![background image](http://html1.mh-extra.com/html/icom/i703/i703_service-manual_611944070.webp)
BUS LINE1
BUS LINE3
3V
14V
5V
8V
T8L
T8V
MAIN
UNIT
(1)
a
L701
LR-317
EP801
R801
1k
L801
0.27
µ
C801
0.001
C802
18p
D701
HSB88WS
C704
5p
3
1
2
5
4
6
Q652
XP4311
P5V
Q753
2SK3018
Q752
DTA114EE
R759
47k
R758
1k
SLOS
b
c
d
Q751
2SC4673
R754
4.7
C752
0.001
L752
0.47
µ
C759
470p
L753
68n
C757
5p
C756
27p
C758
27p
C753
0.0047
C754
0.1
R755
15
R757
220
R771
270
R773
270
R772
18
L702
LR-358
R802
47
C811
0.0047
R811
1k
D801
MA77
R702
1k
C705
0.0047
C803
56p
L802
0.15
µ
C800
7p
C812
82p
L811
0.27
µ
R812
47
C816
0.0047
Q811
2SK508
L812
0.5
µ
C813
10p
D803
MA77
D804
MA77
R851
1k
C851
0.0047
L851
LR-414
C814
0.0047
C815
0.001
R813
100
C810
0.001
EP812
C850
3p
IN
GND
GND
OUT
L852
LR-414
C853
8p
1
3
5
6
4
2
C852
0.0047
R852
1k
D861
MA77
D862
MA77
C861
0.1
R862
18
R861
270
R863
270
D863
MA77
D864
MA77
R901
1k
C901
0.0047
L901
LR-317
D901
HSB88WS
C903
470p
2LO
L902
LR-395
C904
100p
C755
0.0047
L831
LS-484B
R831
1k
C831
0.0047
C840
0.001
EP831
C839
0.001
C832
0.0047
R832
100
C833
15p
R833
RV-150
Q831
3SK294
C834
0.0047
R839
560
R834
NTCG16
C835
0.0047
R840
220
R841
NTCG16
R836 1.8k
C836
15p
C837
0.0047
L832
LS-484B
C838
0.1
R838 1k
R837
8.2k
R881 1k
C881
0.001
L881
LS-484B
C882
0.0047
R882
5.6k
C883
15p
R883
1.8k
Q881
3SK294
C884
0.1
R884
1M
C885
0.0047
R885
150
C889
0.001
R886
4.7k
C886
15p
R887
100
C887
0.0047
L882
LS-484B
R888
1k
C888
0.0047
BUS LINE1
BUS LINE3
R902
47
C830
0.001
EP901
R1000
1k
R1001
47k
Q1001
DTA114EE
Q1006
2SK3018
NBS
L1001
100
µ
R1002
10k
Q1002
2SC4081
R1003
6.8k
Q1003
2SC4081
C1002
47
R1004
100
R1007
1.2k
D1001
MA2S111
R1005
47k
Q1004
2SA1576
C1003
1
R1008
330
R1009
2.2M
Q1005
2SC4081
R1011
47k
D1002
RB876W
R1012
100k
C1004
470p
C1005
0.0022
C1051
0.1
R1051
3.3k
C1052
56p
L1051
2.2M
R1052
100
C1053
0.1
R1053
470
Q1051
2SK882
R1054
22k
L1052
LS-450
R1055
100
C1055
0.1
R1056
470
C1056
0.1
Q1052
2SK882
R1057
22k
L1053
LS-450
C1058
0.1
R1059
470
R1058
100
C1059
0.1
Q1053
2SK882
R1060
47k
R8V
D1303
MA77
R1321
10k
BUS LINE2
2F23
R1322
47k
C1321
0.1
O
I
FI1301
FL-65
R1323
100
C1322
0.1
R1324
10k
