Pioneer QuartzPLL PL-540 Bedienungsanleitung

Andere Pioneer Drehscheibe Handbücher

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saan

sia

an

OH

c/Mlanual

Service

zPLL

DIRECT

DRIVE

STEREO

TURNTABLE

“te

ar

Qu

2

O

a

=

120V

only

120V

only

220V

and

240V

(switchable)

110V,

120V,

220V

and

240V

(switchable)

110V,

120V,

220V

and

240V

(switchable)

Canada

model

(without

cartridge)

U.S.A.

model

(without

cartridge)

Europe

or

Oceania

model

(without

cartridge)

General

export

model

(without

cartridge)

U.S.

Military

model

(within

cartridge)

@

This

service

manual

is

applicable

to

the

PL-540/KUT,

KCT.

For

servicing

of

the

other

types

OQ

PwNn

a

please

refer

to

the

additional

service

manuals.

CONTENTS

SPECIFICATION

i

o6

a

be

Bok

ae

we

wre

eed

area

3

PANEL

FACILITIES

AND

OPERATION

.....

4

.

DISASSEMBLY

.

2.5.0.5...

5

ccc

eee

ee

6

PARTS

LOCATION

................000.

7

.

MECHANISM

OPERATION

AND

ADJUSTMENT

5.1

Start

of

Performance

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

8

5.2

Auto-return

Detection

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

8

5.3.

Auto-return

Operation

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

9

5.4

Adjustment

.................0004.

9

.

CIRCUIT

DESCRIPTIONS

6.1

Block

Diagram

.................0..

11

6.2

Motor

Operation

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

13

6.3

Operation

of

the

PD1003

IC

(Oscillator

Stage)

.............2.00.

15

6.4

Operation

of

the

PA2004

IC

(Comparator

Control)

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

15

6.5

Operation

of

the

PA2005

IC

fOriVe

CORTON):

notes

ee

ae oe

ed

ees,

s

16

6.6

Trouble

Shooting

Chart

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

20

6.7.

Motor

Adjustments

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

22

7.

EXPLODED

VIEWS

DAN

GAOINOE

se

eo

ne

ais

oes

ES

8

Bee

23

Tak’.

“VONCBEMN

espn:

Sgn

os

OPS

ae

Sg

eee

Ge

24

1.3

-

Botton

Plate-../o-0

644.464

64

eon

es

25

7.4

D.D.

Motor(PXM-061)........0...0000.

26

TS

-

“Packing!

o5

8a

3h

eee

fee

eee

de

halt

27

.

SCHEMATIC

DIAGRAMS,

P.C.

BOARD

PATTERNS

AND

PARTS

LIST

8.1

Schematic

Diagram

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

29

8.2

P.C.

Board

Connection

Diagram

........

31

8.3.

Drive

control

Assembly

(PWG-016)

......

33

8.4

Oscillator

Assembly

(PWX-021).........

34

8.5

Power

Supply

Assembly

(PWR-042

KUT)

(PWR-040

KCT)

..

34

1.

SPECIFICATION

Motor

and

Turntable

Drive

SYStEM

«.

5s.

eee

ko

ae

eee

heen

Direct-drive

MOlOl

sone

Ge

onda

eee

See

Quartz

PLL

Hall

motor

Turntable

Platter.

.

.

320mm

diam.

aluminum

alloy

die-cast

Moment

of

Inertia.

....

280kg-cm?

(including

platter

mat)

Speeds:

a4

lak

Ducat

aot

tne

we

dae

s

33-1/3

and

45rpm

Wow

and

Flutter...........

Less

than

0.025%

(WRMS)

Signal-to-Noise

Ratio.

.......

More

than

73dB

(DIN-B)

(with

Pioneer

cartridge

model

PC-400)

Rotational

Characteristics

Build-up

Time

......

Within

120°

rotation

at

33-1/3rpm

Speed

Deviation

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

Less

than

0.002%

Speed

vs.

Load

Characteristics...

.

Stable

up

to

!50

grams

drag

load

Speed

Drift

.......

Less

than

0.00008%/h

at

33-1/3rpm

Less

than

0.00003%/degree

temp.

change

at

33-1/3rpm

Tonearm

TVDG

sae

ame

Se

OA

Static-balance

type,

S-shaped

pipe

arm

Effective

Arm

Length

.................0..

