Pioneer PL-55X User manual

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1

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STEREO

TURNTABLE

134-0>

<ART

.

SPECIFICATIONS

.

PARTS

AND

THEIR

FUNCTIONS...

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3

.

OPERATION

OF

MOTOR

AND

MECHANISM

CONTENTS

3.1

RASEOR

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5

3.2

Prior

to

Start

of

Playing

........-

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6

3.3

Return

Operation...

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7

3.4

Stopping

Under

Manual

.......

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eee

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8

.

ADJUSTMENT

4.1

Tonearm

Will

Not

Return

to

The

Arm

Rest

.....

0.

cee

eect

te

eee

eee

9

4.2

Tonearm

Returns

to

The

Arm

Rest

Before

The

Record

Finishes

..........+..5:

9

4.3

Tonearm

Return

Speed

Is

Incorrect

20...

cece

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tte

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tes

9

4.4

Tonearm

Stops

before

It

Reaches

The

Arm

Rest

.....

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eees

9

4.5

Tonearm

Hits

The

Inside

of

The

Arm

Rest.

1...

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et

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9

4.6

Tonearm

Bounds

in

The

Arm

Rest

.....

2.

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10

4.7

Arm

Elevator

Will

Not

Move

at

A

Correct

Speed

......

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eee

reece

ere

eens

10

48

Turntable

Will

Not

Turn

or

Stop...

cee

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teen

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eens

10

4.9

Adjustment

of

The

Shorting

Switch

Contacts

.......-

+.

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10

4.10

Adjustment

Procedure

.......

see eee

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ene

10

4.11.

Adjustment

of

Motor

Speed

and

Line

Voltage

Selector

f.0.4

5.2

eas

creed

ius

11

.

SCHEMATIC

DIAGRAMS

AND

P.C.

BOARD

PATTERN

5.1

Schematic

Diagrams

......

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12

5.2

Power

Supply

Circuit

Assembly

.

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.

EXPLODED

VIEW

6.1

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Main

Panel

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17

6.3

Auto

Return

Assembly

(PXA-056)

6.

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18

6.4

Speed

Selector

Assembly

(KXA-766)

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19

6.5

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21

6.7

Anti-Skating

Assembly

(KXB-216)

6...

ee

eee

et

ete

eee

tes

22

6.8

PU-Plate

Assembly

(PXA-065)

ow

eee

eee

eee

eens

22

6.9

Power

Supply

Circuit

Assembly

(KWR-033)

6

eee

eee

eee

ee

ee

23

6.10

Start

Lever

Assembly

(KXA-761)

oe

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23

6.11

Upper

Board

2.0...

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6.12

Under

Board

.....

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25

6.13

Packing

Method

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26

6.14

Accessory

Case...

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27

1.

SPECIFICATIONS

Motor

and

Turntable

Motor:

Brushless

DC

servo

motor

Turntable

Drive:

_

Direct-driven

Speed:

Two

speeds,

33-1/3,

45

rpm

Wow

and

Flutter:

0.05%

(WRMS)

or

less

S/N:

58dB

or

more

(in

case

of

using

Pioneer

cartridge

model

PC-50)

Turntable

Platter:

31cm

diam.

Aluminum-diecast

alloy

Tonearm

Tonearm

Type:

Static

balance,

S-shaped,

pipe

arm

Effective

arm

length:

221mm

Usable

Cartridge

Weight:

4g

(MIN)

to

14g

(MAX)

Overhang:

15.5mm

Subfunctions

Automatic

Return

Tonearm

System

Skating

Force

Canceler

Viscous-damped

arm

elevation

Plug-in

type

Light

Aluminum

Head

Shell

Dust

Cover

with

Free

Stop

Hinges

Wooden

Base

with

Anti-acoustic

Feed

back

Suspension

Strobolight

Accessories

Weight

Plate

(cartridge

weight

adjustable)

1

Cartridge

Mounting

Screws

10

Cartridge

Mounting

Nuts

2

Cartridge

Mounting

Washers

2

45

rpm

Record

Adaptor

1

Screwdriver

1

Sub

weight

1

Overhang

Gauge

1

Connection

Cord

1

Operating

Instructions

1

Miscellaneous

Power

Requirements:

AC

220V

50/60

Hz

Power

Consumption:

5.2W

(MAX)

Outer

Dimensions:

480(W)

x

410(D)

x

185(H)mm

18-7/8(W)

x

16-1/8(D)

x

7-5/16(H)

in.

