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Icom IC-707 Service Manual

Icom IC-707
72 pages
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Icom IC-707 Specifications

General IconGeneral
TypeHF Transceiver
Weight4.5 kg
Image rejectionMore than 70 dB
IF rejectionMore than 70 dB
Voltage13.8 V DC
ModesAM, FM
Power Output100 watts
Current drain20 A
Power Supply13.8V DC
Receiver Sensitivity0.16 μV (SSB, CW, 10 dB S/N)

Summary

Safety Precautions

Electrical Hazards

Warning against connecting to AC or >16V DC, reversing polarity.

Environmental Hazards

Warning against exposure to rain, snow, liquids.

RF Signal Warning

Caution against applying >20 dBm RF to antenna connector.

SECTION 1 SPECIFICATIONS

SECTION 4 CIRCUIT DESCRIPTION

Transmitter Circuits

Details microphone amp, balanced modulator, CW keying, and IF amplifier.

SECTION 5 ADJUSTMENT PROCEDURES

Preparation Before Servicing

Lists required test equipment and connection diagrams.

PLL Adjustment Procedures

Covers reference frequency and BFO lock voltage adjustments.

Receiver Adjustment Procedures

Details total gain, S-meter, noise blanker, 1st LO trap, and RIT adjustments.

Transmitter Adjustment Procedures

Covers idling current, SWR, gain, power, modulation, and delay time.

SECTION 8 BOARD LAYOUTS

SECTION 11 VOLTAGE DIAGRAMS

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