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Yaesu FT-857/FT-857D Technical Supplement

This document provides essential technical information for the servicing of the Yaesu FT-857/FT-857D HF/VHF/UHF Ultra-Compact Transceiver.

Overview

This technical supplement is designed for qualified technicians and details the internal workings, specifications, and servicing procedures for the FT-857/FT-857D transceiver. It covers various circuit descriptions, including receive signal paths, transmit signal circuitry, and the PLL frequency synthesizer. The document also outlines necessary test equipment and precautions for alignment procedures.

The transceiver utilizes surface-mount chip components, requiring specialized expertise for servicing. Yaesu Musen Co., Ltd. assumes no liability for damage resulting from errors or unauthorized servicing attempts.

Key Features and Specifications

Frequency Range: Receive: 0.1-56 MHz, 76-108 MHz, 118-164 MHz, 420-470 MHz; Transmit: Amateur bands from 160m to 70cm.
Emission Modes: A1 (CW), A3 (AM), A3J (LSB/USB), F3 (FM), F1 (9600 bps packet), F2 (1200 bps packet).
Power Output: Up to 100W (SSB/CW/FM) on HF/6M, 50W on 2M, and 20W on 70cm.
Sensitivity: High sensitivity across all bands, with specific values provided for SSB/CW, AM, and FM modes.
Construction: Assembled using lead-free solder compliant with RoHS specifications.

Servicing Information

This manual includes detailed block diagrams, exploded views, and parts lists to aid in troubleshooting and repair. Specific sections are dedicated to the alignment of various circuits, emphasizing the need for proper test equipment and adherence to procedures.

For detailed schematics, layouts, and parts for each unit (MAIN, PLL, PA, PANEL, REF, PHONE-JACK, VR, CONNECTOR, DSP-2, TCXO-9), refer to the respective sections within this supplement.

Important Notes

Servicing requires expertise in handling surface-mount components.
Unauthorized servicing attempts may void the warranty and could be illegal.
Repairs must use lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu).
Specifications are subject to change without notice and are guaranteed within amateur bands only.

Resources

For further information on Yaesu products, please visit the official Yaesu website.

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