Weight:

11.3

kg

24Ib

15

oz.

NOTE:

Specifications

and

the

design

subject

to

possible

modifi-

cation

without

notice

due

to

improvements.

2.

PARTS

AND

THEIR

FUNCTIONS

Stroboscope

———__—_---

—--

Refer

to

the

accompanying

illustration

for

positioning

of

the

strobo

in

respect

to

the

line

frequency

and

turntable

speed.

On

moving

the

function

lever

from

OFF

to

ON/UP

and

DOWN,

strobolight

is

lit.

STROBOSCOPE

STROBOLIGHT

Cartridge

Stylus

Cover

Bring

the

cartridge

stylus

cover

into

position

when

the

PL-55X

is

not

in

use

as

shown

in

the

accompanying

illustration.

45

rpm

Record

Adaptor

A

45

rpm

record

adaptor

is

supplied

in

the

accessory

group,

which

permits

45

rpm

EP

records

with

large

center

holes

to

be

played.

Function

Lever

At

ON/UP

The

turntable

is

driven.

In

moving

this

lever

from

DOWN

to

this

position,

the

tonearm

(stylus)

lifts

slowly

from

the

record

surface,

thereby

interrupting

operation.

At

DOWN

The

tonearm

is

brought

into

position

over

the

record.

_

Setting

the

lever

to

this

position

gently

lowers

the

stylus

onto

the

record.

Playing

starts

at

this

time.

At

OFF

Moving

the

lever

to

this

position

from

DOWN

causes

the

tonearm

to

lift

and

return

to

the

arm

rest.

Power

is

cut

off

and

the

turntable

stops.

NOTES:

1.

On

moving

the

function

lever

from

DOWN

to

OFF

pause

at

the

ON/UP

position

until

the

am

lifts

from

the

record.

Failure

to

do

so

may

allow

the

stylus

to

bounce

against

the

record

and

drag

acrossit.

2.

Also

once

you

have

moved

the

function

lever

to

DOWN

you

cannot

immediately

return

it

to

OFF

or

ON/UP.

3.

Wait

until

the

tonearm

has

floated

dytwn

on

the

record

and

begun

to

play.

Only

the

playing

may

be

interrupted.

—

Arm

Rest

The

arm

rest

supports

the

tonearm.

The

tonearm

should

always

sit

on

the

arm

rest

when

a

record

is

not

in

use.

Ordinarily,

the

arm

clamp

should

be

engaged

to

lock

the

tonearm

in

place

on

the

rest.

ARM

CLAMP

Fine

Speed

Adjustment

Knob

With

the

turntable

operating

at

33-1/3

or

45

rpm,

make

fine

speed

adjustment

while

observing

the

stroboscope.

Turning

the

knob

in

the

(+)

(clockwise)

direction

in-

creases

speed

while

turning

it

in

the

(—)

(counterclock-

wise)

direction

decreases

speed.

Marks

on

the

turntable

must

appear

to

“‘stand

still’

under

strobolight,

indicated

correct

speed.

2.

33-1/3

rpm

Ce

45

rpm

—

33-1/3

rpm

Speed

Switch

Push

this

switch

if

33-1/3

rpm

records

are

to

be

played.

—

45

rpm

Speed

Switch

Push

this

switch

for

45

rpm

operation.

ed

33-1/3

rpm

a

45

rpm

PL-55X

OPERATION

Operation

of

the

PL-55X

is

uncomplicated.

Use

the

following

procedure.

1.

Place

the

record

to

be

played

on

the

turntable.

2.

Move

the

cartridge

stylus

cover

out

of

position.

Release

the

arm

rest

clamp.

3.

Move

the

function

lever

from

the

OFF

position

to

the

ON/UP

position.

At

this

time,

the

turntable

begins

to

turn.

4,Push

the

speed

button

(33-1/3

or

45

rpm)

corresponding

to

the

speed

of

the

record

to

be

played.

5.

With

the

strobolight

on,

adjust

the

fine

speed

control

until

the

turntable

appears

to

“stand

still’.

