Technics SJ-MD100

WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not
contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
©
1999 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.
ORDER NO. AD9903069S2
Colour
(K) ........ Black Type
Areas
(E) ........ Europe.
(EB) ...... Great Britain.
(EG)...... Germany.
SJ-MD100
Minidisc Deck
$ This document is supplementary to the
following Service Manual:
Supplement for technical information about MD.
$ Contents
Area Code
(E) (EB) (EG)
Order No.
MB9902001C2
Model No.
SJ-MD100
1. Measuring instruments and special tools
$ Purpose
O ROM Part No.: RFKV0006
O ROM Part No.: RFKV0014
O Extension Cable Kit
Part No.: RFKZJMD100EK
O Laser Power Meter Model No.: LE8010
Made by Laser Electric
Test Disc
Extension Cable Kit
Laser Power Meter
2. Basic Knowledge of MD
3. Operating Procedures
4. Troubleshooting Guide for MD Servo Circuit

Technics SJ-MD100 Specifications

General

Brand	Technics
Model	SJ-MD100
Category	MiniDisc Player
Language	English

Summary

Measuring Instruments and Special Tools

Basic Knowledge of MD

Definition of an MD and the Types of MDs

Defines MD and differentiates between playback-only and recordable types.

Construction of an MD

Explains the materials and physical structure of an MD disc and cartridge.

Recording on a Magnet Optic Disc

Recording Principle

Details the laser heating and magnetic field application for recording signals.

Vertical Magnetization System

Explains how data is stored vertically on the magnetic film for higher density.

Playback of a Recordable MD

Reading of Magnetic Signals

Explains signal reading using the Kerr effect and polarization shifts.

Rewriting Action of a Magnet Optic Disc

MD Rewriting Process

Describes the 'magnetic field modulation overwriting' process for data rewriting.

No Need for an Erasing Head

Highlights the efficiency of direct overwriting without a separate erasing stage.

Random Access on a Recordable MD

Random Access on a Playback-Only MD

Explains fast track access using TOC on playback-only discs.

Random Access on a Recordable MD

Details how pre-grooves and wobble are used for address recording and access.

User TOC Area

Describes the user-writable TOC for track data and editing capabilities.

ATRAC Signal Compression Technology

What Does the Word ATRAC Mean?

Defines ATRAC as an adaptive transform acoustic coding signal compression technology.

Why is Signal Compression Necessary?

Explains the need for compression due to data capacity vs. desired recording time.

Basic Concept of ATRAC

Details how ATRAC utilizes human auditory characteristics for data compression.

Composition of an MD System

Development of 6 LSIs

Lists and describes the functions of the six main LSIs in the MD system.

New Generation LSIs

Mentions newer, more integrated LSIs for improved MD system performance.

Operating Procedures

Play

Details the steps and signal flow for playing back an MD.

Record

Explains the signal path and process for recording onto an MD.

Control

Describes the functions of system control ICs for operation and display.

Clock

Explains the clock synchronization for various components.

Troubleshooting Guide for MD Servo Circuit