![background image](http://html1.mh-extra.com/html/icom/i703/i703_service-manual_611944073.webp)
BUS LINE1
14V
5V
8V
HV
BUS LINE3
BUS LINE5
VCC
3V
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Y0
Y2
Y
Y3
Y1
INH
VEE
VSS
VDD
X2
X1
X
X0
X3
A
B
IC5601
BU4052BCF
SML
C5604 0.0047
TSWL
C5603 0.0047
REFL
C5602 0.0047
C5610 0.22
R5604
1k
MPXY
R5601
1k
D5601
1SS372
C5605 0.0047
C5606 0.0047
D5602
1SS372
C5609
0.47
R5605
47k
D5603
1SS372
R5602
1k
R5603 1k
C5607 0.1
C5608 0.0047
ALCL
FORL
C7001
1
R7001
4.7k
DOUT
C7002
0.1
R7002
2.2M
R7003
1M
R7004
82k
C7003
0.039
R7005
82k
R7006
82k
C7004
0.1
3
IC7001
NJM2902M
1
2
+
-
C7005
0.0015
C7006
0.1
R7008
120k
R7007
100k
C7007
0.1
R7009
470k
R7010
100k
C7008
100p
5
7
6
+
-
IC700
NJM2902M
C7009
0.0047
R7012
1M
R7013
10k
R7011
2.2M
IC7001
NJM2902M
V+
GND
4
11
C709
0.1
IC2401
NJM2902M
V+
GND
4
11
C2499
0.1
R7102
220k
12
14
13
+
-
IC2401
NJM2902M
BAND
CTCL
BANV
R7151
270k
R7103
220k
C7152
0.01
FDET
NSQL
C7153
0.001
R7152
56k
R7153
47k
R7154
100k
10
IC7001
NJM2902M
8
9
+
-
R7155
4.7k
R7150 150k
C7150 0.01
C7202
1
R7202
1.5k
C7206
10
R7206
470
SPCH
R7201
47k
C7201
0.1
1
2
3
4
5
6
7
8
9
10
VCC2
IN+
IN-
OUT
GND
VCC
VCAOUT
CTL
VCAIN
NC
C7204
10
R7203
47k
C7203
10
R7204
47k
C7151
0.1
AFI
C7205
330p
C7207 10
C7209 10
R7207
10k
R7208
4.7k
AAF
C7208
10
IC7201
M5282FP
R7212 100
C7210
10
R7209 27k
C7211 10
R7211
2.7k
AFGV
C7301
10
R7301
22k
8
7
6
5
1
2
3
4
GND
MUTE
GND
+VS
+INPUT
-
INPUT
SVR
OUTPUT
R7302
1k
C7302
10
CP7301
C7303 10
C7306
1000
IC7301
TDA7233D
C7304
0.1
C7305
470
L7351 BM27-400-6A
Q7351
2SB1132
Q7352
2SC4081
R7351
470
C7351
470
D7351
MA8110
R7371
10k
R7303
4.7
C7307
0.1
R7372
100k
R7376
82k
Q7372
2SK3018
1
2
3
4
5
6
7
8
S
S
S
G
D
D
D
D
C7374
1
SPS
R7374
220k
Q7371
ECH8301
R7373
10k
C7371
1000
L7371
BM27-400-6A
SNDK
Q6601
2SC4081
R6603
15k
R6602
33k
R6601
47k
R6604
4.7k
D6601
MA2S111
1
2
3
4
5
6
7
8
9
10
COMP
VDD
CAP/+2.5V
DGND
MCLK
C9003 47
C9004 0.1
C9005 0.1
IC9001
AD9833BRM
C9001
0.1
SDATA
SCLK
FSYNC
AGND
VOUT
SNDS
R6642
100k
R6641
1k
Q6661
2SC4081
R6663
15k
R6662
33k
R6661
47k
D6661
MA2S111
R6664
4.7k
MAIN
UNIT
(4)
W9005
R9003 1k
R9004 1k
R9005 1k
DST5
PCK5
PDT5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCIN
OSCOUT
REFOUT
FIN
DIN
ENB
CLK
DOUT
FR
FV
LD
VSS
PDOUT
R
V
VDD
IC9101
MC145170D2R2
PDT5
PST5
PCK5
R9102 1k
R9103 1k
