C.E.C. ST630 - Page 9

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(D)

STYLUS

SET-DOWN

POSITION

IS

NOT

CORRESPONDING

TO

THE

RECORD

SIZE

Check

to

see

that

the

collector

voltage

at

(Q024)

against

GND

will

be

changed

from

approx.

+9V

to

approx.

OV

when

the

light

through

the

slit

on

the

turntable

platter

reaches

to

the

Photo

Transistor

(0301)

on

Record

PWB

Assy

(68).

NOTE:

Make

sure

that

no

outside

light

will

be

reached

to

photo

transistor

during

the

measurement.

Use

D.C.

voltmeter

or

oscilloscope

for

the

measurement.

*

No

change:

Photo

Transistor

(0301),

Cord

Assy

6P

(69-2)

or

(Q024)

is

defective.

*

Changing:

(1COO3)

is

defective.

NOTE:

After

replacement

the

part,

the

adjustment

according

to

ADJUSTMENT

(E)

on

page

7

should

be

applied.

(E)

TONEARM

MOVES

TOO

INSIDE

UPON

START

BUTTON

BEING

PRESSED

Check

to

see

that

the

collector

voltage

at

(PC401)

against

GND

with

the

oscilloscope

will

be

changed

by

8

pulses

per

one

turn

(from

approx.

+9V

to

approx.

OV)

according

to

the

turn

of

Shifter

(32)

which

has

8

slits.

*

No

change

or

small

number

of

pulse:

(PC401),

Cord

Assy

6P

(69-2),

(0021),

(A022)

or

(A023)

is

defective.

*

Changing:

(1CO03)

is

defective.

INFORMATION:

The

(ICO0O3)

acknowledges

that

the

tone-

arm

moves

to

the

stylus

set-down

and/or

return

position

when

the

number

of

the

pulse

from

the

start

point

corresponds

to

the

number

programmed

beforehand.

After

the

acknowledge-

ment,

(1CO03)

will

supply

the

necessary

signal

for

various

movement

according

to

the

position

of

tonearm.

(F)

NO

SOUND

FROM

THE

LOUD

SPEAKER

Measure

the

value

of

resistor

between

Output

Shield

Wire

(74)

and

its

shielded

part.

*

0

ohm:

The

Circuit

(65)

or

(67)

is

shortage

or

muting

relay

is

defective.

*

Approx.

coohm:

The

dead

circuit

or

defective

cartridge.

(G)

NO

MUTING

WORKS

UPON

STYLUS

UP

ACTION

Check

to

see

that

the

base-voltage

at

(0017)

against

GND

is

approx.

+9V

when

tonearm

is

in

up

position

upon

CUEING

button

being

pressed,

and

the

voltage

is

lowered

by

approx.

0.6V

upon

CUEING

button

being

pressed

again.

*

Yes:

(Q017),

(Q032)

or

muting

relay

is

defective.

*

No:

(1C0OO3)

is

defective.

(H)

THE

TONEARM

MOVES

LEFT-WARD

UPON

UP

AND

DOWN

ACTIONS

Apply

ADJUSTMENTS

(C),

(D)

and

(E)

(page

6

and

7).

(1)

THE

STYLUS

KICKS

THE

RECORD

UPON

ITS

UP

ACTION

Apply

ADJUSTMENTS

(C),

(D)

and

(E)

(page

6

and

7).

NOTE:

The

extent

up

to

0.2

mm

fall

within

the

specification

settled.

If

the

pitch

of

the

record

groove

increases,

this

figure

tends

to

increase.

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