221mm

Overhand

o6

<4

eo

a

eee

a

PEEPS

Sse

15.5mm

Usable

Cartridge

Weight.......

4g

(min.)

to

10g

(max.)

Subfunctions

Auto-return

mechanism,

Quick

play

mechanism,

PL-540

Anti-skating

force

control

Stylus

pressure

direct-readout

counter

weight,

Cueing

device,

Strobe

light,

Free

stop

hinges

Semiconductors

MSs

Mh

oh

ete

BN

Uk

SOS

bode

Si

RACK

BRA

3

LV

aViSISUONSis

0.622

eS

2k

Mia

ew

Ee

Re

eee

a

3

OGG

eso.

Scr

acces

8d

9b

Soe

bE

ES

ee

ees

3

Aallelementse:

2

teen

Be

Oe

eee

es

oe

BG

ee

3

Accessories

PPeAdaDtet

satu

bossa

ete

oe

Ras

ake

Rah

a

|

SCO

WON

Y

GF

os

ici

svar

so:

co

oe

Gi

Gl

Grae

Gen

Bike

doe

ected

1

Cartridge

mounting

screws

...........000

000

ee

6

Cartridge

mounting

NNISh.

7.

«50+

Cast

ea

swioees

os

2

Cartridge

mounting

washers

...............00..

Z

Operating

INsSttuClIONS..

<<

o04-545.0

wo-se

uote

egw

S

|

Miscellaneous

Power

Requirements

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

AC

120V,

50,

60Hz

Power

Consumption

.....................04

8W

Dimensions

...........

440(W)

x

145(H)

x

365(D)

mm

17-15/16(W)

x

5-11/16(H)

x

14-3/8(D)in.

Weient:

date

ars,

wh

BE

eae

tees

10kg/22Ib

NOTE:

Specifications

and

design

subject

to

possible

modification

without

notice,

due

to

improvements.

2.

PANEL

FACILITIES

AND

OPERATION

CONNECTIONS

The

PL-540’s

phono

cables

and

ground

lead

are

attached

to

the

rear

panel

of

the

turntable.

The

phono

cable

with

the

white

plug

is

for

the

left

channel

and

the

one

with

the

red

plug

is

for

the

right

channel.

The

thin

wire

with

the

Y-shaped

connector

at

the

end

is

the

ground

lead.

This

should

be

firmly

connected

to

the

ground

terminal

on

the

amplifier.

The

way

in

which

the

phono

cables

are

attached

will

depend

on

the

type

of

cartridge

used.

Read

the

instruc-

tions

in

the

booklet

that

comes

with

the

cartridge

as

well

as

the

operating

instructions

of

the

amplifier,

and

connect

the

phono

cables

properly.

Finally,

plug

the

power

cord

into

the

AC

outlet.

Since

the

auto-return

mechanism

may

be

engaged

by

vibration

during

transportation,

confirm

its

operation

before

play.

Move

the

tonearm

over

to

near

the

center

shaft.

The

turn-

table

platter

begins

to

rotate

and

the

tonearm

returns

to

the

arm

rest.

If

the

tonearm

starts

to

move

in

the

direc-

tion

of

the

arm

rest

when

moved

manually,

do

not

forcibly

move

it

toward

the

center

shaft.

TONEARM

This

tonearm

is

designed

to

apply

the

correct

tracking

force

to

the

cartridge

and

to

keep

this

force

at

the

precise

level

for

faithful

tracking

of

the

record

grooves.

It

also

has

the

job

of

switching

the

power

on

to

the

turntable.

@

When

the

tonearm

is

moved

from

the

arm

rest

to

the

platter,

the

power

comes

on,

the

strobe

lamp

lights

up,

and

the

platter

rotates.

@

When

the

tonearm

is

returned

to

the

arm

rest,

the

power

to

the

turntable

is

cut

off,

the

strobe

light

goes

off,

and

the

platter

stops

rotating.

PLATTER/STROBOSCOPE

When

the

tonearm

is

moved

and

power

is

supplied

to

the

turntable,

the

platter

will

start

rotating

at

the

set

rotation

speed.

When

the

turntable

reaches

its

rated

speed,

the

markings

around

the

side

of

the

platter

which

constitute

the

strobo-

scope

and

which

are

illuminated

by

the

strobe

light

appear

to

stand

still,

indicating

that

the

rated

speed

has

been

reached.