R9104 1k
R9101 1M
C9101
0.0047
C9102
100p
L9101
33
µ
C9103 470p
C9104 0.1
C9105 470
C9106 0.1
C9107 0.1
R9106
1k
R9151
1.2k
C9151 10
R9152
100
L9151
1812CS
C9152
0.68
L9201
1812CS
D9201
KV1770S
C9202
10p
C9203
6p
R9001
100
C9204 0.0047
Q9201 2SK508
L9202
E544GN-110248
C9206 0.0047
R9201
330
C9211 0.0047
C9212
0.0047
R9203
10k
C9213
0.1
L9203 1812CS
C9207 470p
C9209
10
R9205
560
C9210
1p
Q9221
2SC4081
R9221
1k
C9221
10
Q9202
2SC4081
R9006
1k
R9054
100
C9052
0.1
R9053
1k
R9051
220k
C9051
0.1
Q9051
2SC4081
C9053
100p
C9054
0.0018
L9051 0.33
µ
L9052
8.2
µ
C9055
82p
C9056 0.0018
L9053 0.33
µ
C9201
470p
L9251
1812CS
D9251
KV1770S
C9252
10p
C9254
0.0047
C9259
10
R9255
330
C9257
470p
C9251
68p
E544GN-110275
Q9251
2SK508
C9260
1p
R9251
330
C9256
0.0047
C9261
0.0047
Q9252
2SC4081
C9262
0.0047
R9253
10k
C9263
0.1
L9253
1812CS
C9301
0.0047
R9302
2.2k
C9302
0.0047
R9303
100
Q9301
2SC4406
R9301
10k
L9301
0.33
µ
C9303
0.0047
C9304
0.1
R9304
100
R9351
470
C9351 47p
W9353
R9354
1k
ESPE
HFS
BUS LINE1
14V
5V
8V
T8L
HV
BUS LINE3
3V
Q9401
DTA114EE
R9401
1k
D9401
MA77
L9401
56n
C9406
12p
L9402
68n
C9402
12p
C9401
27p
C9403
33p
L9403
68n
C9404
4p
C9407
68p
C9408
120p
L9404
0.22
µ
C9405
18p
C9409
68p
R9403
18
R9402
270
R9404
270
1LO
C9681
10
R9681
10k
IC9681
TA78L05F
C9682 10
C9683 0.1
C9684 0.1
C9685 10
O
G
I
1
2
3
4
5
NC
NC
GND
VIN
VOUT
IC9901
S-812C33AMC-C2N-T2
C9901 10
C9902 0.1
C9903 10
C9904 0.1
O
C9923 10
C9924 0.1
C9922 0.1
C9921 47
G
I
IC9921
BA033FP
O
C9941 10
C9942 0.1
C9943 0.1
C9944 10
G
I
IC9941
TA7805F
O
C9961 470
C9962 0.1
C9963 0.1
C9964 470
G
I
IC9961
BA08FP
Q9965
2SK3018
Q9963
DTA114EE
R9962
47k
R9961
1k
Q9966
2SK3018
Q9964
DTA114EE
R9964
47k
R9963
1k
PSS
1
2
3
4
5
6
7
8
S
S
S
G
D
D
D
D
Q9968
ECH8301
R9967
100k
Q9960
2SK3018
Q9967
DTA114EE
R9960
82k
R9968 22
R9969 22
R9970 22
R9971 22
W9022
R9021
1k
C9025
9p
L9022
10
µ
C9024
18p
L9021
10
µ
C9023
9p
R9551
1k
R9552
RV-150
R9553
1k
C9503
0.0047
X9501
CR-745
(16.384MHz)
1
2
3
4
VCON
GND
VCC
OUT
C9501 10
C9502
0.1
C9504
0.0047
C9521
7p
L9521
3.3
µ
L9522
3.9
µ
C9522
2p
C9524
0.75p
C9523
10p
C9525
8p
C9526
0.0047
R9521
470
1
2
3
4
5
IC9521
TC7SU04F
L9523
10
µ
C9527
0.1
C9530
9p
C9529
18p
C9528
9p
L9525
10
µ
L9524
10
µ
W9721 R9721
1k
W9722
1
2
3
4
5
10
9
8
7
6
VDD
COMP
CAP/+2.5V
DGND
MCLK
IC9701
AD9833BRM
SDATA
SCLK
FSYNC
AGND