Turning

this

control

in

the

(+)

direction

raises

the

speed,

while

turning

it

in

the

(—)

direction

decreases

the

speed.

6.

After

the

speed

has

been

set

to

the

proper

value,

carefully

move

the

tonearm

into

position

over

the

lead-in

record

grooves

to

be

played.

7.

Set

the

function

lever

to

DOWN.

The

tonearm

drops

gently

to

the

record

grooves

and

playing

begins.

8.

To

stop

playing

at

an

intermediate

point,

move

the

function

lever

to

the

ON/UP

position.

If

operation

is

to

be

suspended,

move

the

function

lever

to

the

OFF

position.

(This

action

returns

the

tonearm

to

the

arm

rest

and

stops

the

turntable).

9.

Upon

completion

of

playing,

the

tonearm

re-

turns

automatically

to

the

arm

rest

and

the

turntable

stops.

The

function

lever

returns

auto-

matically

to

the

OFF

position.

3.

OPERATION

OF

MOTOR

3.1

MOTOR

Construction

of

motor

control

for

the

PL-35X

is

depicted

in

Fig.

2.

1.

Applying

power

sets

the

oscillator

into

opera-

tion,

Output

of

this

circuit

passes

to

the

pole

position

detecting

circuit

(L1

~

L6).

.

Here,

assume

that

coupling

between

Lil

and

L4

is

the

tightest.

Voltage

induced

in

L+

is

rectified

and

applied

to

Q106/Q109

in

the

driver.

.Q109

in

turn

conducts

and

causes

current

to

flow

in

the

associated

drive

coil

(A-1).

The

rotor

moves

in

the

direction

shown

by

arrow

in

Fig.

1.

The

magnetic

pole

affixed

to

the

rotor

induces

a

voltage

proportional

to

rotor

movements,

in

the

sensing

coil

(A-4).

.

Voltage

induced

in

A-4

is

rectified

by

a

diode

in

the

speed

sensor

and

applied

to

Q103

in

the

control

stage.

This

point

is

also

fed

from

the

reference

voltage

generator

(voltage

Es)

through

a

fine

speed

control

pot.

.

Voltage

applied

to

the

base

of

Q103

in

the

control

stage

controls

current

that

flows

in

Q104.

.Q104

serves

as

a

constant

current

source

for

Q106

through

Q111

in

the

driver

and

therefore

controls

current

flow

in

the

drive

coils.

DETECTOR

AND

MECHANISM

Pole

Position

Detector

Fig,

1

shows

a

simplified

view

of

the

drive

4

sense

cous.

With

power

applied

and

coupling

between

Ll

and

L4

high,

Q1LO9

causes

current

to

flow

through

A-l.

Asa

result,

the

rotor

end

of

coil

A-1

becomes

a

south

pole

($1)

and

attracts

N1.

The

rotor

moves

in

the

direction

shown

by

arrow.

Coupling

factor

between

L2

and

LS

increases

and

Operation

of

Q110

causes

current

to

flow

in

coil

A-2.

Pole

$2

attracts

pole

N2

and

rotor

rotation

continues.

In

the

same

manner,

$3

attracts

Pole

N3.

Continuation

of

this

process

causes

the

rotor

to

turn

on

a

steady

basis.

e

and

ROTOR

DIRECTION

OF

ROTATION

POLE

POSITION

.

When

ambient

temperature

change

causes

driver

DETECTOR

Fig.

1

current

to

rise,

the

speed

of

rotation

increases

above

the

rated

value.

Q104

current

increases

and

Q106

~

Q111

currents

decrease.

As

a

result,

the

speed

of

rotation

falls

off.

CONTROL

STAGE

+8

33's9

O

Es

O

ty”

—

a5

9

:

Qroz

£

Qior

OSCILLATOR

REFERENCE

VOLTAGE

GENERATOR

Q

ye

Ce

|

09

cK)

ce

ia-1

G&S

a-a

Ley

Ss

—H—

g

Py

Maen

Soe]

(ESE

|_|

«)

.

la-3

M8

Sa-

|

Qios

Ns

3

wa

6

wen

Qui

a

=

Fig.

2

POLE

POSITION

DRIVER

DRIVE

SENSING

SPEED

SENSOR

COILS

COILS

3.2

PRIOR

TO

START

OF

PLAYING

1.