PLATTER

MAT.

This

platter

mat

stabilizes

the

records

and

also

absorbs

external

vibration.

STROBE

LIGHT

This

light

comes

on

when

the

tonearm

moves

away

from

the

arm

rest

toward

the

platter.

It

irradiates

the

strobo-

scope

around

the

outside

of

the

platter.

Ground

terminal

AC

outlet

Phono

input

jacks

|

PHONO

Phono

cables

——

Power

cord

-~

EP

ADAPTOR

Place

this

over

the

center

shaft

when

you

want

to

play

a

record

which

has

a

large

EP-type

center

hole.

Saati

DUST

COVER

Keep

this

closed

unless

operating

the

controls

or

tonearm,

or

changing

over

records.

This

serves

to

keep

dust

from

adhering

to

the

records

during

record

play.

When

fully

opened

and

pulled

straight

up,

this

dust

cover

can

be

removed

from

the

cabinet.

ARM-ELEVATION

When

the

ARM-ELEVATION

lever

is

operated,

this

will

move

up

or

down.

Its

oil-damped

mechanism

and

spring

ensure

that

the

tonearm

is

raised

and

lowered

smoothly.

ANTI-SKATE

KNOB

This

knob

is

used

to

cancel

out

the

harmful

skating

force

which

is

generated

during

record

play.

.

For

further

details,

see

“ANTI-SKATING

ADJUST-

MENT.”

ARM-ELEVATION

LEVER

UP

(A):

When

this

lever

is

set

to

this

position,

the

tonearm

will

rise.

Set

it

to

UP

before

record

play

and

when

you

want

to

stop

record

play

while

a

track

is

being

played

or

when

you

want

to

change

over

to

a

different

track.

DOWN

(

¥

):

When

the

lever

is

set

to

this

position,

the

tonearm

will

be

lowered.

If

it

is

set

to

DOWN

for

record

play

the

tonearm

will

be

lowered

onto

the

surface

of

the

record,

and

play

will

begin.

“<

ry

or

alt

Z

ii

Q

“L

A!

ar

{

ad

ee

Arm-elevation

lever

SPEED

SELECT

SWITCH

45

0...

When

this

switch

is

depressed,

the

platter

will

rotate

at

45rpm.

Depress

for

playing

45rpm

records,

singles

or

EP’s.

Oe

acest

When

this

switch

is

set

to

the

released

position,

the

platter

will

rotate

at

33rpm.

Release

for

playing

33-1/3rpm

records

like

LP's.

ARM

REST

The

arm

rest

supports

the

tonearm.

As

illustrated

in

the

figure,

use

the

clamp

to

keep

the

tonearm

in

place

when

you

are

not

playing

records.

PL-540

OPERATION

ds

2.

gt

~l

Place

the

record

to

be

played

on

the

platter.

Set

the

SPEED

select

switch

to

the

speed

at

which

the

record

is

to

be

played.

.

Set

the

ARM-ELEVATION

lever

to

the

UP

&

position.

.

Remove

the

stylus

cover

and

release

the

arm

clamp.

.

Hold

the

headshell

by

the

finger

lift

and

move

the

stylus

across

the

record

to

the

track

you

want

played.

The

platter

will

begin

to

rotate.

.

Set

the

ARM-ELEVATION

lever

to

the

DOWN

Vv

position.

The

stylus

will

descend

slowly

to

the

record

and

play

will

begin.

.

Adjust

the

volume

and

tone

controls

on

the

amplifier

to

the

preferred

levels,

and

then

sit

back

and

enjoy

vour

record.

.

After

the

record

has

been

played,

the

auto-

return

mechanism

is

actuated

and

the

tonearm

returns

to

the

arm

rest.

At

the

same

time,

the

platter

stops

rotating

and

the

power

to

the

turntable

is

turned

off.

.

Secure

the

tonearm

to

the

arm

rest

with

the

clamp

and

attach

the

stylus

cover

to

protect

the

stylus.

OPERATION

PRECAUTIONS

Be

careful

not

to

make

the

turntable

vibrate

while

a

record

is

playing,

since

this

can

result

in

damage

to

the

stylus

and

record.

Place

only

one

record

at

a

time

on

the

platter.

