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Icom Manuals
Transceiver
IC-821H
Service manual
Icom IC-821H Service Manual
Vhf/uhf all mode
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Contents
Table of Contents
Bookmarks
Table of Contents
Repair Notes
Table of Contents
Specifications
Disassembly Instructions
Opening the Transceiver's Case
Removing the PA-A Unit
Opening the Inside Chassis
Inside Views
Main Unit
Vhf Antenna Switching Circuit
Vhf Rf Circuit (Rf-A Unit)
Receiver Circuit
Circuit Description
10 Mhz if CIRCUIT (MAIN UNIT)
Demodulator Circuit (Main Unit)
Squelch Circuit (Main Unit)
Squelch Control Circuit
Af Amplifier Circuit (Main Unit)
Agc Circuit (Main Unit)
Noise Blanker Circuit
Microphone Amplifier Circuit
Modulation Circuit (Main Unit)
S-Meter Circuit (Main Unit)
Transmitter Circuits
Alc Circuit
Power Amplifier Circuit
Rf Circuit (Rf-A and Rf-B Units)
Transmit if Amplifier Circuit
Apc Circuit
Pll Circuits
Vhf Pll Circuit (Pll Unit)
Port Allocations
Power Supply Circuits
Uhf Pll Circuit (Pll Unit)
Voltage Lines
Output Expander Ics
Adjustment Procedures
Preparation before Servicing
Required Test Equipment
Connections
Pll Adjustment
Frequency Adjustment
Receiver Adjustment
Transmitter Adjustment
Meter and Squelch Adjustment
Rf Meter Adjustment
Meter Reference Adjustment
Parts List
Mechanical Parts
Front
Semi-Conductor Information
Transistors and Fet's
Diodes
Board Layouts
Front Unit
Main Unit
Rf-A and Rf-B Units
Section 10 Block Diagram
Voltage Diagram
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VHF/UHF
ALL MODE TRANSCEIVER
IC-B21H
learn Inc.
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