053BCFV
R1465
1 16
Y1 VDD 1.5k
2 15
Y0 Y -39.7mV
3 14
Z1 X
4 13
Z X1
5 12 RIF
Z0 X0
6 11
INH A 4.35V
7 10
VEE B R1307 D1300 R1309 100k C1309
8 9 IC1300
VSS C 680k 1SS385 220p
4 C1304 R1305 2 R1308 NJM2058M C1308 R1312 9
2.12V
0.47 100k - 1 100k 0.1 100k
V+ 3 6 10
+ - 7
GND 5
IC1300 + R1313
NJM2058M 100k
4.26V 4.34V
3.1V 12mV
13
6.73V 12
8V
5V
-5V
12.93V
R1187 1.133V
CP1244
4.7k
CP1245 12.95V
IC1220
CP1241
C1188 TC4W53F R1240
IC1180
10 10k 5 C1243
M5282FP 1 8 1 470
4
1 10 2
VCC2 VCC C1240
2 9 2 7 IC1240
+IN VCAOUT 10 3
LA4425A
3 8
-IN VC R1192
4 7 3 6
OUT VCAIN 1 CP1242
5 6 3.3mV
R1186 GND NC
10k 4 5
CP1243
C1185 C1189
0.0022 1
8V
TX: 0.329V
R556
100k
R561 R551
IC1001 IC1080
C1081 R1081 NTCCM20123SH 68k
NJM2904M 8 M5282FP
0.47 47k
V+ 1 10
VCC2 VCC
R1088 R562
GND 2 9 TX: 0.328V
+IN VCAOUT 2.2k NTCCM20123SH
4 Q1140 3 8
-IN VC
2SK1829 4 7 TX: 5.91V
OUT VCAIN
6 5 6
- 7 Q1261 R1082 GND NC
5
+ 2.51V DTC114EU 100k
IC1001 AM: 0V
other: 4.98V
NJM2904M
C1083 R1084 C1085
R1083 C1082
470p 47k 10 R555
100k 0.1
SPCH RV-150
0V
PRE off,34dBµ
(AGC on)
2.96V R1023
100k
IC1040
17.8mV R1040 TC4W53F
IC1401 1k
R1022 NJM2058M 1
-1.6mV 100k
2 13
- 1 - 14
3 4 8 12 17.4mv 2
+ +
C1065
IC1120 V+ IC1060 V+ 6
µPC4574G2 7 - 10
V- NJM4558M V- 1.625V 5 3
+
11 4
IC1060
4
NJM4558M
PRE off,34dBµ
(AGC on) IC1060
2.97V NJM4558M
C1021 2.5mV
0.001 2
1 -
3
+
-8V
0.2V
-8V
14V
8V
T8V
-7.64V
4.99V
R8V
7.79V
5V
14VA
H5V
L201
L202
13.63V 7.96V LS-450 0V 7.55V LS-450 0V 6.6V
L203
Q202
LS-450
0V 2SK882
Q200 1.282V Q201 1.282V
2SK882 2SK882
0V
R1468
2.2k
L200
1m
IC1460
BA15532F
-90.1mV
6
- 7
5
+
7.85V FI271 FI272
C264
CFWM455D CFWM455D
0.0047
1 2 1
L251 L252 L253
2.68V
LS-468 LS-468 LS-468
D250 D252
Q250
1SV308 1SV308 R258 L254
RIF 2IF 3SK131
C253 47 LS-468
0.0047
D251
1SV308
12mV D253 C259
1SV308 0.0047
- 8 0V
0.825V
+
IC1300
NJM2058M
AGC
- 14
R8V
+ CP9007
IC1300 8V
NJM2058M
RIF
Q330
L330 R337 D380
2SK882
LS-469 NTCCM20123NH MA77
R336 C334 D381 R383
0.0047
100k MA77 220
TX: 7.04V
R330
1k
Q1260 TX: 17.5mV
2SD1801
T8V
ALC
FI381
CFWM455D
TX: 1.2mV
R1260 R366
13.61V R363 R370
47 220 1
100k 330k
TX: 51.6mV TX: -54mV
C302
0.0047 D362
R364
6 MA2S111
10k - 7
R302 5
+ IC360
8.2M
NJM4558M
TX: 0.809V
R300 TX: 1.2mV
TX: -6.31V
W1240 3.3M W361
2
- 1
3
IC300 IC360
+ D363 NJM2058M NJM4558
R365
IC300 2 MA2S111
10k - 1 4 8
NJM2058M 3
+ V+ V+
R559 TX: 3.88V IC360
V- V-
2.2M TX: 52.9mV NJM4558M
D360 TX: 0.196V 11 4
1SS385
IC300
NJM2058M
D552
9
MA2S111
- 8
10
+
R560 TIF
1M
8V
-8V
D553
13 MA2S111 14V
- 14
12 R8V
