C.e.c. St630 User manual

SERVICE

MANUAL

—

MODEL—

ST630

Chuo

Denki

TABLE

OF

CONTENTS

Page

DESIGNATION

OF

PARTS.

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MECHANISM

OPERATING

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DISASSEMBLY

INSTRUCTIONS.

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WIRING

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43.

PARTS

LIST

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tees

18

FEATURES

Linear

Tracking,

Fully

Automatic

Direct

Drive

Turntable

SPECIFICATIONS

TURNTABLE

Output

voltage

3

mV

+3dB

at

1

KHz

3.54

cm/sec.

Motor

|

20-pole

30-slot

3-phase

brushless

Channel

balance

Within

2cB

at

1

KHz

type

DC

servo

controlled

direct-

Channel

separation

More

than

18dB

at

1KHz

drive

motor

Load

resistance

47

KQ

Speeds

33-1/3

and

45

r.p.m.

Weight

6g

gk

es

ead

eo

oe

7

OPERATION

Microcomputer-controlled

fully

Rumble

36dB

DIN45539A

(unweighted)

automatic

Automallc

Siar,

:

62dB

DIN45539B

(weighted)

return,

repeat

and

record

size

Turntable

platter

296mm

aluminum

alloy

die-cast

with

ae

selector

by

beam

sensor

strobe

outside

rim

(for

33-1/3

r.p.m.)

ee

DC

motor

controlled

_

Muting

Reed

relay

method

avoiding

TONEARM

shock

noise

—

Effective

length

<6

Gn

Speed

selector

Automatic

selection

by

beam

Tracking

error

Within

0.1°

sensor

(switchable

for

manual

Usable

cartridge

Universal,

P-mount

type

Seperation,

GENERAL

CARTRIDGE

.

Type

PM100,

P-mount

system,

with

0.6

mil

Power

consumption

12

watts

stylus

Induced

Magnet

type

Dimensions

416(w)

x

94(h)

x

346(d)

mm

Frequency

response

20—

20,000

Hz

Weight

4.5

Kg(net)

DESIGNATION

OF

PARTS

.

Dust

cover

.

Tonearm

Cartridge

.

Turntable

platter

.

Turntable

platter

mat.

.

Turntable

shaft

Hinge

.

Record

size

/

Safety

searcher

light

.

Record

size

/

Safety

searcher

crest

.

45

rpm

adapter

.

Neon

lamp

.

STOP

(®)

button

.

START

(<4)

button

.

CUEING

button

.

REPEAT

button

.

SPEED

SELECTOR

button

.

PITCH

CONTROL

knob

.

POWER

button

OMDNONAWN—

1.

SHOCK,

FIRE

HAZARD

SERVICE

TEST

CAUTION:

After

servicing

this

appliance

and

prior

to

re-

turning

to

customer,

measure

the

resistance

between

either

primary

AC

cord

connector

pins

(with

unit

NOT

connected

to

AC

mains

and

its

Power

switch

ON),

and

the

face

or

front

Panel

of

product

and

controls

and

chassis

bottom.

Lo

Zion

a

ee

NN

ee

mw

©

@

YM

®

(TaD)

Any

resistance

measurement

less

than

1

Megohms

should

Cause

unit

to

be

repaired

or

corrected

before

AC

power

is

applied,

and

verified

before

return

to

user/customer.

Ref.

UL

Standard

No.

1270.

Para.

66.

3.

D

(Mandatory

Test

after

servicing

Electrical

Appliances,

effective

7-1-83).

2.

MECHANISM

OPERATING

PRINCIPLES

(A)

RECORD

SIZE

SEARCHER

MECHANISM

An

optical

sensor

equipped

with

this

unit

automatically

searches

the

size

of

record

and

the

existence

of

record

as

well.

The

sensor

system

consists

of

the

lamp,

photo

transistor

and

the

slits

on

turntable

platter.

