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Icom IC-A4 Service Manual

Icom IC-A4
32 pages
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Icom IC-A4 Specifications

General IconGeneral
BrandIcom
ModelIC-A4
CategoryTransceiver
LanguageEnglish

Summary

DANGER

REPAIR NOTES

SECTION 1 SPECIFICATIONS

SECTION 3 DISASSEMBLY INSTRUCTIONS

SECTION 4 CIRCUIT DESCRIPTION

4-1 RECEIVER CIRCUITS

Detailed description of the receiver's signal path, including antenna switching, RF, mixer, IF, AM detector, and AF circuits.

4-2 TRANSMITTER CIRCUITS

Covers microphone amplifier, modulation, drive/power amplifier, and APC circuits for transmission.

SECTION 5 ADJUSTMENT PROCEDURES

5-2 RECEIVER ADJUSTMENT

TUNE VOLTAGE ADJUSTMENT

Procedure to adjust the tune voltage, specifying operating frequency and measurement points.

RF BPF ADJUSTMENT

Instructions for adjusting the RF Band Pass Filter, including SSG settings.

5-3 PLL ADJUSTMENT

PLL LOCK VOLTAGE ADJUSTMENT

Procedure for adjusting the PLL lock voltage, specifying frequency and measurement points.

5-4 TRANSMITTER ADJUSTMENT

IDLING CURRENT ADJUSTMENT

Adjusting the idling current for transmit, including measurement and connection details.

OUTPUT POWER ADJUSTMENT

Procedure for setting the output power, specifying frequency and measurement equipment.

MODULATION DEPTH ADJUSTMENT

Adjusting modulation depth for transmission, detailing SSG and analyzer settings.

SECTION 8 SEMI-CONDUCTOR INFORMATION

8-2 DIODES

SECTION 9 BOARD LAYOUTS

SECTION 10 BLOCK DIAGRAM

SECTION 11 VOLTAGE DIAGRAM

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