THOMSON Proscan LaserDisc PSLD40 Guida all'installazione

PRoScAN

RCA

LASER

si?

Technical

Training

Manual

THOMSON

CONSUMER

ELECTRONICS

INC.

/TECHNICAL

TRAINING

P.O.

BOX

1976

INDIANAPOLIS

46206

WorldRadioHistory

FOREWORD

8.we

This

technical

training

manual

addresses

the

operation

and

troubleshooting

the

ProScan

model

PSLD40

and

RCA

model

LDR300.

The

principles

operation

and

troubleshooting

techniques

presented

this

manual

can

applied

all

laser

disc

players.

NOTE:

This

manual

intended

used

servicing

aid

and

not

intended

replace

the

service

data.

Servica

data

for

these

instruments

contain

specific

informa-

tion

parts,

safety,

and

alignment

procedures.

Service

data

should

consulted

before

performing

any

service.

Safety

Information

Caution

Safety

information

contained

the

appropriate

RCA

ProScan

Service

Data.

All

product

safety

requirements

and

testing

must

completed

prior

returning

the

instrument

the

consumer.

Servicers

who

defeat

safety

features

fail

perform

safety

checks

may

liable

for

any

resulting

damages,

and

may

expose

themselves

and

others

possible

injury.

CAUTION;

The

laser

diode

emits

invisible

infrared

radiation,

which

dangerous

the

eyes.

When

servicing

the

laser

disc

player

not

look

directly

into

the

laser

lens.

NOTE:

All

integrated

circuits

and

many

other

semiconductors

are

electrostatically

sensitive

and

require

special

handling

techniques.

Prepared

Thomson

Consumer

Electronics,

Inc.

Technical

Training

600

Sherman

Drive

Indianapolis.

Indiana

46201

First

Edition

9043

First

Printing

1990

Thomson

Consumer

Electronics,

Inc.

Trademark(s)

Registered

Marca(s)

Registrada(s)

WorldRadioHistory

CONTENTS

Introduction

Features

Laser

Disc

Overview

Video

Disc

Digital

Audio

The

Laser

Disc

Player

Overview

LDR300

Mechanism

System

Control

Servo

Signal

Processing

Overview

PSLD40

Mechanism

System

Control

Servo

Signal

circuits

Service

Procedures

System

Control

LDR300

PSLD40

Servo

Section

Focus

Servo

Height

Servo

Tracking

Servo

Slider

Servo

Tilt

Servo

Time

Base

Correction

Servo

Signal

Processing

Section

Video

Section

Digital

Audio

Analog

Audio

WorldRadioHistory

Appendixes

Appendix

Test

Mode

Appendix

Laser

Power

Confirmation

Appendix

Laser

Lens

Cleaning

Appendix

IC201

(Digital

Audio

Decoder)

Appendix

ICI

(Mode

Control

Microprocessor)

Appendix

IC801

(Mechanical

Control

Microprocessor)

Appendix

IC601

(Servo

Controller)

Appendix

IC901

(Time

Base

Correction

Servo)

WorldRadioHistory

INTRODUCTION

The

ProScan

PSLD40

and

the

RCA

LDR300

can be

grouped

into

new

category

called

multi

players,

these

players

have

the

ability

playing

all

available

laser

disc

formats.

The

advantage

multi

player

the

elimination

of separate

components

play

video

discs

and

compact

audio

discs.

This

advantage

alone

saves

space

and

greatly

sim-

plifies

connecting

the

laser

disc

player

the

audio

video

system.

Both

the

RCA

and

ProScan

disc

players

implement

new

features

not

previously

found

laser

disc

players.

One

these

features

one

bit

digital

analog

converter.

The

new

design

generates

less

noise

the

conversion

process

when

compared

multi-bit

converters.

The

PSLD40

has

additional

feature

dual

side

play-

back.

This

enables

the

PLSD40

play

both

sides

laser

disc

without

having

remove

the

disc

from

the

player.

This

allows

remote

control

selection

informa-

tion

from

either

side

laser

disc.

Features

Some

additional

features

the

PSLD40

and

the

LDR300

are.

On-Screen

Programming

Displays

the

operating

status

the

player

the

televi-

sion

screen,

and

the

front

the

unit.

Plus,

video

prompts

are

used

assist

the

operator

programming

the players

features.

Direct

Access

Play

Instantly

accesses

any

point

disc for

playback.

The

player

searches

for

that

point

and

resumes

normal

play-

back

from

that

point

forward.

Memory

Repeat

the

operator's

command,

memorizes

location

disc.

The

player

will

then

for that

point

and

resume

playback.

Still

Frame

CLV

(Constant

Linear

Velocity)

formatted

discs

the

laser

disc

player

can

still

pause

one

frame

video.

Because

there

physical

contact

between

the

pickup

the

player

and

the

disc,

this

pause

can

held

indefinitely.

Intro

Scan

Plays

the

first

seconds

each

chapter

track

disc.

This

gives

preview

all

the

material

recorded

the

disc.

Random

Playback

Plays

chapters

tracks

disc in

random

order.

This

allows

familiar disc

played

back

unfamil-

iar

order.

Auto

Program

Editing

Automatically

calculates

the length of

songs,

tracks

disc

that

will

fit

order,

each

side

tape.

Stores

the

time

into

memory

and

uses

this

information

place

the

laser

disc

player

pause

mode,

when

one

side

the

tape

full.

This

greatly

simplifies

dubbing

from

laser

disc

tape.

Compu

Program

Editing

Determines

the length of

the

songs,

tracks

disc.