One

of

the

two

slits

on

turntable

platter

has

the

crest

which

works

as

a

shutter.

When

no

record

is

placed

on

the

platter,

the

photo

transistor

receives

light

from

the

lamp

twice

a

turn

through

the

two

slits;

when

a

17cm

record

is

placed,

the

photo

transistor

receives

light

once

a

turn

through

the

slit

without

crest.

The

pulse

of

light

which

photo

transistor

gets

is

transmitted

to

the

microcomputer,

and

the

pulse

of

light

is

sensed

as

the

size

or

the

non-existence

of

record

by

the

Microcomputer

(1C003).

Then

the

microcomputer

transmits

the

command-signal

of

speed

to

the

motor:

for

30cm

record

33-1/3

rpm,

for

17

cm

record

45

rpm,

for

no

record

no

rotation.

(B)

TRACKING

ERROR

CORRECTION

MECHANISM

The

tonearm

tracking

error

is

searched

by

the

Sensor

(PC201)

on

Phono

PWB

(67-1)

and

the

shutter

plate

mounted

to

the

tonearm.

The

sensitivity

of

the

sensor

has

been

adjusted

by

(VROO1).

No

tracking

error

point

has

been

settled

by

the

cor-

rect

positioning

of

phono

PWB

with

(VROQ2).

The

tracking

error,

if

occurs,

will

be

corrected

as

follows:

When

the

tracking

error

angle

is

created,

the

intensity

of

light

which

the

sensor

gets

will

be

varied.

The

variety

of

intensity

of

light

will

be

converted

to

the

current

which

flows

the

sensor.

The

degree

of

tracking

angle

is

almost

in

direct

proportion

to

the

current

near

0

degree

with

correct

adjustment

of

position-

ing.

The

current

will

be

converted

to

the

voltage

and

will

be

then

amplified

so

that

the

signal

amplified

starts

rotating

the

Servo-

controlled

Motor

(76).

The

rotation

of

the

motor

will

be

transmitted

to

the

Worm

Gear

(31)

by

the

Belt

(34).

The

Worm

Wheel

Gear

(35)

bited

the

worm

gear

will

roll

the

wire

so

that

the

Plate

Assy

(47)

on

which

the

tonearm

stands

will

be

moved.

When

the

tonearm

is

moved

to

the

position

where

the

tracking

error

angle

is

disappeared,

the

shutter

plate

will

obstruct

the

light

to

the

sensor.

The

current

will

become

lower,

the

voltage

will

become

lower

too,

and

then

servo-controlled

motor

will

stop

rotation.

3.

DISASSEMBLY

INSTRUCTIONS

(A)

TOOLS

REQUIRED

FOR

DISASSEMBLY

Phillips-head

screwdrivers:

for

M2

and

M3

Slotted-head

screwdrivers:

for

the

width

2.5~4

and

5~7.5

mm

(B)

REMOVE

CABINET

TOP

(1)

AS

FOLLOWS:

1.

In

case

that

the

tonearm

starts

moving

normally,

1-1.

Press

the

POWER

Button

(5)

so

that

the

power

will

be

switched

off,

and

remove

the

turntable

platter

and

mat

(Fig.

1).

Figure

1

1-2.

Place

the

turntable

upside

down

on

a

suitable

bench.

1-3.

Remove

the

seven

Screws

(207)

which

mount

the

Cabinet

bottom

(15)

(Fig.

2).

0?)

Red

screws

clamping

Qo)

y

plate

Assy

@)

&;

Cam

for

PITCH

ADJUSTMENT

OF

STYLUS

SETDOWN

POSITION

Figure

2

1-4.

Reverse

the

turntable.

1-5.

Remove

the

screw

(206)

which

mounts

the

Cover(10)

to

the

Cabinet

top

(1).

14.

Remove

the

Cover

(10)

from

the

Cabinet

top

by

drawing

it

(Fig.

3).

