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Icom IC-25A Service Manual

Icom IC-25A
76 pages
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Table of Contents

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Icom IC-25A Specifications

General IconGeneral
BrandIcom
ModelIC-25A
CategoryTransceiver
LanguageEnglish

Summary

SPECIFICATIONS

TRANSMITTER SPECIFICATIONS

Outlines transmitter specifications including output power, modulation, and frequency deviation.

RECEIVER SPECIFICATIONS

Lists receiver specifications such as sensitivity, selectivity, and audio output power.

CONTROLS AND THEIR FUNCTIONS

FRONT PANEL CONTROLS

Details the functions and operation of front panel controls and indicators.

REAR PANEL CONNECTORS

Describes the rear panel connectors and ports for external connections.

BLOCK DIAGRAM

OPERATION

RECEIVER OPERATION

Explains the operational blocks and signal flow within the receiver section.

TRANSMITTER OPERATION

Outlines the operational blocks and signal flow within the transmitter section.

ORDER OF DISASSEMBLY

ADJUSTMENTS

PLL ADJUSTMENT PROCEDURES

Provides detailed procedures for adjusting PLL frequency, LO level, and VCO voltage.

RECEIVER ADJUSTMENT PROCEDURES

Details procedures for adjusting receiver sensitivity, discriminator, S-meter, squelch, and AF output.

TRANSMITTER ADJUSTMENT PROCEDURES

Provides procedures for adjusting transmitter output power, RF meter, and modulation.

MODULATION ADJUSTMENT PROCEDURES

Details procedures for adjusting signal modulation characteristics like frequency and deviation.

TROUBLESHOOTING GUIDE

PLL UNLOCKED TROUBLESHOOTING

Guides troubleshooting for when the PLL is unlocked.

RECEPTION ISSUES TROUBLESHOOTING

Guides troubleshooting for reception problems.

TRANSMISSION POWER OUTPUT ISSUES

Guides troubleshooting for lack of power during transmission.

DISPLAY NOT WORKING TROUBLESHOOTING

Guides troubleshooting for issues related to the display not working.

PARTS LIST

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