VOUT
C9703
47
C9704
0.1
C9701
0.1
R9702 100
R9703 1k
R9705 1k
R9704 1k
PDT5
PCK5
BST5
BUS LINE6
C9751
0.1
W9752
C9702
0.0047
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
XIN
CE
CL
DI
LDB
LDA
CA
TEST
PDA2
PDA1
AIA
AOA
OUTA
PIA
VSS
PIB
VDD
CB
OUTB
AOB
AIA
PDB1
PDB2
XOUT
IC9601
LC7153M
SST5
PDT5
PCK5
R9604 1k
R9603 1k
R9605 1k
C9601
0.0047
R9601
4.7k
3
4
2
1
8
7
6
5
IC9691
TC7W04F
R9691
47k
R9607 4.7k
R9606 2.2k
C9604
22
R9608
470k
R9609
270
R9600
1k
FMS
W9751
L9751
220
µ
C9753
0.1
C9756
330p
C9754
330p
R9753
1k
50MS
BFO
C9691
0.1
W9691
Q9600
2SK3018
C9620
22p
C9602
10
C9605
0.0047
C9606
10
C9607
0.0047 W9610
R9611
1k
R9612
47k
L9621
1812CS
C9608
0.0047
D9621
MA357
C9623
56p
L9622
E544GN-110248
FMOD
R9622
47k
R9624
47k
L9624
1812CS
D9622
MA357
C9622
4p
C9624
47p
C9625
6p
Q9621
2SK210
C9626
12p
C9627
12p
R9623 220
L9623
BM27-400-6A
C9632
1p
R9652 2.2k
C9651
0.0047
R9653
100
C9621 1
R9621 2.2k
C9654
27p
R9671
470
W9672
C9673
47p
C9675
47p
L9672
0.12
µ
R9672
270
R9674
270
R9673
18
PWRS
2LO
Q9651
2SC4673
R9651
10k
C9655
22p
L9651
0.15
µ
C9652
0.0047
R9654
100
R9653
0.001
C9629
0.0047
C9630
1
ESPO
SEND
FSK
Q6641
2SK3065
BAND
ULS
L6962
BM27-400-6A
8V
MAIN
UNIT
(6)
T8L
C9002 0.0047
W9021
ULP
Q9681 2SC4081
R9602
47k
L9960
LR-270
R9522
4.7k
HFS
BFO
W9692
W9673
W9674
W9676
C6963
0.001
BUS LINE4
C5601
0.1
R7205
RV-148
SNDK
R7101
10k
AFO
C7308
470
C6766
470
L6701
1M
PSS
MAIN UNIT(5)
3V
8V
14V
P5V
5V
8V
5V
3V
14V
HV
H3V
HV
H3V
14V
L9252
8V
HV
H3V
8V
3V
5V
8V
14V
3V
5V
14V
8V
HV
P5V
5V
14V
8V
3V
3V
8V
14V
5V
C6491
0.0047
R6491
1k
5V
SNDK
_BEEP
14V
5V
T8L
8V
P5V
3V
1
2
3
5V
5V
TPOL
P5V
FSKK
[EUR],[USA],[KOR]only
C9610
22
R5608 1M
ALCL
MPXB
MPXA
MPXX
R5607 100k
R5600 10k
MPXY
C7010
10
R7304 22k
R7104 220k
C9687
0.001
[EUR],[USA],[KOR]only
C9153
0.1
W9251
[EUR],[USA],[KOR]only
[EUR],[USA],[KOR]only
R5606 100k
14V
P5V
W9201
[FRA],[ESP],
[OTH],[ITR]only
P5V
5V
8V
5V
P5V
14V
8V
8V
3V
5V
5V
50MS
HFS
HFS
50MS
5V
14V
8V
8V
14V
5V
FSKK
8V
SEND
SNDS
8V
5V
8V
VCC
SNDK
HV
H3V
RX: 4.9V
50MHz band: 1.6V
OTHER band: 1.9V
HF band: 1.75V
OTHER band: 2.8V
RX:7.7V
RX: 4.6V
50MHz band: 1.2V
OTHER band: 4.9V
RX: 7.9V
RX: 5.0V
15.6nS
0.86V
POWER 9.6V: 9.5V
13.8V: 10.9V
RX: 7.9V
RX: 4.9V
RX: 3.3V
RX: 3.25V
61nS
0.55V
61nS
2.0V
FM MODE: 0V
OTHER MODE: 3.1V
TX:3.1V
RX: 0V
TX: 3.2V
RX: 0V
RX: 4.2V
11 - 6