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Technics ST-HD55

Technics ST-HD55
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Technics ST-HD55 Specifications

General IconGeneral
Tuning Range (FM)87.5 - 108 MHz
Signal-to-Noise Ratio (AM)50 dB
TypeDigital Tuner
Tuning BandsFM
Frequency Response (FM)20Hz to 15kHz

Summary

Specifications

Pre-amplifier section

Input sensitivity/impedance and output level details.

FM tuner section

FM frequency range, S/N, and antenna terminal information.

AM tuner section

AM frequency range specifications.

Timer section

Details on clock type and programmable timer functions.

General

Overall dimensions and weight of the unit.

About the Self-Diagnostic Mode

Display method

Explains how the self-diagnostic mode displays malfunction codes.

Display contents

Lists display codes, corresponding problems, and correction procedures.

Blue LED

Power Source ONOFF and Signal Check

Operation Checks and Main Component Replacement Procedures

Checking for the tuner P.C.B. and FL P.C.B.

Steps for checking the tuner and FL printed circuit boards.

Checking for the main P.C.B.

Steps for checking the main printed circuit board.

Wiring Connection Diagram

Block Diagram

TUNER P.C.B.

FL P.C.B.

FINOUT TERMINAL P.C.B.

OPERATION P.C.B.

LED(L) P.C.B.

LED(R) P.C.B.

CONNECTOR P.C.B.

H MAIN P.C.B.

Schematic Diagram

TUNER CIRCUIT

Detailed schematic of the tuner circuit.

FL CIRCUIT

Detailed schematic of the FL display circuit.

OPERATION CIRCUIT

Detailed schematic of the operation control circuit.

LED (L) CIRCUIT

Detailed schematic of the left LED circuit.

LED (R) CIRCUIT

Detailed schematic of the right LED circuit.

FINOUT TERMINAL CIRCUIT

Detailed schematic of the input/output terminal circuit.

CONNECTOR CIRCUIT

Detailed schematic of the connector circuit.

MAIN CIRCUIT

Detailed schematic of the main circuit.

Terminal Function of ICs

IC401 (M30610 MA171 F): SYSTEM CONTROL

Pin functions for the System Control IC.

IC601 (M38197 MAA-608 FP): FL DRIVE

IC202 (M62433 AFP): DIGITAL SOUND CONTROL

Type Illustration of ICs, Transistors and Diodes

Cabinet Parts Location

Replacement Parts List

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