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Kenwood TS-780 Service Manual

Kenwood TS-780
62 pages
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Kenwood TS-780 Specifications

General IconGeneral
BrandKenwood
ModelTS-780
CategoryTransceiver
LanguageEnglish

Summary

CIRCUIT DESCRIPTION

Receiver section

Details receiver front-end, mixers, filters, AGC, and FM demodulation.

Transmitter section

Explains audio path, balanced modulator, frequency modulation, and transmitter IF signal.

Control Circuit

Fundamental operation

Details CPU clock, ROM/RAM access, and program execution flow.

PARTS LIST

PC BOARD VIEWS

LEVEL DIAGRAM

RECEIVER SECTION

Diagram showing signal levels at various stages of the receiver circuit.

TRANSMITTER SECTION

Diagram showing signal levels at various stages of the transmitter circuit.

ADJUSTMENT

REQUIRED TEST EQUIPMENT

Lists essential test equipment for calibration and maintenance procedures.

Preparation

Provides initial setup steps and switch/knob settings before adjustments.

GENERAL ADJUSTMENT

Details voltage checks, mode settings, and specific voltage measurements for calibration.

RECEIVER ADJUSTMENT (2m BAND)

Covers BPF, sensitivity, and S meter adjustments for the 2m band.

RECEIVER ADJUSTMENT (70cm BAND)

Covers BPF, sensitivity, and S meter adjustments for the 70cm band.

TRANSMITTER ADJUSTMENT (2m BAND)

Details setting, power output, protection, and RF meter adjustments for 2m.

TRANSMITTER ADJUSTMENT (70cm BAND)

Details setting, power output, and protection adjustments for 70cm.

TRANSMITTER ADJUSTMENT (COMMON)

Covers common adjustments like carrier suppression and ALC meter.

Deviation

Procedure to adjust frequency deviation for FM transmission.

VOX (ANTI VOX) operation check

Steps to check and verify the VOX and Anti-VOX functions.

ENCODER ASS'Y ADJUSTMENT

MICROPROCESSOR OPERATION CHECK

REFERENCE DATA

BLOCK DIAGRAM/SP-71

SPECIFICATIONS

GENERAL

Lists general specifications like frequency range, modes, power, and dimensions.

TRANSMITTER SECTION

Details transmitter specifications including power output, modulation, and frequency response.

RECEIVER SECTION

Lists receiver specifications like sensitivity, IF frequencies, and selectivity.

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