Icom IC-703 Service Manual page 73

MAIN UNIT(5)
BUS LINE1
14V
5V
T8L
8V
P5V
3V
IC9001
AD9833BRM
1 10
COMP VOUT
C9002 0.0047 2 9
VDD AGND
3 8 R9003
CAP/+2.5V FSYNC
4 7 R9004
DGND SCLK
5 6 R9005
MCLK SDATA
W9005
[EUR],[USA],[KOR]only
RX: 4.9V
R9054 C9052
100 0.1
L9251
1812CS
C9053 L9052 C9055
100p 8.2 82p
D9251
KV1770S
Q9051
2SC4081
BFO
MAIN 5V
UNIT
L9521
X9501
(4) 3.3
CR-745
(16.384MHz)
C9504 C9522
1 4
VCON VCC 0.0047 2p
2 3
GND OUT
0.55V
R9702 100
P5V
61nS
L9022 L9021 L9525 L9524
10 10 10 10
W9721 R9721 W9722
1k
5V
14V
8V
3V
IC5601
R5601
BU4052BCF
1k
REFL 1
Y0
TSWL 2
Y2
3
Y
SML 4
Y3
5
Y1
R5604
6
1k INH
MPXY 7
VEE
8
VSS
C7150 0.01
R7152
56k R7150 150k
C7151 R7151 R7153
0.1 270k 47k
9
5V 10
R7154
IC7001
100k
C6491 NJM2902M
0.0047
HV
VCC
SNDK
BUS LINE4
BUS LINE5
BUS LINE3
IC9101
MC145170D2R2
R9151
1 16
OSCIN VDD 1.2k
R9101 1M 2 15
OSCOUT V
1k DST5 3 14
REFOUT R
1k PCK5 4 13
FIN PDOUT
R9106
1k PDT5 PDT5 R9102 1k 5 12
DIN VSS 1k
PST5 R9103 1k 6 11
ENB LD
PCK5 R9104 1k 7 10
CLK FV
8 9
DOUT FR
L9252
E544GN-110275
R9255
C9254
W9251
330
0.0047
C9251 C9260
68p 1p
R9251 C9301
Q9251
330 0.0047 C9351 47p
2SK508
Q9252
2SC4081 R9253 Q9301
10k 2SC4406
50MHz band: 1.6V
OTHER band: 1.9V
5V
L9522 C9526 R9521
C9601 R9601
3.9 0.0047 470
0.0047 4.7k
IC9521
C9524 C9756 C9691
TC7SU04F
0.75p 330p 0.1 W9691
1 5
2
C9754
3 4 IC9691
330p
TC7W04F
1 8
2 7
IC9701
R9753
C9751
AD9833BRM 1k
0.1 W9752
1 10 3 6
COMP VOUT
2 9
VDD AGND
3 8 R9703 1k BST5 4 5
CAP/+2.5V FSYNC
4 7 R9704 1k PCK5
DGND SCLK
5 6 R9705 1k PDT5
MCLK SDATA
2.0V [EUR],[USA],[KOR]only
5V
61nS
14V
8V
C7002 R7004 R7005
R5602
0.1 82k 82k
1k
16 FORL
VDD
15 TPOL
X2
14 R5600 10k ALCL
X1
13 R5603 1k
X
12
X0
11
X3
10 ALCL
A
9 5V
B
14V
8V
C7204
10
C7203 R7203
10 47k
AFI
C7202 R7202 R7205
1 1.5k RV-148
R7204
47k
- 8
+
14V
5V
T8L
8V
HF band: 1.75V RX:7.7V
OTHER band: 2.8V
P5V
3V
R9205
L9203 1812CS RX: 4.6V
560
L9202
Q9221
E544GN-110248
2SC4081
C9204 0.0047
L9151 L9201 C9201
1812CS 1812CS 470p Q9201 2SK508
C9221
R9221
10
1k
R9201
330
R9203
D9201
10k
KV1770S
Q9202
2SC4081
[EUR],[USA],[KOR]only