Press

the

POWER

button

so

that

the

power

will

be

1-7.

switched

on

and

remove

the

tonearm

to

the

position

—

3—

where

the

Cover

(10)

was

mounted,

pressing

the

START

button.

Press

the

POWER

button

to

switch

the

unit

off.

Remove

the

three

Screws

(207)

which

mount

the

Cabinet

top

(Fig.

4)

and

lift

the

Cabinet

top.

Figure

4

Fig

ure

3

2.

In

case

that

the

tonearm

does

not

start

moving

with

trouble,

2-1.

If

the

tonearm

is

above

or

on

the

turntable

platter,

turn

the

Pulley

(33)

counterclockwise

through

the

hole

referring

to

Fig.

5

with

the

slotted-head

screwdriver

(width

2.5

~

4mm)

until

tonearm

moves

to

its

rest

position.

2-2.

Remove

the

turntable

platter

and

mat.

2-3.

Follow

the

same

steps

as

described

above

1-2,

1-3,

1-4,

1-5

and

1-6.

2-4.

Move

the

tonearm

to

the

position

where

the

Cover

(10)

was

mounted,

turning

the

Pulley

(33)

clockwise

(Fig.

5).

2-5.

Follow

the

same

step

as

above

1-9.

NOTE:

If

the

tonearm

does

not

move

by

turning

the

Pulley

(33)

(Fig.

5),

an

additional

force

by

finger

should

be

added

to

the

bended

part

of

tonearm

in

the

desired

direction.

Figure

5

(C)

REMOVE

THE

PLATE

ASSY

(47)

AS

FOLLOWS:

1.

After

removing

the

cabinet

top,

remove

Position

PWB

Assy

(69)

referring

to

Fig.

6.

2.

Remove

the

Belt

(34)

between

Servo-controlled

Motor

(76)

and

Pulley

(33).

3.

Remove

the

Bearing

Assy

(30)

referring

to

Fig.

7.

Figure

6

Figure

7

4.

After

removing

the

Screw

(202)

described

in

Fig.

8,

remove

the

Plate

Assy

(47)

by

lifting

the

left

end

of

the

Pipe

(42).

(D)

REMOVE

THE

TONEARM

ASSY

(63)

AS

FOLLOWS:

1.

Unsolder

the

five

lead-wires

on

Phono

PWB

Assy

(67)

coming

from

tonearm.

2.

Remove

the

Phono

PWB

Assy

which

is

mounted

to

the

Plate

Assy

(47)

by

two

Screws,

(203)

and

(205)

(Fig.

9).

3.

Remove

the

Hexagon

Nut

(217)

and

Spring

Washer

(216)

to

remove

the

Tonearm

assy

(Fig.

8).

NOTE:

When

the

Phono

PWB

Assy

(67)

is

mounted,

make

sure

to

refer

to

“NO

TRACKING

ERROR”

adjustment

(ADJUSTMENT

D,

page

6).

Ss)

]

é)

rr

(@)

Figure

9

(E)

REMOVE

THE

SWITCH

(79)

ON

THE

PLATE

ASSY

(47)

AS

FOLLOWS:

1.

Remove

the

E

type

Washer

(220)

2

on

Plate

Assy

(47).

2.

Remove

the

Washer

(218)

and

Spring

(59).

3.

Remove

the

Lift

angle

Assy

(48).

-

4,

Remove

the

Screw

(200)

(Fig.

10).

Silicone

Grease

(G501)

Figure

10

(F)

REMOVE

THE

WORM

GEARS,

(31)

AND

(54),

AS

1.

FOLLOWS:

Worm

gears

have

been

press-insert

mounted.

When

worm

gears

are

lifted,

make

sure

to

apply

an

equal

force

to

each

connecting

parts

(Fig.

11).

2.

To

lift

the

Worm

Gear

(54)

remove

the

two

Screws

(222).

Silicone

Grease

(G501)

Figure

11

4.

