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Technics SA-EH750 Service Manual

Technics SA-EH750
58 pages
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Technics SA-EH750 Specifications

General IconGeneral
Power Output100 W
Input Sensitivity250 mV
TypeStereo Receiver
Output Power / Channel100 W
Tuner BandsFM/AM
Preset Station Qty30
Display TypeFluorescent
Frequency Response (Audio)10 Hz - 20 kHz
Input Impedance47 kΩ
Tuning Range87.5 - 108 MHz (FM), 531 - 1602 kHz (AM)

Summary

Specifications

Amplifier Section

Details power output, distortion, impedance, and sensitivity for the amplifier.

AM Tuner Section

Covers frequency range and sensitivity for the AM tuner.

Timer Section

Describes clock, timer, and sleep functions.

General

Provides power supply, consumption, dimensions, and weight.

Before Repair

Protection Circuitry

Explains the protection mechanism and reset procedure for speaker connections.

Accessories

Lists included accessories like power cords, antennas, and remote.

Caution for AC Mains Lead

CAUTION!

Warns about unsuitable plugs and severe electrical shock danger.

IMPORTANT

Details wiring color codes for AC mains lead connection.

Location of Controls

Tuner amplifier Controls

Describes the buttons and indicators on the main tuner amplifier unit.

Remote Control Functions

Explains the buttons and operations of the remote control unit.

Installation

Locating the Components

Guides on positioning the CD changer, tuner amplifier, speakers, etc., for optimal setup.

Speaker Placement & Mounting

Provides recommendations for center, surround, and wall-mounting speakers.

Connections

Connecting Speaker Cables

Illustrates how to connect speaker wires to the tuner amplifier and speakers.

Connecting Power and Antenna

Shows how to connect the AC power cord and antenna terminals.

Preparing the Remote Control

Battery Installation

Instructions for inserting batteries into the remote control.

Correct Method of Use

Guidelines for aiming the remote and avoiding obstacles.

External Unit Connections

Connecting DVD Players

Explains connections for 5.1 channel and standard DVD players.

Connecting Video Cassette Recorders

Describes how to connect a VCR for audio playback.

Optional Antenna Connections

FM/AM Outdoor Antenna Setup

Details how to connect outdoor antennas for improved reception.

Setting the Time

Setting the Time Procedure

Step-by-step guide for setting the 24-hour clock on the unit.

ECO mode Operation

Explains how to activate ECO mode for reduced standby power consumption.

Listening to Compact Disc

How to load CDs

Detailed instructions for inserting CDs into the changer trays.

To prevent damage

Important precautions to avoid damaging CDs and the unit.

Sequential Play

How to play CDs in sequence, including stopping and skipping tracks.

Direct Access Play

How to select and play specific tracks or discs directly.

Repeat Play

How to set the unit to repeat playing all tracks or favorite tracks.

Random Play

How to play tracks in a random, non-sequential order.

Program Play

How to program up to 24 tracks for playback in a custom sequence.

Boosting the Super Woofer

Super Woofer Operation

How to activate or deactivate the Super Woofer feature.

Using the Built-in Sound Quality/Sound Field Settings

Sound Quality Selection

How to choose between HEAVY, CLEAR, AI EQ, MANUAL, and FLAT sound settings.

Releasing the Equalizer

How to reset the sound quality setting to FLAT.

Varying Sound Quality with Manual EQ

Manual Equalizer Adjustment

How to adjust bass, midrange, and treble levels using the manual equalizer.

Releasing the Equalizer

How to reset the manual equalizer settings to FLAT.

Varying Sound Quality with AI EQ

AI EQ Adjustment

How to adjust surround level and sound quality using the AI EQ.

Releasing the Equalizer

How to reset the AI EQ settings to FLAT.

Surround Systems

6CH DISCRETE INPUT

Using 5.1 channel Dolby Digital sources with compatible DVD players.

DOLBY PRO LOGIC

Enjoying Dolby Surround sources with the unit's built-in circuitry.

SUPER SURROUND / SIMULATED STEREO

Adds surround effects to movie/music or stereo effects to monaural sources.

Virtual Rear Surround Effect

Makes surround sound seem to come from behind.

Center Focus Effect

Makes center speaker sound appear to come from the TV.

Multi Rear Surround Effect

Creates the sensation of multiple surround speakers.

Seat Position Function

Maintains sound position despite listener movement.

Enjoying Sound with 6 CH DISCRETE INPUT

Adjusting Speaker Volume

How to set individual speaker levels for optimal 5.1 channel playback.

Playback Dolby Surround

Playback Procedure

How to select and play Dolby Pro Logic sources.

Adjusting Speaker Volume

How to set individual speaker levels using the test signal.

Enjoying Sound with Stereophonics (SUPER SURROUND)

SUPER SURROUND Modes

How to select MOVIE or MUSIC modes for 5-channel surround effects.

Adjusting Surround Speaker Volume

How to manually adjust the output level of surround speakers.

Center Focus Effect

Makes center speaker sound appear to come from the TV.

