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Sansui AU-999 Service Manual

Sansui AU-999
39 pages
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OPERATING
INSTRUCTIONS
&
SERVICE
MANUAL
SOLID-STATE
STEREO
AMPLIFIER
a
SANSUI
AU-999
Sansui.
SANSUI
ELECTRIC
CO.,
LTD.
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Sansui AU-999 Specifications

General IconGeneral
Power Output50 watts per channel into 8Ω (stereo)
Total Harmonic Distortion0.1%
Damping Factor50
Speaker Load Impedance4Ω to 16Ω
Input Sensitivity2.5mV (MM)
Channel Separation50dB
Signal to Noise Ratio70dB (MM), 90dB (line)

Summary

Switches and Controls

Power Indicator

Describes the power indicator light.

Speakers Switch

Manages speaker system connections.

Power Switch

Controls power to the unit and outlets.

Headphones Jack

For private listening with headphones.

Balance Check Switch

Checks speaker output balance.

Control Panel Features

Volume Control

Adjusts overall sound level.

Source Selector Switch

Selects audio input sources.

Mode Switch

Controls stereo/mono playback modes.

Balance Control

Compensates for channel imbalances.

Tone and Filter Controls

Tone Controls

Adjusts bass, midrange, and treble frequencies.

Tone Selectors

Sets specific frequencies for tone control adjustments.

Filters

Reduces unwanted low or high-frequency noise.

Tape Operation Controls

Tape Monitor Switch

Selects tape deck for audio monitoring.

Muting Switch

Attenuates signal for noise reduction purposes.

Tape-to-Tape Reprint

Facilitates copying audio tapes between decks.

Operations: Speaker and Record Player

Speaker Connections

Details how to connect loudspeakers to the amplifier.

Record Player Setup

Explains connecting and playing turntables.

Operations: Tuners and Microphones

Tuner Operation

Instructions for connecting and listening to radio broadcasts.

Microphone Usage

How to connect and operate microphones.

Operations: Tape Decks

Tape Deck Connections

How to connect tape recorders.

Recording on Tapes

How to record audio to tape.

Listening to Tapes

How to play back recorded tapes.

Tape Monitoring

How to monitor tape playback.

Tape-to-Tape Reprinting

How to copy tapes.

Electronic Crossover System

System Overview

Explains the advantages and function of the crossover system.

Connection Guide

Details how to set up the electronic crossover system.

Maintenance Procedures

General Maintenance Tips

Covers connectors, wiring, and placement.

Level Adjustments

Adjusting input signal levels.

Maintenance: Noise and Grounding

Hum and Howling

Resolving hum, howling issues.

Speaker Phasing

How to check speaker phasing.

Grounding Procedures

How to ground the system.

Maintenance: Fuses and Voltage

Fuse Information

Details on quick-acting and power fuses.

AC Outlets

Description of available AC outlets.

Voltage Adjustment

How to adjust operating voltage.

Specifications

Characteristics

Troubleshooting Chart

Tuner Issues

Common problems and solutions for tuner reception.

Troubleshooting Common Issues

Playback Device Issues

Troubleshooting record players and tape decks.

General Source Issues

Common problems affecting all audio sources.

Installation and Service

Custom Mounting

Instructions for installing the amplifier in a cabinet.

Disassembly Procedure

Technical Diagrams

Block and Level Diagrams

Visual representations of the amplifier's circuitry.

Alignment

Test Points Identification

Identifies test points for alignment procedures.

Alignment Procedures

Output Balance Adjustment

Procedure for adjusting output balance.

Current Adjustment

Procedure for adjusting current.

Parts List: Head Amp. Block

Parts List: Tone Control Block

Parts List: Driver Block

Parts List: Filter Block

Parts List: Filter Blocks

Ripple Filter Block Parts

Lists components for ripple filters.

SP Protector Block Parts

Lists components for speaker protection.

Parts List: Ripple Filter Blocks

Minus Ripple Filter Parts

Lists components for minus ripple filter.

Plus Ripple Filter Parts

Lists components for plus ripple filter.

Other Parts List

Resistors and Potentiometers

Lists various resistors and potentiometers.

Capacitors and Connectors

Lists capacitors, connectors, and other parts.

Other Parts List: Switches

Switches and Connectors

Lists various switches and connectors.

Component Location

Component Placement Diagram

Visual guide to component locations on chassis.

Chassis Layout

Top View Component Layout

Overall layout of components from the top.

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