C.E.C. 530CD - Page 11

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ADJUSTMENT

PROCEDURES

ccontinuea)

6.

The

waveform

appears

again

if

the

OPEN/CLOSE

button

is

pressed

again.

This

allows

for

confirmation

to

be

made.

The

pick-up

is

faulty

if

confirmation

cannot

be

made.

SETTING

OF

INITIAL

POSITION

OF

VOLUME

1.

The

variable

resistors

are

set

to

the

following

initial

positions.

P101

(E-F

BALANCE)

.................

Mechanical

center

P102

(FOCUS

OFFSET)................

Mechanical

center

P103

(TRACKING

OFFSET)

...........

Mechanical

center

P104

(TRACKING

GAIN)...............

Mechanical

center

P105

(FOCUS

GAIN)..................5.

Mechanical

center

P106

(KICK

GAIN)

..............0..00005

Mechanical

center

FREE

RUN

FRECUENCY

ADJUSTMENT

1.

Turnon

the

power

and

set

the

unit

to

the

STOP

mode.

2.

Connect

the

frequency

counter

between

test

pin

VCO

of

connector

CN8

and

test

pin

GND

(use

probes).

3.

Rotate

the

core

of

the

PLL

OSC

coil

(T102)

with

a

plastic

screwdriver

so

that

the

frequency

counter

indicates

4.3218MHz.

FOCUS

OFFSET

ADJUSTMENT

1.

Turnon

the

power

and

set

the

unit

to

the

STOP

mode.

2.

Connect

a

DC

voltmeter

and

oscilloscope

between

test

pin

F-COIL

of

connector

CN6

and

test

pin

GND.

Short

test

pin

FOFF

of

connector

CN7

and

test

pin

GND.

3.

Adjust

P102

so

that

the

indication

on

the

DC

voltmeter

and

oscilloscope

is

OV+10mvV.

4.

Remove

the

short

between

test

pin

FOFF

and

test

pin

GND.

TRACKING

OFFSET

ADJUSTMENT

1.

Turnon

the

power

and

set

the

unit

to

the

STOP

mode.

2.

Connect

a

DC

voltmeter

and

oscilloscope

between

test

point

T-COIL

of

connector

CN6

and

test

pin

GND.

Short

test

pin

TP11

and

test

pin

GND.

3.

Adjust

P103

so

that

the

indication

on

the

DC

voltmeter

and

oscilloscope

is

OV+10mV.

4.

Remove

the

short

between

test

pin

TP11

and

test

pin

GND.

NOTE:

This

adjustment

should

be

made

again

after

the

adjustment

of

Tracking

Gain.

=41—

ADJUSTMENT

OF

DIFFRACTION

GRID

This

unit

uses

a

three

beam

method

for

the

laser

pick-up.

Diffraction

grid

adjustment

involves

adjusting

the

position

of

the

E

and

F

beams

in

relation

to

the

main

beam

so

that

they

are

in

the

same

line.

The

following

is

the

adjustment

procedure.

This

is

a

precise

12

GND

‘

adjustment

and

must

be

made

carefully.

Turn

on

the

power,

place

test

disk

YEDS4

on

the

table

load

and

set

the

unit

to

the

STOP

mode.

Short

test

pins

TP17

and

TP18

of

connector

CN6.

Short

test

pin

TROFF

(TP5)

of

connector

CN7

and

test

pin

GND.

Pass

test

pins

E

(TP3)

and

F

(TP2)

through

the

band

pass

filter,

and

connect

to

the

channels

of

the

dualtrace

oscilloscope.

The

ground

is

obtained

from

test

point

GND.

10K

0.047

Dualtrace

GND

Oscilloscope

F

——-w—Hi

Press

the

F.F

button.

The

TRACK/INDEX

indication

is

“2”

and

the

disk

begins

to

rotate.

Continue

to

press

the

PLAY/PAUSE

button.

The

unit

is

rotating

in

this

state

with

the

tracking

servo

turned

off.

Observe

the

resurge

waveform

of

the

waveform

indicated

on

the

oscilloscope

and

insert

the

adjustment

jig

into

the

diffraction

grid

holes

to

adjust

the

diffraction

grid

so

that

the

phase

difference

is

180°.

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