Pioneer PL-4 User manual

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Service

PAL

ETUIET

REPAIR

&

ADJUSTMENTS

ORDER

NO.

ART-709-0

STEREO

TURNTABLE

L.—<}

PL-320

MODEL

PL-4

COMES

IN

SEVEN

VERSIONS

DISTINGUISHED

AS

FOLLOWS:

Remarks

120V

only

U.S.A.

model

(Without

cartridge)

120V

only

Canada

model

(Without

cartridge)

220V

—

240V

Europe

model

220V

—

240V

United

kingdom

model

220V

—

240V

Oceania

model

110V—1

20V/220V—240V

(Switchable)

General

export

model

110V—120V/220V—240V

(Switchable)

U.S.

military

model

MODEL

PL-320

COMES

IN

FIVE

VERSIONS

DISTINGUISHED

AS

FOLLOWS:

Voltage

Remarks

220V

—

240V

Europe

model

220V

—

240V

United

kingdom

mode!

220V

—

240V

Oceania

model

110V—120V/220V—240V

(Switchable)

Generali

export

mode!

110V—1

20V/220V—240V

(Switchable)

U.S.

military

model

(Without

dust

cover)

=

This

is

the

service

manual

for

model

PL-4/KUT.

For

servicing

of

the

other

types,

please

refer

to

the

additional

service

manual.

®=

Ce

manuel

d’instruction

se

refére

au

mode

de

réglage,

en

frangais.

=

Este

manual

de

servicio

trata

del

método

de

ajuste

escrito

en

espajiol.

PIONEER

ELECTRONIC

CORPORATION

4-1.

Meguro

1-Chome,

Meguro-ku,

Tokyo

153,

Japan

U.S.

PIONEER

ELECTRONICS

CORPORATION

&5

Oxford

Drive,

Moonachie,

New

Jersey

07074,

U.S.A.

PIONEER

ELECTRONIC

(EUROPE)

N.V.

Luithagen-Haven

9,

2030

Antwerp,

Belgium

PIONEER

ELECTRONICS

AUSTRALIA

PTY.

LTD.

178-184

Boundary

Road,

Braeside,

Victoria

3195,

Australia

FU

©

APR.

1981

Printed

in

Japan

=

For

the

circuit

and

mechanism

descriptions,

please

refer

to

the

supplement

of

model

PL-7

service

manual

(ART-768).

CONTENTS

1.

SPECIFICATIONS

...........2

000s

eee

2

2.

FRONT

PANEL

FACILITIES..............

3

3.

DISASSEMBLY

...

0...

eee

ee

ee

eee eee

4

4,

TROUBLESHOOTING.

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

000

es

6

5.

PRECAUTIONS

FOR

REASSEMBLY........

10

6.

BLOCK

DIAGRAM..........

00ers

12

7.

P.C.

BOARDS

CONNECTION

DIAGRAM.....

13

1.

SPECIFICATIONS

Motor

and

Turntable

Drive

System

1.0...

eee

teen

eae

Direct-drive

IMG

BOF

sister,

ly

ecncte

te

cabin,

bes

gris

Sens

Dhansel

ROEUE,

Cate

Hen

eee

iets

DC

servo

motor

Turntable

Platter.

.........310mm

diam.

aluminum

alloy

die-cast.

SPECS

ye

865

suh

fisidanctivns

elhenttw

oem

Wamesianace6

Alea

33-1/3

and

45rpm

Wow

and

Flutter

.............02

000

Less

than

0.025%

(WRMS)

Signal-to-Noise

Ratio..............--.

More

than

78dB

(DIN-B)

(with

Pioneer

cartridge

model

PC-3MC)

Tonearm

TY

Dh

are

oes

Aucune

ee

ecole

Static-balance

type,

Straight

pipe

arm

Effective

Arm

Length

..........2--2

2200-2

eee

eee

221mm

Overhang:

escaped

acess

dow

ogc

Gee

ert

acs

ale

de

aa

15.5mm

Usable

Cartridge

Weight

........-.-..