HFS
R9304
50MS
100
H3V
HV
14V
W9353
IC9901
S-812C33AMC-C2N-T2
RX: 3.3V
1 5
IC9921 IC9941
GND NC
BA033FP TA7805F
2
VIN
1
3 4 2
VOUT NC I O I
G G
3
RX: 3.25V
50MS
HFS
R9602
47k
W9692
1 24
XIN XOUT
SST5 R9603 1k 2 23
CE PDB2
PCK5 R9604 1k 3 22
CL PDB1
R9611 R9612 L9621
PDT5 R9605 1k 4 21
DI AIA 1k 47k 1812CS
5 20
FM MODE: 0V
LDB AOB
OTHER MODE: 3.1V
ULS 6 19
LDA OUTB
7 18
CA CB
R9608
8 17
470k TEST VDD
R9606 2.2k 9 16
PDA2 PIB
C9607
R9607 4.7k 10 15
PDA1 VSS 0.0047 W9610
R9600
11 14
1k AIA PIA
FMS 12 13
AOA OUTA
Q9600 IC9601
2SK3018 C9610
LC7153M
22
14V
8V
FSKK
4 4
IC7001 V+ IC2401 V+
NJM2902M NJM2902M
GND GND
R7009
11 470k 11
C7004
R7103
0.1
IC700 220k
NJM2902M
C7006 R7008
6
R7006 R7101
2 0.1 120k - 7 13
- -
82k 1 5 10k 14
3 R7010 + 12
+ +
100k
IC7001 IC2401
NJM2902M NJM2902M
SNDS
5V
14V
8V
C7306
IC7201
1000
M5282FP
1 10
VCC2 VCC
2 9
IN+ VCAOUT
3 8
IN- CTL C7301
4 7
10
OUT VCAIN
5 6
GND NC
C7207 10 C7209 10
R7207
10k
HV
VCC
50MHz band: 1.2V
OTHER band: 4.9V
[EUR],[USA],[KOR]only
Q9964
R9401 C9406 L9403 C9407 C9409 R9403 DTA114EE
P5V
1k 12p 68n 68p 68p 18
R9963
Q9401
1k
L9402 C9404
DTA114EE
68n 4p
L9401
C9402
56n RX: 7.9V
12p Q9966
2SK3018
RX: 5.0V
Q9963
DTA114EE
IC9681
TA78L05F
Q9681 2SC4081
O I
R9961
G
1k
RX: 4.2V
Q9965
2SK3018
H3V
HV
14V
3V
5V
8V
IC9961
BA08FP
Q9967 Q9968
RX: 4.9V DTA114EE ECH8301
O I O
G 1 8
S D
2 7
S D
3 6
S D
RX: 7.9V
4 5
G D
POWER 9.6V: 9.5V
Q9960
L9960
13.8V: 10.9V
PWRS
2SK3018
LR-270
L9622
E544GN-110248
R9654
100
C9626
12p
C9654 L9672
27p W9672 0.12
C9623
Q9621 C9632
56p
2SK210 1p
L9624 C9622
Q9651
1812CS 4p
2SC4673
W9673 W9674
5V
C9621 1
R9621 2.2k
3V
8V
FSKK
TX: 3.2V
RX: 0V
8V
SEND
SNDK
R6602 D6601 R6662 D6661
33k MA2S111 33k MA2S111
R6641
Q6601 Q6661
1k
2SC4081 2SC4081
Q6641
2SK3065
SNDS
TX:3.1V
RX: 0V
SNDK
Q7351
Q7371
2SB1132
ECH8301
1 8
S D
Q7352
2 7
2SC4081 S D
3 6
S D
4 5
G D
C7371
R7376
1000
82k
L7351 BM27-400-6A
Q7372 L7371
2SK3018 BM27-400-6A
11 - 6
BUS LINE1
14V
5V
T8L
8V
3V
BUS LINE6
8V
PSS
MAIN
UNIT
(6)
8V
0.86V
15.6nS
R9673
18
W9676
FMOD
8V
SEND
FSK
BAND
ESPO
HV
BUS LINE3