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Icom IC-M422 Service Manual

Icom IC-M422
35 pages
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iC-m422

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Questions and Answers:

Icom IC-M422 Specifications

General IconGeneral
TypeRadio microphone
Volume control-
Noise reductionYes
Microphone sensitivity12 dB
Microphone input impedance50 Ω
Product colorWhite
Display typeLCD
Connectivity technologyWired
Power consumption (typical)4.5 W
Weight and Dimensions IconWeight and Dimensions
Depth193.3 mm
Width164 mm
Height78 mm
Microphone weight1072 g

Summary

DANGER

SECTION 1 SPECIFICATIONS

General Specifications

Device specifications including coverage, impedance, power, and dimensions.

Transmitter Specifications

Transmitter specifications including output power, modulation, and frequency.

Receiver Specifications

Receiver specifications including sensitivity, selectivity, and audio output.

SECTION 3 DISASSEMBLY INSTRUCTIONS

SECTION 4 CIRCUIT DESCRIPTION

Receiver Circuits

Detailed description of receiver signal paths, filters, and amplifiers.

Transmitter Circuits

Detailed description of transmitter signal paths, amplifiers, and control circuits.

2nd IF and Demodulator Circuits

Description of the second IF stage, demodulation, and AF output.

PLL Circuits

Description of Phase Locked Loop circuits for frequency stability.

SECTION 5 ADJUSTMENT PROCEDURES

Frequency Adjustment Procedures

Procedures for adjusting lock voltage and reference frequency.

Transmit Adjustment Procedures

Procedures for adjusting output power and frequency deviation.

Receive Adjustment Procedures

Procedures for adjusting sensitivity and squelch levels.

SECTION 6 PARTS LIST

SECTION 8 SEMICONDUCTOR INFORMATION

SECTION 9 BOARD LAYOUTS

SECTION 10 BLOCK DIAGRAM

SECTION 11 VOLTAGE DIAGRAM

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