REPLACING

AND

REASSEMBLY

INSTRUCTIONS

(A)

REPLACE

THE

WIRE

ASSY

(38)

AS

FOLLOWS:

1.

2.

Prior

to

mounting,

Wire

Assy

(38)

should

be

rolled

two

turns

by

Wheel

(35)

(Fig.

12).

Place

the

Wheel

(35)

to

the

Shaft

(36),

and

rotate

the

wheel

clockwise

until

the

starting

point

of

the

wire

(slit

on

pulley)

comes

to

the

Point

A

(Fig.

13).

.

Rotate

the

Wheel

(35)

then

counterclockwise

until

the

point

A

comes

to

the

point

B.

This

position

will

correspond

to

the

most

left

possible

location

of

Plate

Assy

(47).

4.

Place

the

Guide

(38-2)

to

the

depressed

part

on

Cabinet

bottom

(Fig.

12).

Figure

12

Figure

13

(B)

REPLACE

THE

CAM

(60)

WITH

FOLLOWING

CAUTION:

When

Cam

(60)

is

replaced,

make

sure

that

the

depressed

part

on

the

cam

should

be

mounted

facing

with

the

Tonearm

(63)

(Fig.

14).

Figure

14

(C)

REASSEMBLY

THE

WORM

GEAR

ASSYS,

(31)

AND

(54),

WITH

FOLLOWING

CAUTIONS:

1.

Worm

gear

(54)

Assy

Pressing

insert

the

Pulley

(55)

to

the

Worm

Gear

(54)

so

that

the

left

end

of

the

worm

gear

will

be

on

the

same

level

as

the

face

of

the

smaller

circle

in

the

pulley

(Fig.

15).

Figure

15

2.

Worm

gear

(31)

Assy

As

described

in

Fig.

16

pressing

insert

the

Shifter

(32)

and

pulley

to

the

long

and

short

bars

of

Worm

Gear

(31)

respec-

tively.

When

the

Encorder

(32)

is

assembled,

make

sure

that

the

left

end

of

the

bar

is

on

the

same

level

as

the

face

of

the

shorter

boss

of

shifter.

When

the

Pulley

(33)

is

assembled,

press

the

pulley

as

long

as

it

goes.

Figure

16

(D)

REASSEMBLY

THE

MOTORS,

(75)

AND

(76),

WITH

THE

FOLLOWING

CAUTIONS:

1.

When

the

Pulley

(61

or

62)

is

mounted

to

the

Motor

(75

or

76),

make

sure

to

have

the

specified

clearance

between

the

pulley

and

the

motor

referring

to

Fig.

17

and

Fig.

18.

2.

After

mounting

the

pulley,

apply

quick-dry

adhesive

agent.

We

recommend

“NEJI-LOCK

SUPER,

1324B”

for

this

assembly.

(E)

To

REASSEMBLE,

use

DISASSEMBLY

INSTRUCTIONS

in

reverse.

3

=

Ee

~

fy

Figure

17

Figure

18

5.

ADJUSTMENTS

(A)

STYLUS

POINT

HEIGHT

1.

Remove

the

Cabinet

top

according

to

DISASSEMBLY

IN-

STRUCTIONS

(B)

(page

3).

2.

Turn

the

Screw

(53)

described

in

Fig.

19

so

that

the

clear-

ance

between

stylus

and

turntable

platter

will

be

within

8

~

10

mm

when

the

tonearm

is

in

up

position

(Fig,

20).

8~

10mm

Figure

19

Figure

20

(B)

TONEARM

SETUP

POSITION

1.

Remove

the

Cabinet

top

according

to

DISASSEMBLY

IN-

STRUCTIONS

(B)

(page

3

).

2.

Turn

the

Screw

(50)

described

in

Fig.

21

so

that

the

tonearm

will

be

mounted

at

right

angles

with

its

moving

direction

(Fig.

22).

3.

After

this

adjustment,

make

sure

to

apply

"NO

TRACK-

ING

ERROR”

adjustment

(ADJUSTMENT

D,

page

6

).

