Icom i703 Manuals

Manuals and User Guides for Icom i703. We have 1 Icom i703 manual available for free PDF download: Service Manual

Icom i703 Service Manual

Icom i703 Service Manual (78 pages)

HF/ 50MHz ALL MODE TRANSCEIVER

Brand: Icom | Category: Transceiver | Size: 10.16 MB

Table of Contents

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
- 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
- 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

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