Icom IC-821H Manuals

Manuals and User Guides for Icom IC-821H. We have 1 Icom IC-821H manual available for free PDF download: Service Manual

Icom IC-821H Service Manual

Icom IC-821H Service Manual (110 pages)

vhf/uhf all mode

Brand: Icom | Category: Transceiver | Size: 8.32 MB

Table of Contents

Repair Notes
2
Table of Contents
3
Specifications
4
Disassembly Instructions
5
Opening the Transceiver's Case
5
Removing the PA-A Unit
5
Opening the Inside Chassis
5
Inside Views
6
Main Unit
6
Vhf Antenna Switching Circuit
8
Vhf Rf Circuit (Rf-A Unit)
8
Receiver Circuit
8
Circuit Description
8
- 10 Mhz if CIRCUIT (MAIN UNIT)
  9
- Demodulator Circuit (Main Unit)
  9
- Squelch Circuit (Main Unit)
  9
- Squelch Control Circuit
  9
- Af Amplifier Circuit (Main Unit)
  10
- Agc Circuit (Main Unit)
  10
- Noise Blanker Circuit
  10
- Microphone Amplifier Circuit
  11
- Modulation Circuit (Main Unit)
  11
- S-Meter Circuit (Main Unit)
  11
- Transmitter Circuits
  11
  - Alc Circuit
    12
  - Power Amplifier Circuit
    12
  - Rf Circuit (Rf-A and Rf-B Units)
    12
  - Transmit if Amplifier Circuit
    12
  - Apc Circuit
    13
  - Pll Circuits
    13
  - Vhf Pll Circuit (Pll Unit)
    13
- Port Allocations
  14
- Power Supply Circuits
  14
  - Uhf Pll Circuit (Pll Unit)
    14
  - Voltage Lines
    14
  - Output Expander Ics
    15
Adjustment Procedures
17
- Preparation before Servicing
  17
  - Required Test Equipment
    17
  - Connections
    17
- Pll Adjustment
  18
- Frequency Adjustment
  18
- Receiver Adjustment
  20
- Transmitter Adjustment
  24
- Meter and Squelch Adjustment
  28
- Rf Meter Adjustment
  29
- Meter Reference Adjustment
  29
Parts List
30
Mechanical Parts
53
- Front
  54
  - Semi-Conductor Information
    59
  - Transistors and Fet's
    59
  - Diodes
    60
  - Board Layouts
    61
  - Front Unit
    61
- Main Unit
  68
- Rf-A and Rf-B Units
  84
Section 10 Block Diagram
88
Voltage Diagram
91

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