Figure

21

Figure

22

(C)

TRACKING

SENSOR

SENSITIVITY

This

adjustment

is

subject

to

rectifying

the

uneven

sensitivity

of

Photo

Interrupter

(PC201)

on

the

Phono

PWB

Assy

(67).

NOTE:

This

adjustment

has

to

be

done

without

any

direct

sun

shine

nor

any

strong

light.

1.

Remove

the

Cabinet

top

according

to

DISASSEMBLY

IN-

STRUCTIONS

(B)

(page

3

).

|

2.

Press

the

POWER

button

so

that

the

unit

will

be

switched

on.

3.

Connect

the

D.C.

voltmeter

between

TP1

and

GND

ter-

minals

on

Control

PWB

Assy

(65)

(Fig.

23).

[

DC

Volt

Meter

nary

Control

PWB

Assy

SH]

©

f

Figure

23

4.

Slightly

loosen

the

two

Screws,

(203)

and

(205),

which

fasten

the

Phono

PWB

Assy

(67).

(Fig.

24).

5.

Turn

the

adjusting

boss

counterclockwise

with

the

screw-

driver

(Fig.

24).

fo

Shutter

plate

PU

Figure

24

Adjusting

boss

6.

Turn

the

Phono

PWB

Assy

clockwise

by

approximately

5°

with

the

screw

A

as

a

center

(Fig.

25).

Figure

25

7.

Make

sure

that

the

sensor

gets

enough

light

not

being

ob-

stracted

by

shutter

plate.

8.

Turn

the

Variable

Resistor

(VROO1)

with

a

small

size

slotted-

head

screwdriver

so

that

the

voltmeter

shows

-3.9

~

-4.1

volts.

9.

After

the

above

adjustment,

make

sure

to

apply

‘’NO

TRACKING

ERROR”

and

“STYLUS

SET-DOWN

POSI-

TION’’

adjustments

(ADJUSTMENTS

D

AND

€E,

page

6

and

7).

(D)

NO

TRACKING

ERROR

NOTE:

This

adjustment

has

to

be

done

without

any

direct

sun

shine

nor

any

strong

light.

1.

Remove

the

Cabinet

top

according

to

DISASSEMBLY

IN-

STRUCTIONS

(B)

(page

3

).

2.

Press

the

POWER

button

so

that

the

unit

will

be

switched

on.

|

—

§

—

3.

Connect

the

D.C.

voltmeter

between

TP1

and

GND

ter-

minals

on

Control

PWB

Assy

(65)

(Fig.

23).

4.

Slightly

loosen

the

two

Screws,

(203)

and

(205),

which

fasten

the

Phono

PWB

Assy

(Fig.

24).

5.

Turn

the

adjusting

boss

with

a

screwdriver

so

that

the

volt-

meter

shows

-1.6

~

-2.0

volts.

6.

Disconnect

the

D.C.

voltmeter

and

re-connect

it

between

TP2

and

GND

terminals

on

Control

PWB

Assy

(Fig.

26).

Control

PWB

Assy

—

repeat

Gye

Start

Figure

26

stop

7.

Without

placing

the

turntable

platter,

press

the

START

button

so

that

the

tonearm

starts

moving.

8

Press

the

CUE

button

so

that

the

tonearm

lifts

after

stylus

set-down.

9.

Turn

the

Variable

Resistor

(VROO2)

with

a

screwdriver

so

that

the

voltmeter

shows

-1.9

~-2.1

volts.

10.

Press

the

CUEING

button

so

that

the

tonearm

descends

and

press

the

STOP

button

for

tonearm

return

to

its

rest.

11.

After

above

adjustment,

make

sure

to

apply

“STYLUS

SET-DOWN”

adjustment

(ADJUSTMENT

E,

page

7

).

(E)

STYLUS

SET-DOWN

POSITION

1.

Remove

the

Cabinet

top

according

to

DISASSEMBLY

IN-

STRUCTIONS

(B)

(page

3).