Then

resequences

the

songs or

tracks

fit

the

maximum

amount

of material

each

side

tape.

The

laser

disc

player

then

plays

them

back

that

order

for

recording

onto

tape.

this

mode

the

laser

disc

player

will

auto-

matically

into

pause

mode

when

one

side

the

tape

full.

Videoline"'

Remote

Compatibility

Permits

RCA

stereo

monitor-receivers

with

Vid

olinkTM

remote

control

command

the

laser

disc

player.

WorldRadioHistory

LASER

DISC

OVERVIEW

the

reproduction

video

and

audio

signals,

the

laser

disc

format

has

definite

advantages

over

the

tape

and

records.

video

reproduction

the

laser

disc

can

reproduce

425

lines

horizontal

resolution,

out

performing

broadcast,

cable,

and

video

tape

formats.

Audio

reproduction

with

the

laser

disc

player

provides

the

clearest,

and

cleanest

audio

available

for

home

use.

the

laser

disc

system

laser

beam

focused

the

surface

rotating

disc.

The

disc

has

series

bumps

(commonly

called

pits)

etched

spirally

from

the

inside

edge

the

outside

edge

its

surface.

Information

stored

the

disc

varying

the

length

these

pits.

detect

this

information

the

laser

disc

player

monitors

the

level

light

that

reflected

from

the

discs

surface

back

into

the

optics

the

laser

disc

player.

For

example,

the

laser

beam

strikes

flat

surface

the

disc,

all

the

beam

reflected

back

into

the

optics

the

player.

comparison,

the

beam

strikes

bump

(or

pit)

the

disc

surface

some

the

light

reflected

away

from

the

optics

reducing

the

amount

laser

light

entering

the

1/4

WAVELENGTH

LASER

optics.

The

laser

light

that

not

reflected

away

from

the

optics

canceled

the

laser

light

being

transmitted

the

laser

assembly.

This

cancellation

caused

the

height

the

bump

above

the

disc

surface.

This

height

1/4

wavelength,

when

the

laser

beam

strikes

the

bump

it's

phase

shifted

180

degrees

(See

Fig

3).

When

the

phase

shifted

reflected

signal

strikes

the

transmitted

laser

light

the

two

signals

cancel

out,

further

reducing

the

amount

laser

light

being

reflected

back

into

the

optics

the

laser

disc

player.

The

light

that

reflected

back

into

the

optics

the

player

varies

amplitude

the

beam

strikes

the

differ-

ent

surfaces

the

disc.

This

varying

light

separated

from

the

transmitted

light

the

optics

the

laser

assembly.

Once

separated

the

reflected

light

applied

sensor

that

converts

the

varying

levels

into

electrical

signal.

This

electrical

signal

called

the

signal.

The

frequency

the

signal

the

length

the

pits

(See

Fig

4).

The

signal

then

passed

into

the

signal

processing

stages

where

demodulated.

BEAM

STRIKING

PIT

Fig.

3 -

Pit

Detection

ttt

BEAM

STRIKING

FLAT

SURFACE

WorldRadioHistory

Fig.

4 -

Signal

The

processing

and

demodulation

the

signal

depends

the

type

information recorded

the

disc.

For

example,

process

signal

that

carries

video

information,

the

signal

must

demodulated.

signal that

contains

digital

audio

signal

must

through

processing

convert

back

analog

signal.

Video

Disc

the

video

disc

format,

the

video

information

and

the

analog

audio

information

are

independently

modu-

lated

and

recorded

the

disc.

digital

audio

signal

can

also

added

some

discs.

This

digital

audio

sig-

nal

optional,

and

not

included

all

discs.

When

included

disc

multiplexed

with

the

modu-

lated

signals

for

recording

the

disc.

quip

The

frequency

spectrum

for

the

different

signals

rec-

orded

video

disc

shown

fig

The

video

infor-

mation

modulated

with

center

frequency

8.5

MHz

and

deviation

1.7

MHz.

Unlike

VCR

for-

mat

the

video

disc

format

does

not

separate

the

chroma

information

from

luminance

information

for

recording.

This

reduces

the

processing

involved

play

the

signal

back

and

provides

clearer

picture.

The

two

analog

audio

channels

are

modulated

2.3

MHz

for

chan-

nel

and

2.8

MHz

for

channel

Both

the

analog

audio

channels

have

deviation of

+/-

100

KHZ.

The

digital

audio

information

occupies

the

MHz

region

the

spectrum.

block

diagram

the

laser

disc

record

process

shown

fig

The

video

and

analog

audio

information

are

independently

modulated.

Once

modulated

the

WorldRadioHistory

DIGITAL

AUDIO

-10

-20

-30

2.3Mhz

CH1

ANALOG

AUDIO

2.8Mhz

CH2

ANALOG

AUDIO

8.1Mhz

9.3M

7.6Mhz

FIJ

I É

0 2 3 4 5 6 7 8 9

13 14

VIDEO

SIGNAL

VIDEO

MODULATOR

Fig.

5 -

Frequency

Spectrum

Player

AUDIO

J L

CHANNEL

MODULATOR

AUDIO

J R

CHANNEL

MODULATOR

DIGITAL

RIGHT

CHANNEL

DIGITAL

LEFT

CHANNEL

DIGITAL

AUDIO

PROCESSING

MIXER

VIDEO

ANALOG

AUDIO

MIXER

ANALOG

AUDIO.

VIDEO)

DIGITAL

Fig.

6 -

Record

Process

UMITER

GLASS

DISC

WorldRadioHistory

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