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IC-703
Icom IC-703 Service Manual
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2 - 1
SECTION 2
INSIDE
VIEWS
•
DISPLA
Y BOARD
Sub CPU
(IC6:
HD6473847RH)
+5V regulator
Main dial
Reset IC
(IC4:
S-80945CLMC-G7F)
SW LED dimmer
Q50:
2SB1132
Q51:
2SC4081
LCD driver
(IC2:
SED1522F0C)
VR board
Back light dimmer
Q2:
2SB1132
Q3:
2SC4081
K
ey dimmer
Q13:
2SB1132
Q14:
2SC4081
Sub CPU
(IC6:
HD6433842RB27H)
+5V regulator
Main dial
Reset IC
(IC4:
S-80945CLMC-G7F)
SW LED dimmer
Q50:
2SB1132
Q51:
2SC4081
LCD driver
(IC2:
SED1522F0C)
VR board
Back light dimmer
Q2:
2SB1132
Q3:
2SC4081
K
ey dimmer
Q13:
2SB1132
Q14:
2SC4081
•
P
A UNIT
Expand IC
(IC600:
ISPLSI2064VE)
Buffer
(IC560:
NJM2904M)
Comparator
(IC640:
T
A75393)
Low-pass filter
TX/ RX switch
(RL250:
A
TN207)
Drive amplifier
(Q150:
RD01MUS1)
Pre drive amplifier
(Q101:
2SK3074)
P
ow
er amplifier
(Q200, Q201:
(Q200, Q201:
RD07MVS1)
RD07MVS1)
Expand IC
(IC600:
ISPLSI2064VE)
Buffer
(IC560:
NJM2904M)
Comparator
(IC640:
T
A75393)
Low-pass filter
TX/ RX switch
(RL250:
A
TN207)
Drive amplifier
(Q150:
RD01MUS1)
Pre drive amplifier
(Q101:
2SK3074)
P
ow
er amplifier
(Q200, Q201:
RD07MVS1)
4
6
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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