2.

Press

the

POWER

button

so

that

the

unit

will

be

switched

on.

3.

Place

the

turntable

platter

and

mat.

4.

Use

the

first

face

of

NEC

test

record

ES-1008

for

this

adjustment.

Press

the

START

button;

turntable

starts

rotation,

the

tonearm

will

move

and

descend

onto

a

record.

5.

Turn

the

adjusting

described

in

Fig.

27

so

that

the

stylus

set-down

position

will

be

counted

between

15

and

17

points.

6.

Using

the

second

face

of

the

test

record

ES-1008

make

sure

that

the

automatic

return

position

will

be

counted

between

19

and

22

points.

NOTE:

After

the

above

steps,

no

adjustment

for

17

cm

records

is

required.

However,

to

settle

the

speci-

fied

counting

position

by

the

first

time

adjustment

may

be

difficult.

Apply

several

times

adjustments

to

confirm

the

above

specified

position.

(F)

PITCH

ADJUSTMENT

OF

STYLUS

SET-DOWN

POSITION

After

fundamental

adjustment

mentioned

above

(E),

pitch

adjustment

of

stylus

set-down

position

is

available

without

removing

the

Cabinet

top.

ee]

.

Place

the

unit

upside

down

on

a

suitable

bench.

2.

Stylus

set-down

position

can

be

adjusted

by

rotating

the

cam

through

the

hole

which

is

marked

in

Fig.

2

with

a

slotted-

head

screwdriver.

.

3.

Counterclockwise

turn

moves

the

set-down

position

inward;

clockwise

turn

moves

the

set-down

position

outward.

Plate

PU

Assy

Adjusting

rm

/

Figure

27

6.

TROUBLESHOOTING

(A)

THE

STROBE

LIGHT

DOES

NOT

TURN

ON

Measure

the

voltage

between

4

and

5

terminals

on

Power

PWB

Assy

(70)

with

A.C.

voltmeter.

*

Local

voltage

is

supplied:

(R501),

Neon

Lamp

(71-2)

or

Lead-wire

is

defective.

*

Different

voltage

from

local

one

or

no

voltage

is

supplied:

Power

Cord

(73),

Power

Switch

(SW501)

or

Fuse

(70-2)

is

defective.

(B)

THE

RECORD

SIZE

SEARCHER

LIGHT

DOES

NOT

TURN

ON

Measure

the

voltage

between

GND

and

each

+9

volts

terminals,

(J10)

and

(J12),

on

Control

PWB

Assy

(65)

with

D.C.

volt-

meter.

*

Approx.

+9V

is

supplied:

Measure

the

voltage

between

1

and

2

terminals

on

Position

PWB

(69-1)

with

D.C.

volt-

meter

.

*

Approx.

18V

is

supplied:

Lamp

(78)

or

Lead-wire

is

defective.

*

Too

short

voltage

is

supplied:

Cord

Assy

6P

(69-2)

or

connector

is

defective.

*

Quite

different

voltage

from

+9V

is

supplied:

(Q001),

(Q002)

or

(Q003)

is

defective.

*

Quite

different

voltage

from

-9V

is

supplied:

(Q004),

(Q005)

or

(QO006)

is

defective.

(C)

THE

TURNTABLE

DOES

NOT

START

ROTATION

AFTER

PLACING

THE

RECORD

Check

to

see

that

the

base-voltage

at

(0019)

is

approx.

+9V

when

tonearm

returns

to

its

rest

upon

STOP

button

being

pressed,

and

the

voltage

is

lowered

by

approx.

0.6V

upon

START

button

being

pressed.

*

Yes:

(0033),

Cord

Assy

7P

(65-3)

or

Direct-drive

Motor

(77)

is

defective.

*

No:

(I1C0O03)

or

(R044)

is

defective.

(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.

7.

PACKING

MATERIALS

C.E.C. ST630 User manual

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