Virtual Rear Surround Effect

Virtual Rear Surround Operation

Makes surround sound seem to come from behind.

Multi Rear Surround Effect

Multi Rear Surround Operation

Creates the sensation of multiple surround speakers.

Enjoy the Sound with Simulated Stereo

Simulated Stereo Operation

Adds stereo-like effects to monaural sound sources.

Using the Seat Position Function

Seat Position Adjustment

Adjusts listening position for better effect, especially with virtual rear surround.

Concerning the Display

Display Modes

Explains the different spectrum display types: Normal, Peak-hold, Aurora.

Using the External Unit

Listening to an External Source

How to select and play audio from external devices.

Recording from an External Source

Steps for recording audio from external sources onto a cassette tape.

Recording on an External Unit

How to record audio from the unit onto an external device.

Operation Checks and Component Replacement Procedures

Checking Tuner & Power Supply PCBs

Procedures for checking the tuner and power supply circuit boards.

Checking Operation PCB

Procedures for checking the operation circuit board.

Checking the Main PCB

Procedures for removing and checking the main circuit board.

Regulator Transistor Replacement

Step-by-step guide for replacing regulator transistors.

Power IC Replacement

Step-by-step guide for replacing the power IC.

Self-Diagnostic Mode

Displaying Malfunction Codes

How to display error codes indicating malfunctions (U70, F61).

Display Contents & Correction

Explains error codes, problems, and correction procedures like checking flat cables.

Schematic Diagram

Tuner Circuit Schematic

Lists the page number for the tuner circuit schematic.

Operation Circuit Schematic

Lists the page numbers for the operation circuit schematic.

Main Circuit Schematic

Lists the page numbers for the main circuit schematic.

Power Supply Circuit Schematic

Lists the page number for the power supply circuit schematic.

Speaker Terminal Circuit Schematic

Lists the page number for the speaker terminal circuit schematic.

Power Transformer Circuits Schematics

Lists page numbers for power transformer circuits (A & B).

Printed Circuit Board Diagram

A TUNER P.C.B.

Diagram showing the component layout for the tuner printed circuit board.

D POWER SUPPLY P.C.B.

Diagram showing the component layout for the power supply printed circuit board.

B OPERATION P.C.B.

Diagram showing the component layout for the operation printed circuit board.

C MAIN P.C.B.

Diagram showing the component layout for the main printed circuit board.

E SPEAKER TERMINAL P.C.B.

Diagram for the speaker terminal PCB.

F POWER TRANSFORMER (A) P.C.B.

Diagram for the power transformer (A) PCB.

G POWER TRANSFORMER (B) P.C.B.

Diagram for the power transformer (B) PCB.

Wiring Connection Diagram

Main PCB to Tuner PCB Connection

Shows wiring between Main and Tuner PCBs.

Power Supply & Transformer Connections

Illustrates connections for power supply and transformers.

Speaker Connections

Shows wiring for speakers to the Main PCB and Terminal PCB.

Terminal Function of IC's

IC901 System Control / FL Drive

Pin functions for the system control IC.

Other IC Terminal Functions

Pin functions for other ICs like LC72, IC101, IC102, IC151.

Block Diagram

Tuner and FM/AM IF Block

Illustrates the tuner and IF signal processing blocks.

PLL and Decoder Block

Shows the PLL synthesizer, decoder, and data processing blocks.

System Control / FL Drive Block

Shows the system control IC and its connections to FL display.

Audio Processing Blocks

Illustrates audio processing ICs like M62456FPE1 and LC72721NMTLM.

Power Amplifier Block

Shows the power amplifier IC (RSN311W64) and its connections.

Power Transformer & Regulator Block

Illustrates power transformer and regulator circuit blocks.

Replacement Parts List

Capacitors (C series)

Lists replacement parts for capacitors (C101-C701).

Resistors (R series)

Lists replacement parts for resistors (R102-R998).

Other Components (Diodes, ICs, Connectors, etc.)

Lists replacement parts for diodes, ICs, connectors, and other components.

Diodes (D series)

Lists replacement parts for diodes (D101-D758, D901-D974).

ICs, Transistors, Connectors, etc.

Lists replacement parts for ICs, transistors, connectors, and other parts.

Transistors (Q series)

Lists replacement parts for transistors (Q701-Q906).

Resistors (R series - Continued)

Lists replacement parts for resistors (R102-R998).

Other Components (Transformers, Oscillators, etc.)

Lists replacement parts for transformers, oscillators, and other miscellaneous components.

Resistors (R series - Final)

Lists replacement parts for resistors (R910-R998).

Other Components (Transformers, Oscillators, Switches, etc.)

Lists replacement parts for transformers, oscillators, switches, and other miscellaneous components.

Cabinet Parts Location

Main Unit Cabinet Parts

Exploded view and part numbers for the main unit's chassis and front panel.

Speaker and Accessory Parts

Lists part numbers for speaker grilles, badges, screws, and other cabinet parts.

Packaging

System Component Packaging

Diagrams showing how the main unit and accessories are packaged for shipping.

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