If

two

or

more

records

are

stacked

on

the

platter,

the

stylus

will

not

make

proper

contact

with

the

grooves,

and

this

will

impair

the

quality

of

reproduction.

Do

not

disconnect

the

power

cord

while

the

stylus

is

still

in

a

record

groove

as

this

may

result

in

damage

to

the

stylus

and

record.

Never

obstruct

the

turntable

with

the

hand

while

it

is

rotating.

This

may

cause

damage.

Do

not

force

the

tonearm

closer

than

40mm

to

the

center

shaft

or

away

from

the

arm

rest.

If

this

distance

is

exceeded,

you

may

damage

the

internal

mechanisms

and

render

automatic

operation

ineffective.

3.

DISASSEMBLY

1.

TURNTABLE

DISASSEMBLY

PROCEDURES

Control

Panel

Disassemble

each

part

in

the

following

order.

1.

After

removing

the

turntable

platter,

undo

the

5

wood

screws,

and

take

off

the

cover.

2.

Undo

the

4

hexagonal

wood

screws.

3.

Undo

the

mechanical

base

mounting

screw.

4.

Disconnect

the

PU

cord

connector.

5.

Unscrew

the

control

panel

from

the

mechanical

base.

6.

Undo

the

push-type

switch.

7.

Disconnect

the

neon

lamp

tube.

8.

Undo

the

lamp

holder.

Tonearm

1.

Undo

2

screws

from

the

PU

base

plate.

2.

Disconnect

the

PU

leads

from

the

PU

base

plate.

3.

Loosen

the

PU

plate

screws,

and

then

remove

PU

plates

A

and

B

from

the

arm

assembly.

4,

Loosen

the

hexagonal

screw

securing

the

tone-

arm

to

the

stand

base,

and

then

remove

the

arm.

va

PU

plate

B

a,

4.

PARTS

LOCATION

Cam

unit

PYY-012

Power

transformer

PT

T-048

(KUT)

PTT-051

(KCT)

Power

supply

assembly

PWR-040

(KUT)

PWR-042

(KCT)

Rotor

assembly

PXT-262

PL-540

D.D

Motor

If

the

motor

is

to

be

removed.

only

remove

it

after

the

control

panel

has

been

removed.

1.

Disconnect

all

leads

connected

to

the

D.Dmotor

printed

circuit

board.

2.

Undo

the

motor

mounting

screws.

Main

weight

assembly

PXA-708

Tone

arm

assembly

PPD-572

Head

shell

assembly

PXA-693

Drive

control

assembly

PWG-016

5.

MECHANISM

OPERATION

5.1

START

OF

PERFORMANCE

1.

The

tonearm

is

moved

from

the

arm

rest

to

above

the

turntable.

2.

Lever

A,

connected

to

the

tonearm,

unlocks

lever

B,

and

the

microswitch

is

turned

ON

(Fig.

1).

3.

When

the

microswitch

is

turned

ON,

the

motor

is

started

and

the

turntable

begins

to

rotate.

Microswitch

LeverB

“NA

Fig.

1

5.2

AUTO-RETURN

DETECTION

1.

When

the

stylus

nears

the

center

shaft,

lever

A

contacts

lever

C

(Fig.

2).

Lever

A

Fig.

2

2.

Lever

C

pushes

plate

A

by

an

amount

directly

proportional

to

the

amount

of

movement

of

the

tonearm

(Fig.

3).

Fig.

3

AND

ADJUSTMENT

3.

Plate

B

atop

plate

A

is

moved

toward

gear

A

by

the

movement

of

plate

A.

4.

The

front

end

of

plate

B

moves

approximately

0.1mm

when

the

stylus

is

advanced

1mm

toward

the

center

shaft

by

one

revolution

of

the

record.

5.

The

tooth

of

gear

A

has

the

dimensional

dif-

ference

shown

in

Fig.

4-a.

6.

Plate

B

is

pushed

back

by

this

dimensional

dif-

ference

at

a

stylus

movement

of

within

1mm

per

revolution

of

the

record.

7.

When

the

stylus

enters

the

lead-out

groove

in

the

record

at

the

end

of

the

performance,

it

is

moved

4mm

toward

the

center

shaft

by

one

revolution

of

the

record.

8.

The

end

of

plate

B

contacts

the

tooth

of

gear

A

(Fig.