After

the

tonearm

has

been

swung

into

place

for

3.

Moving

the

FUNCTION

lever

to

the

DOWN

the

start

of

playing

of

the

record,

moving

the

position

turns

plate

(1)

still

further

through

link

FUNCTION

lever

to

the

ON/UP

position

causes

(1).

Pawl

(2)

engages

plastic

arm

(1).

plate

(1)

to

turn

through

connecting

link

(1)

to

4,

The

arm

elevator

riding

on

the

cam

portion

of

the

point

at

which

pawl

(1)

engages

plastic

arm

plate

(2)

drops,

lowering

the

tonearm

onto

the

(1).

record.

2.

Plate

(2)

turns

along

with

plate

(1),

through

5.

Pawl

(3)

of

plate

(2)

applies

pressure

to

plastic

action

of

interconnecting

spring

(1).

Upon

com-

arm

(2),

so

that

there

is

no

interference

to

pletion

of

this

action,

the

microswitch

actuator

motion

of

the

stop

required

for

automatic

is

released,

thereby

applying

power

to

the

phono

return

operation.

motor.

The

turntable

begins

to

revolve.

PLASTIC

ARM(1)

PLATE(1)

MICROSWITCH

ACTUATOR

LINK(1}

FUNCTION

LEVER

PIN

OF

PLASTIC

ARM

PLASTIC

ARM(2)

Fig.

3

No

interference

to

movement

of

plastic

(

arm.

anit

Cam

action

allows

tonearm

to

crop.

PLATE(2)

Fig.

4

3.3

RETURN

OPERATIONS

1.

When

the

tonearm

is

going

to

come

to

the

inside

(end)

of

the

record,

the

pick-up

lever

applies

pressure

to

the

aluminum

arm.

This

means

that

the

arm

is

coupled

indirectly

to

the

plastic

arm.

Resultant

action

causes

the

end

of

the

plastic

arm

to

swing

toward

the

center

of

the

turntable.

.

As

soon

as

the

tonearm

enters

the

return

groove

of

the

record,

the

pin

on

the

bottom

of

the

turntable

imparts

a

kick

to

the

plastic

arm.

_

Motion

of

the

plastic

arm

at

this

time

acts

on

plastic

arm

(1),

thereby

releasing

plate

(1).

Plastic

arm

(3)

then

locks

plastic

arm

(1).

This

action

closes

the

shorting

switch

so

that

noise

will

not

be

generated

as

the

tonearm

separates

from

the

record.

.

Plate

(1)

returns

through

action

of

spring

(2).

Plate

(2)

also

returns.

_

TURNTABLE

SH

Playing

operation.

Return

operation.

PLASTIC

-

—

|

PIN

i

kg

Es

ALUMINUM

Plastic

arm

does

not

Plastic

arm

kicked

ARM

move

during

normal

when

tonearm

enters

play.

return

groove.

PLASTIC

ARM

PLASTIC

ARM

PL-55X

_Return

of

plate

(1)

results

in

the

following

sequence.

Pressure

is

applied

to

plastic

arm

(1)

and

the

FUNCTION

lever

is

forced

back

to

the

OFF

position.

Action

of

link

(2)

returns

the

aluminum

arm

to

the

start

position.

.

Return

of

plate

(2)

results

in

the

following

sequence.

Action

at

the

cam

portion

of

plate

(2)

lifts

the

tonearm

from

the

record.

Plate

(3)

indirectly

coupled

to

plate

(2)

swings

the

tonearm

back

to

the

arm

rest.

Pressure

is

applied

to

the

microswitch

actuator,

opening

the

microswitch

contacts

and

stopping

the

phono

motor.

Pressure

applied.

es

oe

PICK-UP

LEVER

Pick-up

lever

and

tonearm

directly

Fig.

5

connected

by

shaft.

Cam

action

lifts

tomearm

PLASTIC

while

motion

of

PL_ATE(3)

ARM

(1)

PLATE(3)

swings

tonearm

tack

to

the

arm

rest.

SHORTING

SWITCH

Pawl

disengaged

when

PLATE

(2)

plastic

arm

kicks

plastic

arm(1).

MICROSWITCH

Microswitch

ACTUATOR

Fig.