+
5V
IC300 TX: 3.97V
T8V
NJM2058M
ALC
TX: 5.96V
0.1V
Q303
2SA1576
D312
D310 D311 DAN222 Q305
R313 R316
MA8039 MA8039 0V DTC144TE IC502
100k 1.5M
M62352GP
C304
11
0.001
12
0.847V
13
R318 D305 14
R310 R314 6 330 MA2S111 15
22k 220k - 7
5 16
+
17
IC300
8 C305 18
1.143V NJM2058M 7.39V
10
19
7 20
6
Q300 Q301 Q302 Q304 Q306
Q308 144M
5 DTC114EU DTC114EU DTC114EU DTC114EU DTC114EU RX: 2.4V
2SA1576
FMS
R524
47k
HF: 0V 50M: 0V 144M: 0V AM: 0V
Q309 other: 0.377V other: 0.302V other: 0.38V other: 0.381V
DTC144TE
BUS LINE1
-8V
14V
8V
5V
H5V
7.0V 7.6V 0V
C211
0.0022
3.7V 7.6V
7.6V Q207 8.7V
C209 R211
UN911H
0.0047 22k R217 2.2M
D200
1SS375
1.4V Q206
2SC4081
Q203 0V Q205 7.8V
2SC4081 2SA1576
0V
3.1V Q204
2SC4081
L281
100µ
W270
noise blanker
2
IC280 off: 7.79V
TC4W53F on: 0.775V
setting level Q208
1 8 100%: 6.9mV
XP4311
0%: 1.54V
2 7 IC281 IC282 6
7 -
TC4SU69F TC4SU69F
5 3 4
+
3 6 5 1 5 1
IC200 2 5
2 2
NJM2058M
4 5 4 3 4 3 1 6
7.8V
NBS
NBV
8V
CP9008
RIF 3LO
R385
100
IC400
R384 D382 NJM1496V
10k MA77
1 14
+SI VEE
R407 220 2 13
D383 C400 GAIN NC
3 12
MA77 0.0047 W400 GAIN -OUT
4 11 C406 R413 MAIN
-SI NC 0.0047 100
5 10 UNIT
BIAS -CI
6 9
+OUT NC
7 8 (2)
NC +CI Band α β γ
2 1.9 3.67 3.69 7.40
3.5 3.00 3.01 6.05
R390 7 2.51 2.52 5.00
100 R409 10 0.01 0.01 0.01
3.9k 14 2.01 2.02 4.06
18 1.58 1.589 3.18
R388 21 1.58 1.589 3.18
220
W380 24 1.10 1.119 2.22
28 1.10 1.119 2.22
50 0.935 0.940 1.88
144 0.932 0.936 1.87
Q381
7.8V
XP4311
IC200
NJM2058M β R502
4 3
100k
4
2.1mV α
5 2 V+
R503
R322 R500
GND 2 470
10k 47k - 1 BAND
6 1 11 Q307 3
+
2SA1576
IC200
NJM2058M γ
TIF
0.12V
8V 8V
-8V
CP9017
14V
R8V
CP9013 CP9015
5V
T8V
CP9012
ALC
TX: 4.77V TX: 0.195V
2.7V
RX: 31mV RX: 0.64V
Q452 R450 R780
1.43V 2SD1619 4.7 4.7k
R511
1k
Q780
0.8V 0.08V
D450 D720 2SC4081 R781 R783
Q511 DA221 R451 DAN222 33k 4.7k
10
VCC VDD 2SC4081 1k
9
AO11 AO10
D721 D781
8 0.65V
AO12 AO9 R452 DAN222 MA2S111
7 144M
DO AO8 10k
6 TX: 0.195V
LD AO7 RX: 0.64V
5 Q721
CLK AO6 R720 R726
4 Q450 R724 2SC4081
DI AO5 33k 4.7k
3 2SC4081 4.7k
AO1 AO4 144M
2
AO2 AO3 TX: 4.56V
1 Q453 R453 D722
GND VSS 2SD1619 4.7 RX: 29mV MA2S111
144M
RX: 4.78V
144M
RX: 5.44V D451 13.2V
Q722
DA221 8.6V R454 R722 R727 R725
R526 100k 144M R523 100k 2SC4081
RX: 2.72V 1k HF+50M 33k 4.7k 4.7k
TX: 4.76V
R521
13 9 HF+50M RX: 30mV
- 14 47k - 8 0V R455
12 10 TX: 7mV Q720
+ + 4.7k RX: 7.56V D723
DTC114EU
HF+50M MA2S111
IC200 IC200
NJM2058M NJM2058M TX: 0.195
Q451 RX: 0.64V
2SC4081
144M 144M
RX: 2.39V RX: 2.71V
BUS LINE2
MAIN UNIT (1)
14V
8V
5V
H5V