Icom IC-703 Service Manual page 71

MAIN UNIT(3)
BUS LINE1
14V
5V
T8L
T8V
8V
R8L
IC1601
M5282FP
1 10
VCC2 VCC
2 9
IN+ VCAOUT
3 8
IN- CTL C1609 R1609
4 7
0.1 6.8k
OUT VCAIN
5 6
GND NC
IC1602
R1611
TC4W53F
47k
5 4
6 3
7 2
8 1
8V
5V
T8V
Q1802
R1809 L1803
DTA114EE
2.2k 100
R1820
100
MAIN
Q1801
R1819 C1808 R1810
DTC114EE
UNIT
680 0.1 10k
(2)
c
R8V
8V 8V
5V 5V
R8V
R1623 R1646
100k 150k
IC1621 IC1621
NJM2902M NJM2902M
R1621
2 6
10k - 1 - 7
3 5
+ +
R1647
100k
8V
R2607 150k
R1683 C1682
2.2k 470p
R2604
100k
R1686 100k
13
-
14
12
+
IC1621
NJM2902M
R1666
100k C1662 100p
R2613
R1663 470k 82k
R1661
9
10k - 8 IC2201
C2607
10
NJM2058M
+
0.0022
2
-
IC1621 3
+
NJM2902M
R2614
82k
R1602 R1601
220 1k
W1601
R2623
1k
3V
BUS LINE3
C1721
R1701 470k
1
R1702 470k
R1703 470k
R1704 470k
R1705 470k
IC1701
BU4052BCF
Q1701
DTC114EE
8V
5V
IC1901
C1905 R1902
TA4101F
0.1 100
5 4
BASE BASE
6 3
BASE OSCIN
C1902
7 2
100p GND VCC
8 1
COLECT IFOUT
R2206 R2207
220k 1k
R1641 R1643
10k 10k
IC2201
NJM2058M
R1648
9
-
100k 8
10
+
4
V+
GND
11
IC1621
NJM2902M
OTHER MODE: 0V
D1641 D1642
FM MODE: 3.1V
DA221 DA221
IC2651
R2608
TC4W53F
6 150k
- 7 5 4
5
C2652
+
1
6 3
IC2201
NJM2058M
7 2 RXS
8 1 FMOD
R2609 C2605
220k 0.1
R2704
56k
R2615 R2620
1.2k 22k
1
Q2701 Q2702
Q2601 DTC114EE DTC114EE
2SK3018
14V
5V
T8L
T8V
8V
R8L
C1801
2.2
IC1751
TC4W53F
R1721 C1723
5 4
100k 1
6 3
R1751
2.2k
7 2
Q1721
2SC4081 8 1
Q1803
2SK3018
8V
5V
BFO
Q2101
DTA114EE
R2001 R2005 C2005 R2105
1k 1k 3.3 1k
Q2102 R2101
2SK3018 150k
8V
5V 5V
R2303 15k
R2304 47k
R2305 470k
R2306 27k
IC2201
NJM2058M 4
R2221
13 V+
100k - 14
12 GND
+
11
IC2301
BU4052BCF
IC2201
NJM2058M
FMS
8V
Q2705
2SK3018
R2729
100k
CP2711
R2710 C2701 D2704
100k 22p MA2S111
R2711 R2712
1M 2.2M
R2713
2 330
-
1
3
+
R2708
Q2704
IC2701
220k
NJM2902M 2SK3018
R2714
Q2703
470
2SK3018
R2723 R2725
1k 1k
3V
IC1801
R1805 C1802 L1801
TA4107F
100 0.1 100
1 8
LO1 LO2
2 7
R1811 VCC GND
R1818
3 6
RV-156
470 RF2 IF2
4 5
RF1 IF1
R1803
EVM-3Y
D1802
1SS372
R1808
2.2k
8V
BFO
Q2104
IC2101
R2107 2SK3018
TA31136FN
3.3k
1 16
OSCIN MIXIN
2 15
OSCOUT VSS
Q2103
3 14
MIXOUT NOUT DTA114EU
4 13
VDD NDET
C2102 C2110
5 12
0.1 IFIN SOUT 100p
6 11
IC2401
BIAS IFOUT
C2152 R2152
7 10 NJM2902M
FILOUT QUADIN 0.01 39k
8 9 R2151 10k 9
FILIN AFOUT - 8
10
+
R7305 100k
R2153
0.01
R2103 C2107 C2109
330k 0.01 0.1
FMS
k
R2453
1k
DSTB
C2401
l
0.0047
R2452
1k
C2403
DINT
R2401 R2402
2 10
-
10k 10k 1 o j
3
+
e
IC2401
R2454
NJM2902M
1k
MDT
i
R2455
1k
MCK
8V
8V
IC2701
NJM2902M
R2781
2.2M
R2744
1M
R2783
6
- 7 10k
5
+
R2745
IC2701
470
NJM2902M
R2767 R2762
47k 2.2M
R2786
1k
R2768
9
-
47k 8 D2781
10 Q2781
MA8036
+
2SA1576
R2761
IC2701
470
NJM2902M
R2765
RV-150
11 - 4
BUS LINE1
14V
5V
T8L
T8V
8V
R8L
MAIN
UNIT
(4)
Q2451
2SK3018
Q2452
2SK3018
Q2454
2SK3018
Q2455
2SK3018
4
V+
GND
11
W2785
13
- 14 ALCL
12
+
R2789
IC2701
470
NJM2902M
p
D2782
DAP222
EALC
3V
BUS LINE3