4-b).

9.

Gear

A

and

gear

B

are

engaged,

and

gear

B

is

turned

by

rotation

of

the

turntable.

Plate

B

Fig.

4-a

Plate

B

Fig.

4-b

5.3

AUTO-RETURN

OPERATION

1.

Gear

B

is

rotated

by

detection

of

auto-return.

2.

Lever

D

moves

along

the

groove

of

gear

B,

and

the

tone

arm

is

lifted

(Fig.

5).

f

Arm

lifted

Fig.

5

3.

Lever

A

is

pushed

and

the

tonearm

is

returned

to

the

arm

rest

by

lever

D

(Fig.

6).

Lever

A

Fig.

6

4.

When

gear

B

has

rotated

one

revolution,

lever

D

is

returned

to

its

original

position.

dD.

When

lever

D

has

returned

to

its

original

posi-

tion,

lever

B

is

pushed

by

lever

A

and

the

microswitch

is

turned

OFF

(Fig.

7).

6.

When

the

microswitch

is

turned

OFF,

the

motor

is

stopped,

and

the

turntable

also

stops.

Lever

B

Microswitch

“NG

Fig.

7

PL-540

5.4

ADJUSTMENT

5.4.1

Auto-return

Detection

Position

1.

Plate

B

contacts

the

tooth

of

gear

A,

the

turn-

table

is

rotated,

and

the

auto-retum

detector

is

reset.

Fig.

8

~

Adjust

the

adjusting

screw

so

that

plate

B

con-

tacts

the

tooth

of

gear

A

when

the

stylus

has

reached

a

point

62mm

from

the

center

shaft.

Remove

rubber

cap

Soins

Fig.

9

5.4.2

Microswitch

ON

Timing

1s

10

Adjust

at

the

adjusting

point

shown

in

Fig.10-b

so

that

lever

A

and

lever

B

become

as

shown

in

Fig.

10-a

when

the

tonearm

is

fastened

to

the

arm

rest.

.

Adjust

the

adjusting

screw

(Fig.

10-c)

so

that

lever

B

and

the

microswitch

are

positioned

as

shown

in

Fig.

10-c

when

the

tonearm

is

fastened

to

the

arm

rest.

Since

this

adjustment

will

adversely

effect

the

auto-return

detection

position,

the

auto-

return

detection

position

must

be

readjusted.

Fig.

10-a

vi

-

!

i

H

Microswitch

Fig.

10-c

PL-540

6.

CIRCUIT

DESCRIPTIONS

6.1

BLOCK

DIAGRAM

;

|

tL

Motor

Rotation

Ass‘y

|

5

Buffer

—

aie

Fy

amplifier

converter

Waveform

rectification

i

—————————

=

St

sieaake

¢.

Ce

Position

signal

Reverse

rotation

<5

; .

13

76

formation

prevention

O-A

O

33.6

45

1

Frequency

divider

selector

II

14

a

|

Forward/reverse

TB

i

—O

direction

Comparator

control

.

"

:

discriminator

A

18

;

}

ir8

30Vv

|

19

Quick-stop

timin

s)

;

Frequency

divider

Mal

OSG

7

Voltage

stabilizer

|

_

|

z

pei

i]

’

t

GD

Mt

13

Motor

Drive

Ass’y

fe

.

eee

a

eee

ene

ART

7

A

4

PA2005

Oscillator

Ass’y

3 2

Lio

PO1003

12

6.2

MOTOR

OPERATION

3.

When

the

unit

is

switched

on,

the

output

voltages

of

the

respective

Hall

elements

will

be

as

shown

in

Fig.

20-a,

page

12.

4,

The

Hall

element

output

is

applied

to

the

—

Position

Signal

Combination

Circuit

contained

-.

figuration.

For

detection

of

the

platter

posi-

in

IC

PA-2005

and

utilized

to

control

the

cur-

~

os

rent

flowing

to

the

motor

drive

coils.

a

3

Hall

elements

are

mounted

at

40°

inter-

Por

Ride

ceuile.

sce

pagan

“Dave

Om

it

9?

3.

As

the

motor

rotates,

these

Hall

elements

ro

generate

an

AC

voltage

dependent

upon

ee

5.

The

output

from

the

Hall

elements

undergoes

strength

and

direction

of

the

magnetic

flux.

waveform

formation

in

the

Position

Signal

4.