D1311
MA77
R1006
680
NBLV
C1341
0.1
D1305
MA77
R1341
10k
FI1341
CFWS455G
C1342
0.1
2F80
R1342
47k
R1343
100
I
O
R1344
10k
D1313
MA77
C1361
0.1
D1307
MA77
R1361
3.3k
C1362
0.1
2FOP
R1362
47k
R1363
100
R1364
3.3k
D1315
MA77
D1309
MA77
D1317
MA77
R1301
10k
C1381
0.1
R1381
10k
C1382
0.1
2FTH
R1382
47k
R1383
100
R1384
10k
C1383
0.1
R1385
1k
R1306
10k
C1303
0.0047
R1401
10k
D1401
MA77
D1402
MA77
R1403
10k
C1412
1
R1402
5.6k
C1403
0.1
L1401
2.2M
C1401
0.0047
Q1401
3SK294
Q1402
DTC114EE
R1405
150
C1404
0.1
C1006
0.0047
C1405
0.0047
R1406
1k
1
2
3
4
5
6
7
8
IC1401
TC4W53F
C1410
0.0047
C1411 0.1
C1406 0.1
R1407
470k
R1408 470k
14V
5V
8V
T8L
T8V
R8L
C1416
0.001
R835
150
R1416
82k
R1410
10k
C1407
0.0047
C1408
0.0047
R1409
39k
R8V
R1419
10k
C1415
0.1
R1418 470
R1411
10k
R1412
10k
D1403
MA77
D1404
MA77
C1402
0.0047
Q1404
2SK3018
Q1403
DTA114EU
R1422
10k
W1421
R1417
4.7k
C1413
1
R1413
10k
C1409
0.0047
FI1501
CFWS455E
O
I
L1501
LS-468
3V
IC2461
TC4W53F
1
2
3
4
5
6
7
8
AFI
SQL
R2458
10k
f
R2462
1k
Q2462
2SK3018
R2461
1k
R2460
10k
Q2461
2SB1132
R2456
1k
g
h
R1415 47k
o
DSPS
C2452
0.1
c
C2501
150p
D2501
RB876W
C2502
100p
R2501
22k
Q2501
2SC4081
R2502
1k
R2503
470k
R2509
68k
R2508
15k
D2502
MA2S111
R2507
10k
RFGV
R2512
47k
R2511
1k
Q2502
DTA114EE
Q2504
2SK3018
C2504
3.3
R2505
100
R2504
100
Q2505
2SK3018
R2514
47k
R2513
1k
Q2503
DTA114EE
C2503
0.0047
AGFS
AFMS
-
+
6
7
5
IC2401
NJM2902M
C2551 0.0047
R2559 3.3M
R2555
1k
R2554
100k
R2551
2.2M
SML
p
C2505
10
R2506
1k
DRIV
MAIN
UNIT
(3)
e
f
g
h
C842
33p
W830
W831
FI851
FL-348
W901
R1010
47k
L1402
100
µ
R1420
47k
R1501
100k
R2553
390k
MAIN UNIT(2)
8V
R8L
C2451
0.1
8V
5V
14V
T8L
T8V
8V
R8L
R8V
8V
5V
T8V
5V
8V
8V
5V
T8V
3V
R8L
T8V
D802
1SV271
R889
3.3k
R1014
1k
D1408 MA2S111
R1400
5.6k
8V
8V
8V
T8V
T8L
R8L
R842
1k
R843
1K
R844
NTCG16
C844
0.001
T8L
T8L
T8L
R8L
ALCL
R8L
T8L
R8L
ALCL
R8L
8V
5V
T8V
R8V
R8L
5V
8V
T8V
R8V
R8V
R8V
5V
R8V
8V
5V
ALCL
T8V
8V
8V
TX: 0V
RX: 0.45V
TX: 1.5V
RX: 1.6V
TX: 1.6V
RX: 1.6V
TX: 0.3V
RX: 0.35V
TX: 0V
RX: 1.6V
TX: 0V
RX: 0.55V
TX: 1.5V
RX: 2.7V
TX: 0V
RX: 7.9V
TX: 7.9V
RX: 0V
SQL CLOSE: 3.2V
OPEN: 0V
NB OFF: 0V
ON: 7.7V
TX: 0.25V
RX: 0V
11 - 3