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IC-703
Icom IC-703 Service Manual
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1
1
4
5
8
25
75
76
100
50
26
1
1
1
10
20
11
12
24
13
4
58
51
1
8
8
1
5
8
4
1
14
6
10
5
1
4
8
5
1
1
4
8
5
8
5
5
4
16
9
15
10
6
64
13
1
4
8
5
to P
A unit J100
PA
I
P3
P2
to P
A unit J300
RX
P5
P4
ST
ART
1
to P
A unit J1
17
21
8
J6701
TPWR
POWS
GND
14V
14V
GND
T8V
NC
KEY
3V
GND
NC
14V
NC
NC
8V
HV
GND
1
to P
A unit J41
17
21
8
J6751
TSWL
TPHK
REFL
GND
MCK3
PWRS
TOE
IDH
TGK
TPZS
TPZL
FORL
DRES
MDT3
TDTS
IDL
GND
LRXD
71
8
to JACK
board J1
2
J5101
L
TXD
8V
AFO
GND
MIC
MICE
PWRK
DRES
10
2
to UT
-106
9
1
J2453
DSTB
MCK
DSPS
GND
DINT
MDT
5V
GND
GND
MSST
17
2
to Optional
unit UT
-102
8
J7121
MCK
GND
SPCH
MDT
SPBK
5V
GND
AFI
1
to UT
-106
2
J2452
AFIE
NC
1
4
to UT
-106
J2451
NC
AFIE
AFI
ACC
REMOTE
KEY
EXT SP
DATA
DAFO
PTTP
DIN
3
5
1
4
6
2
J6851
SQLS
DOUT
1
2
3
4
5
6
7
8
9
10
11
12
13
J6951
BDT
SEND
14V
NC
AAFO
AMOD
SQLS
8V
GND
1
2
4
3
BAND
EALC
KEY
FSK
9
10
5
6
8
7
12
11
13
MIC
2
8
1
7
J6801
MUDL
SEND
MIC
SQLS
8V
AFO
MICE
GND
ISPO
12
J7372
ESPE
8-4
MAIN UNIT
•
TOP VIEW
8 - 3
61
63
Table of Contents
Default Chapter
2
Introduction
2
Ordering Parts
2
Repair Notes
2
Table of Contents
3
Specifications
4
General
4
Receiver
4
Transmitter
4
Inside Views
5
Display Board
5
Pa Unit
5
Main Unit
6
Circuit Description
7
Receiver Circuits
7
Rf Circuit (Pa and Main Units)
7
Preamplifier Circuit (Main Unit)
7
2Nd Mixer Circuit (Main Unit)
8
Noise Blanker Circuit (Main Unit)
8
2Nd if Circuit (Main Unit)
8
If Shift Circuit (Main Unit)
8
Agc Circuit (Main Unit)
9
S-Meter Circuit (Main Unit)
9
Squelch Circuit (Main Unit)
9
Demodulator Circuits (Main Unit)
9
Transmitter Circuits
10
Af Selector Switch (Main Unit)
10
Af Amplifier Circuit (Main Unit)
10
Microphone Amplifier Circuit
10
Fm Modulation Circuit (Main Unit)
11
Transmitter if Circuit (Main Unit)
11
Rf Circuit
11
Alc Circuit
11
Apc Circuit
12
Rf, Alc, Swr Meter Circuits
12
Frequency Construction
12
Power Meter
12
Pll Circuits
13
Antenna Tuner Circuits
13
1St lo Pll Circuit (Main Unit)
13
Antenna Matching Network Circuit
13
Output Power Detecting Circuit
14
Impedance Detecting Circuit
14
Phase Detecting Circuit (Pa Unit)
14
Swr Detecting Circuit (Pa Unit)
14
Power Supply Circuits
15
Cpu Port Allocations
15
Voltage Lines (Main Unit)
15
Pa Unit Voltage Lines
15
Sub Cpu Port Allocations
17
Adjustment Procedures
18
Preparation before Servicing
18
Required Test Equipment
18
Connections
18
Pll Adjustments
19
Main Unit Top View
20
Transmitter Adjustments
21
Receiver Adjustments
25
SET MODE ADJUSTMENTS (No.1)
27
Pa Unit Adjustments
29
Pa Unit Top View
30
SET MODE ADJUSTMENTS (No.2)
31
Parts List
32
Vr Unit
32
Jack Unit
32
Display Unit
32
Section 8 Board Layouts
53
Section 7 Semi-Conductor Information
53
Section 6 Mechanical Parts
53
Display Board
53
Mechanical Parts and Disassembly
53
Jack Board
54
Screw Abbreviations A,BT: Self-Tapping PH: Pan Head
54
Vr Board
54
Diodes
59
Semi-Conductor Information
59
Transsistors and Fet’s
59
Board Layouts
60
Jack Board
60
Top View
60
Bottom View (Display Board)
61
Vr Board
61
Block Diagram
66
Main Unit
66
Section 9 Block Diagram
67
Wiring Diagrams
67
Pa Unit
67
Voltage Diagrams
68
Front Unit
68
Main Unit
69
Pa Unit
75
Other manuals for Icom IC-703
Instruction Manual
112 pages
Installing Manual
5 pages
4
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Icom IC-703 Specifications
General
Brand
Icom
Model
IC-703
Category
Transceiver
Language
English
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