The

bottom

side

of

the

rotor

magnet

possesses

Combination

circuit.

The

resulting

waveforms

200

magnetic

poles.

As

these

rotate

above

the

g

ae

showin

ik

mee

mae

;

tch

th

speed

detection

plate,

an

AC

voltage

is

generated

;

ese

composite

signals

are

used

to

switc

:

which

serves

as

the

speed

detection

signal

drive

current

in

such

a

way

that

each

motor

_The

inner

surface

of

the

rotor

magnet

possesses

winding

receives

the

proper

current

to

p

olarize

6

magnetic

poles.

As

shown

in

Fig.13

these

are

the

magnetic

poles

for

north,

south,

or

OFP

In

tilted

by

22.0°

relative

to

the

vertical

axis.

He

COTreCW

Sequence:

1

Motor

Construction

1.

The

PXM-061

is

an

outer-rotor

brushless

DC

motor

with

6

poles

and

9

slots.

2.

Motor

windings

are

arranged

in

a

3-phase

Y

con-

Fig.

15-a

Fig.

15-e

or

In

actual

rotation,

this

happens

as

follows.

7.

As

the

pole

of

coil

La

becomes

a

south

pole,

that

of

Lg

becomes

north,

and

Leg,

neutral.

8.

Repulsion

between

the

S

pole

at

La

and

the

rotor

S

pole,

and

attraction

between

the

Lg

N

pole

and

the

rotor

S

pole

exert

a

propulsive

force

on

the

rotor.

.

9.

As

the

rotor

turns

through

20°

of

arc,

the

Fig.

15-b

Fig.

15-f

output

from

the

Hall

elements

changes.

10.

Lg

now

enters

OFF

state,

Le

becomes

a

N

pole,

and

L,

aS

pole.

Speed

Detection

Plate

Hall

Element

11.

The

Le

N

pole

now

attracts

the

rotor

S

pole,

Fig.

12

and

the

La

S

pole

attracts

the

rotor

N

pole.

Rotation

continues.

12.

Correspondences

between

rotor

positions

and

coil

polarities

are

shown

in

Fig.

15,

a-f.

3.

Speed

Detection

Section

1.The

speed

detection

plate

has

one

rows

of

“detection

patterns.”’

2.

The

bottom

surface

of

the

rotor

is

magnetized

with

200

magnetic

poles,

and

these

rotate

at

a

short

distance

above

the

speed

detection

plate.

3.

The

output

voltage

from

the

detection

patterns

has

a

frequency

of

55.5Hz

at

33-1/3

rpm,

and

of

75Hz

at

45

rpm.

S

>

Fig.

15-c

4.

The

signal

is

supplied

to

IC

PA2004.

Fig.

13

2.

Principle

of

Motor

Rotation

1.

Let

us

assume

that

the

motor

is

at

standstill,

in

the

position

shown

in

Fig.

3.

2.

In

this

position,

Hall

element

Ha

is

located

next

to

a

borderline

between

south

and

north

poles,

Hg

next

to

a

south

pole,

and

H¢

next

to

Fig.

15-d

@

rortlh,

pole.

Fig.

14

6.3

OPERATION

OF

THE

PD1003

IC

(OSCILLATOR

STAGE)

_

Once

the

power

supply

is

turned

on,

the

quartz

crystal

oscillator

generates

a

6144kHz

signal.

The

frequency

of

this

signal

is

reduced

to

1.5kHz

(1/4096

division)

by

frequency

divider

I.

Part

of

the

resultant

signal

is

passed

via

the

x’tal/RC

switching

circuit

and

applied

to

frequency

divider

II.

The

other

part

of

the

signal

is

applied

to

frequency

divider

selector

II.

.The

1.5kHz

signal

applied

to

frequency

divider

Il

is

further

divided

into

a

750Hz

signal,

and

applied

to

frequency

divider

selector

I

where

the

signals

are

converted

into

sampling

pulses

for

phase

comparison

purposes

in

PA2004.

33rpm

=—s-_

27.78

Hz

45rpm

=:

387.5

Hz

(In

both

cases,

the

pulse

width

is

0.667ms).

.

Frequency

divider

selector

II

converts

signals

from

frequency

divider

I

into

pulse

signals

for

the

stroboscope

lamp

drive

circuit.