6

3.4

STOPPING

UNDER

MANUAL

1.

Moving

the

FUNCTION

lever

to

the

ON/UP

position

causes

pawl

(1)

of

plate

(1)

to

engage

plastic

arm

(1).

Phono

motor

operation

begins.

.

Moving

the

FUNCTION

lever

to

the

OFF

position

causes

plastic

link

(4)

to

shift,

in

turn

desengaging

pawl

(2)

from

plastic

arm

(1).

.

Action

of

spring

(2)

returns

plate

(1).

As

a

result,

the

phono

motor

stops,

as

described

under

(6)

and

(7)

on

page

7.

.

Moving

the

FUNCTION

lever

to

the

DOWN

position

initiates

playback

of

the

record.

When

this

lever

is

moved

from

the

DOWN

to

the

OFF

position,

pawl

(2)

is

disengaged

from

plastic

arm

(1)

through

action

of

plastic

link

(4).

The

phono

motor

stops,

as

described

under

(4)

through

(7)

on

page

7.

PLASTIC

ARM(1)

DNs

PLASTIC

LINK(4)

PaWilal

ARM)

SHORTING

PNG

ee

awit)

PLATE(1)

PLASTIC

LINK(4)

Fig.

7

4.

ADJUSTMENTS

4.1

TONEARM

WILL

NOT

RETURN

TO

THE

ARM

REST

If

the

pin

at

the

back

of

the

turntable

is

not

(or

incorrectly)

engaged

with

the

plastic

arm

the

tonearm

will

not

return

to

the

arm

rest.

The

probable

causes

of

the

trouble

are

as

follows;

(a)

The

tip

of

the

plastic

arm

bends

downward.

(b)

The

pin

is

bent.

(c)

The

pick-up

lever

is

incorrectly

mounted.

In

case

(a)

or

(b)

is

responsible

for

the

trouble,

correct

the

curve

of

the

plastic

arm

or

the

bend

of

the

pin.

If

necessary;

replace

the

plastic

arm

as

the

case

may

be.

In

case

(c)

is

the

cause

of

the

trouble,

adjust

the

screw

provided

at

the

tip

of

the

pick-up

lever

so

that

the

pick-up

lever

will

push

the

aluminum

arm

when

the

head

of

the

tonearm

reaches

the

point

of

130¢

from

the

center

of

the

turntable

(Fig.

8).

4.2

TONEARM

RETURNS

TO

THE

ARM

REST

BEFORE

THE

RECORD

FINISHES

The

pick-up

lever

is

incorrectly

mounted.

The

best

solution

to

this

trouble

is

to

replace

the

plastic

arm.

This

trouble

also

occurs

when

the

plastic

arm

fails

to

move

smoothly.

Oil

the

automatic

return

mechanism.

4.3

TONEARM

RETURN

SPEED

IS

INCORRECT

If

the

return

speed

is

too

slow,

first

insure

that

the

cause

is

not

due

to

dirt.

Adjust

spring

(2)

tension

to

give

the

correct

spring,

increasing

tension

to

increase

speed

and

reducing

tension

to

decrease

speed

(Fig.

9).

m

turn

the

nuts.

>

i:

SPRING(2}

Fig.

9

PL-55xX

4.4

TONEARM

STOPS

BEFORE

IT

REACHES

THE

ARM

REST

This

trouble

occurs

when

the

plate

(1)

and

the

plate

(2)

fail

to

move

smoothly.

Oil

the

plate

(1)

and

plate

(2)

first

and

see

if

they

move

smoothly.

If

not,

replace

them.

4.5

TONEARM

HITS

THE

INSIDE

OF

THE

ARM

REST

See

if

the

head

of

the

tonearm

rises

5

~

10mm

off

the

turntable

with

the

FUNCTION

lever

set

to

OFF.

If

the

tonearm

rises

incorrectly,

adjust

the

height

of

the

arm

rest

by

means

of

the

screw

provided

on

the

arm

rest

base;

if

not,

adjust

the

height

of

the

elevator

rubber

by

means

of

the

adjust

screw

on

the

elevator

arm

shaft

(Figs.

10,

11).

|

UP

AND

DOWN

SCREW

ARM

REST

BASE

Fig.

10

Fig.

11