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Icom Manuals
Transceiver
IC-703
Service manual
Main Unit - Icom IC-703 Service Manual
Hf/ 50mhz all mode transceiver
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Also See for IC-703
:
Instruction manual
(112 pages)
,
Installing manual
(5 pages)
,
Instruction manual
(9 pages)
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Table Of Contents
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11-2 MAIN UNIT
MAIN UNIT(1)
J5101
LRXD
EP5001
LRXD
14V
5V
LTXD
EP5002
LTXD
T8L
MIC
EP5003
MIC
W1
T8V
to JACK
8V
8V
board J1
MICE
MICE
L5004
AFO
AFO
LR-270
PWRK
PWRK
L5006
BM27-400-6A
C7
0.1
J1
W3
W5
RX
from PA
unit J300
T8L
14V
Q101
XP4311
5V
4
5
6
J2
PAI
from PA
unit J100
D301
MA77
R206
220k
D302
MA77
Q414
2SK3018
14V
IP14
Q410
DTA114EE
J2451
AFI
e
AFIE
to optional
unit
UT-106
Q401
2SC4081
P2451
J2452
AFI
f
AFIE
to optional
unit
W109 W110
UT-106
J2453
GND
Q408
GND
2SC4081
GND
[EUR],[USA],[KOR]only
DSPS
g
to optional
5V
h
unit
MCK
i
UT-106
MDT
j
DSTB
k
DINT
l
DRES
DSRS
R2459
1k
R411
T8L
1k
R1
D3
L3
R11
100
100
MA77
47
ATT OFF: 0V
ON: 13.0V
R2
C8
330
0.1
D1
MA77
Q2
DTA114EE
D2
R3
Q1
MA77
56
DTA114EE
R5
R9
220
1k
ATOF
Q3
Q4
2SK3018
2SK3018
ATT OFF: 13.0V
ON: 0.1V
D101
MA77
TX: 4.4V
Q102
R104
RX: 0V
L104
R106
XP4311
10
100
180
3
4
3
2
5
2
1
6
1
R102
C103
C104
6
18
0.1
0.1
W106
W108
4
1
IC101
5 3 2
PC2709T
C201
R203
C202
L203
L204
0.1
82
0.1
4.7
6.8
C205
D303
270p
MA77
B0H
C301
C303
0.0027
W311
0.0015
D305
L304
L305
MA77
0.27
0.33
R306
R305
C307
C309
220k
220k
27p
10p
Q402
Q403
Q404
Q405
Q406
Q407
2SC4081
2SC4081
2SC4081
2SC4081
2SC4081
2SC4081
IC401
IC401
TC74HC02AF
TC74HC02AF
3V
2
8
1
10
3
9
14
V+
IC401
TC74HC02AF
GND
Q409
IC401
IC401
7
2SC4081
TC74HC02AF
TC74HC02AF
5
11
4
13
6
12
Q411
Q412
R624
Q413
R623
DTA114EE
DTA114EE
220
DTA114EE
220
R412
R413
1k
1k
PROS
Q415
Q416
Q417
2SK3018
2SK3018
2SK3018
14V
5V
T8L
T8V
8V
ATON
D501
C502
C504
Q501
L505
R503
L506
IP14
MA77
100p
15p
2SK1740
2.2
1
LR-317
R504
Q502
47
DTA114EE
B7RH
14V
D521
L522
L523
C527
C529
C531
D522
MA77
68n
82n
120p
47p
82p
MA77
C523
C525
82p
24p
R523
220k
B7TH
[EUR],[USA],[KOR]only
C541
D542
0.1
MA77
D541
R541
L541
L542
R542
MA77
100
220
220
270
R543
220k
BTHH
D551
C552
C554
C556
D552
MA77
0.0047
0.0015
0.0047
MA77
R551
L551
L554
R552
100
100
100
270
R553
220k
B2H
D561
C562
C564
C566
D562
MA77
0.0027
680p
0.0012
MA77
R561
L561
L564
R562
100
100
100
270
R563
220k
B3H
D571
C572
C574
C576
D572
MA77
0.001
330p
560p
MA77
R571
L571
L574
R572
100
100
100
270
R573
220k
B4H
D581
C582
C584
C586
D582
MA77
330p
150p
270p
MA77
R581
L581
L584
R582
100
100
100
270
R583
220k
B5H
D591
C592
C594
C596
D592
MA77
470p
120p
220p
MA77
R591
L591
L594
R592
100
100
100
270
R593
220k
B6H
3V
EP101
[EUR],[USA],[KOR]only
C513
82p
TX: 6.1V
TX: 6.9V
RX: 0V
RX: 13.1V
L507
C511
D502
D601
C602
D602
0.12
0.0047
MA77
MA77
0.1
MA77
R602
C509
15p
220k
14V
PRE OFF: 0V
PRE OFF: 5.9V
C656
ON: 5.8V
ON: 0V
0.1
R622
L654
220k
100
L652 LR-435
D621
D622
L650
C651
MA77
MA77
0.12
0.1
C622
D631
R632
C633
D632
0.1
MA77
56
0.1
MA77
C632
0.1
R635
220k
PRE OFF: 4.1V
PRE OFF: 5.9V
ON: 0V
ON: 13.2V
Q1301
Q1302
Q1303
DTA114EE
DTA114EE
DTA114EE
R1311
R1312
1k
1k
Q1305
Q1306
Q1307
2SK3018
2SK3018
2SK3018
TX: 0V
RX: 0.45V
TX: 2.9V
L1101
RX: 1.6V
LS-450
C1106
0.0047
Q1101
3SK294
8V
3V
Q1852
Q1851
DTA114EE
DTA114EE
R1851
6.8k
R1858
R1856
1k
1k
Q1855
Q1854
2SK3018
2SK3018
Q1201
2SK882
Q1853
2SK3018
11 - 2
BUS LINE1
14V
5V
T8L
T8V
8V
a
L681
L682
L683
0.15
0.15
0.1
Q701
C682
C684
C686
DTA114EE
10p
15p
39p
IPS
Q702
2SK3018
R703
D623
1k
MA77
1LO
R654
220k
14V
L655
100
L653
100
b
c
Q651
C751
2SC4536
0.001
d
R655
R653
22
4.7k
R1013
220
8V
MAIN
UNIT
Q1304
(2)
DTA114EE
R1313
R1314
1k
1k
Q1308
2SK3018
e
R8V
BUS LINE2
L1102
D1301
LS-450
MA77
f
R1108
10k
Q1102
DTC114EE
b
8V
C1202
R1252
0.0047
100k
L1201
LS-450
Q1251
2SC4081
g
h
3V
BUS LINE3
Table of
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