33rpm

=

555.5Hz

45rpm_~==75.0Hz

(In

both

cases,

the

pulse

width

is

again

0.667ms).

6.4

OPERATION

OF

THE

PA2004

IC

(COMPARATOR

CONTROL)

.

Signals

from

the

frequency

generator

in

the

motor

rotation

ass’y

are

changed

into

50%

duty

square

wave

signals

by

the

waveform

rectifier.

The

frequencies

at

this

stage

are

thus,

338rpm

=—s«555.5

5

Hz

45rpm

=

75Hz

.

Part

of

the

output

is

divided

by

%

in

the

FF

circuit,

and

subsequently

applied

to

the

FV

converter

circuit

along

with

the

other

part

of

the

output

formed

in

step

1

above,

thereby

forming

the

FV

converter

gate

pulse

signals.

.

The

output

from

the

FV

converter

is

applied

to

buffer

amplifiers

I

and

II.

.

The

buffer

amplifier

I

output

is

compared

with

the

reference

voltage

in

buffer

amplifier

III,

and

then

applied

to

the

output

compose

circuit.

.

Phase

comparison

of

the

sampling

pulses

from

the

PD1003

IC

with

the

FV

converter

output

occurs

in

buffer

amplifier

II,

with

the

resultant

output

being

applied

to

buffer

amplifier

IV.

.

The

output

from

buffer

amplifier

IV

is

also

applied

to

the

output

compose

circuit.

.

This

output

compose

circuit

consists

of

a

low-

pass

filter

(cut-off

frequency

23Hz,

cut-off

slope

—6dB/oct.)

which

serves

to

eliminate

the

carrier

component

in

the

output

of

buffer

amplifier

II

(phase

comparison).

.

This

final

output

signal

is

then

passed

onto

the

comparator

control

stage

of

the

PA2005

IC

for

comparison

with

the

reference

voltage.

6.5

OPERATION

OF

THE

PA2005

IC

(DRIVE

CONTROL)

e

Stroboscope

Pulse

Circuit

Me

The

platter

has

only

a

single

row

of

stroboscopic

markings.

Switchover

for

45

and

33

rpm

is

ef-

fected

by

changing

the

frequency

of

the

pulse

to

the

stroboscopic

lamp.

.From

the

Frequency

Divider

Selector

I,

a

fre-

quency

of

either

75Hz

(for

45

rpm,

representing

1/80

of

6000Hz)

or

55.5Hz

(for

33

rpm,

repre-

senting

1/108)

is

obtained

and

supplied

to

the

transistor

that

drives

the

stroboscopic

lamp.

@

Reverse

Rotation

Prevention

.

PXM-061

operates

indiscriminately

in

regard

to

the

direction

of

rotation.

If

the

platter

is

turned

slowly

in

the

reverse

direction

by

hand,

a

for-

ward

torque

will

be

applied

until

the

platter

stops,

reverses

its

rotation

and

reaches

rated

speed

in

the

proper

direction.

.

If,

however,

the

rotational

speed

in

the

reverse

direction

is

in

excess

of

33

or

45

rpm,

the

Forward/Reverse

Command

Block

may

‘“mis-

read”

this

as

simply

excessive

speed

(“‘overrun’”’)

and

apply

a

reverse

torque

until

rated

speed

is

attained.

.

This

reverse

torque

will

further

accelerate

the

turntable

rotation

in

the

reverse

direction.

This

is

known

as

‘“‘reverse

run-away.”’

.To

prevent

this

from

happening,

a

Reverse

Rotation

Prevention

circuit

has

been

included.

_This

Reverse

Rotation

Prevention

circuit

con-

sists

of

two

flip-flops

and

AND

gates

See

Fig.

12.

.The

input

for

this

circuit

is

derived

from

the

Hall

element

position

detection

signals

processed

in

the

Reverse

Rotation

Prevention

circuit.

.

As

long

as

the

platter

is

rotating

in

the

proper

direction,

this

pulse

enters

in

the

order

B

—

A

—

C,

and

no

“reverse”?

command

is

generated.

_If,

however,

the

platter

rotates

in

the

reverse

direction,

the

pulse

order

becomes

A

—

B

—

C,

and

a

corrective

command

is

given

to

the

For-

ward/Reverse

Command

Circuit.

AND

©

Output

Forced

Forward

Rotation

at

0

output

Fig.

16

Truth

table

@

Comparator

Control

and

Forward/Reverse

Com-

1.

V18...

Voltage

at

pin

(18)

mand

Circuit

Two

inputs

are

supplied

to

the

Control

Com-

parator:

a)

a

4V

reference

voltage

from

the

volt-

age

stabilizer;

and

b)

the

output

from

the

active

filters,

which

serves

as

the

detection

signal.

_If

the

tumtable

rotates

faster

than

rated

speed,

the

detection

signal

is

higher

than

the

4V

reference.

.When

this

happens,

the

Comparator

Control

sends

a

command

to

the

Forward/Reverse

Com-

mand

Circuit,

telling

it

to

apply

a

reverse

torque

to

the

motor

to

slow

it

down.

.

Conversely,

if

turntable

rotation

is

below

rated

speed,

the

detection

signal

voltage

will

be

below

the

4V

reference.

.In

this

case,

the

Comparator

Control

indicates

to

the

Forward/Reverse

Command

Circuit

that

forward

torque

must

be

applied

to

the

motor

to

accelerate

it.

<

Si

Area

of

of

Area

of

&

Sy,

reverse

=

forward

xO

oy,

torque

6

torque

Oo

%

rs)

@

S

RS

I

Vv

e)

O

¢

Input

voltage

differential

between

pins

(18)

and

(19)

V19...

Voltage

at

pin

(19)

Fig.

17

1€

®

Drive

Circuit

1.

The

signals

employed

in

the

switching

of

Q2

~

Q7

in

Fig.18

are

generated

by

3

Hall

elements,

and

applied

to

terminals

a,

b,

and

c

via

the

position

signal

formation

circuit.

2.

The

phase

of

these

step

waveform

Signals

is

displaced

by

120°

from

each

other.

3.

When

the

step

waveform

signals

at

position

I

in

Fig.

19-a

are

applied

to

the

drive

circuit

terminals

a,

b,

and

c,

the

potential

at

terminal

a

will

be

lowered,

resulting

in

Q2

being

turned

on.

The

potential

at

terminal

b

will

be

raised,

resulting

in

Q6

being

turned

on,

but

the

potential

at

terminal

c

will

remain

at

the

reference

level

voltage

(the

bias

settings

for

Q4

and

Q7

have

been

designed

to

prevent

these

2

transistors

from

operating

when

a

reference

level

voltage

is

applied).

4.

Vcc

will

thus

be

applied

across

the

Q2

—

coil

La

—

coil

Lg

—

(2)

—

Q6

route,

thereby

pro-

ducing

an

S

polarity

in

La,

and

an

N

polarity

in

Lp.

Control

o

i

|

|

5.

Once

the

magnetic

filed

is

generated,

the

rotor

will

commence

to

rotate.

After

the

rotor

turns

through

20°,

the

signals

at

position

II

in

Fig.19-b

will

be

applied

to

terminals

a,

b,

and

c,

thereby

resulting

in

a

change

in

the

flow

routes

of

the

drive

currents.

After

the

rotor

turns

through

another

20°,

the

signals

shown

at

position

III

in

Fig.

19-c

will

be

applied,

again

resulting

in

changes

in

flow

routes

of

the

drive

currents.

For

every

20°

that

the

rotor

turns

through,

the

flow

routes

for

the

drive

currents

will

change

as

shown

in

Figs.

19-d,

19-e,

and

19-f,

finally

returning

to

the

routes

shown

in

Fig.19-a

again.

6.

A

control

voltage

generated

by

the

forward/

reverse

direction

discriminator

indicator

circuit

is

applied

to

the

control

input

terminal,

thereby

controlling

the

flow

of

current

in

the

coils.

)

mv)

{

a

o—

|

=

seleak

b

0-

x

:

Fig.

18

Rss:

Fig.

19-a

ICC

!

a

eee

QO

ok.

:

|

|

2

=O

We

|)

“sa,

ag

Saat

nit

pa

Dh

aa

=

4

4

7

oo

-«

Sharer:

,

Control

|

a

aio

ee

es

;

4

pk.

input

—

He

Se

GND

;

Fig.

19-b

wows

voc

Fig.

19-c

Controt

input

Fig.

19-f