3g

(min.)

to

8g

(max.)

Subfunctions

Auto-return

mechanism,

Anti-skating

force

control,

Stylus

pressure

direct-readout

counterweight,

Cueing

device,

Strobe

light,

Free

stop

hinges

Miscellaneous

Power

Requirements.

...........

00

0

ee

es

AC120V,

60Hz

Power

Consumption

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

0000

cece

OW

Dimensions

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

420(W)

X

108(H)

X

367(D)mm

16-1/2(W)

X

4-1/4(H)

X

14-7/16(D)in.

Weight

0

.'65

5.0.

Sg

iy

ee

vslare

A

gh

Bla

teen

plete

5.8kg/12

ib

12

oz

2

8.

SCHEMATIC

DIAGRAM...............-

15

9.

EXPLODED

VIEWS

.............-.00.0.

17

10.

ELECTRICAL

PARTS

LIST..............

22

11.

ADJUSTMENTS.

..........00.-

2002

eee

23

REGLAGE.

cal

tyies

cea

uae

naam

24

AIJUST

Eee

ie

GGA

Reh

Ae

eed

Ea

ee

25

12.:-PAGKING

cc

8d

4s

Saas

ore

whee

ee

26

Accessories

EP

Adapters

5.3.22

foes

Se

lense

ce ek

tee

ee

he

WS

Rte

SEN

ie

1

Operating

Instructions...

2...

...0.0.0.00.000.

000

eee

ee

1

NOTE:

Specifications

and

design

subject

to

possible

modification

without

notice,

due

to

improvements.

:

:

3

7

i

q

a

a

:

thigh

a

i

i

ir

aS

2.

FRONT

PANEL

FACILITIES

eS

®

eo

©

()

CUT

switch

Depress

this

switch

to

stop

play.

(2)

Speed

check

window

Look

through

this

window

and

observe

the

movement

of

the

striped

pattern

when

checking

the

rotational

speed

or

finely

adjusting

the

speed.

The

position

of

the

striped

pattern

differs

according

to

the

power

line

frequency

(50

Hz

or

60

Hz)

in

the

area

of

use

and

the

speed

(33

or

45

rpm)

of

the

platter.

Top

pattern:

For

45

rpm

in

50

Hz

area

Second

pattern:

For

45

rpm

in

60

Hz

area

Third

pattern:

For

33

rpm

in

50

Hz

area

Bottom

pattern:

For

33

rpm

in

60

Hz

area

(3)SPEED

ADJ

control

Rotate

this

control

in

order

to

finely

adjust

the

speed

of

the

platter.

The

speed

is

reduced

when

the

control

is

rotated

in

the

[-

]

direction.

The

speed

is

increased

when

the

control

is

rotated

in

the

[+]

direction.

(4)

SPEED

switch

Set

this

switch

in

accordance

with

the

speed

of

the

re-

cord

which

is

to

be

played.

[33]

(depressed

position):

[45]

(released

position):

©)

Cartridge

For

33-1/3

rpm

records

For

45

rpm

records

(6)

Headshell

@

Tonearm

(8)

ARM

ELEVATION

lever

Operate

this

lever

when

starting

record

play

or

when

temporarily

suspending

play.

@

ANTI-SKATE

control

This

is

rotated

when

performing

the

anti-skating

adjust-

ment.

Arm

rest

This

serves

to

hold

and

clamp

the

tonearm.

When

moving

the

tonearm,

release

the

clamp.

(})

Tracking

force

adjustment

weight

This

is

used

when

adjusting

the

tracking

force.

(2

Platter

(3)

Platter

mounting

shaft

Rubber

mat

(5)

EP

adapter

This

is

used

when

playing

records

without

a

‘‘middle.”’

(16

Cabinet

(7)

Dust

cover

3.

DISASSEMBLY

3.1

PANEL

AND

BASE

In

removing

the

panel,

follow

the

below

listed

steps

in

the

order

given.

Using

any

unnecessary

force

will

result

in

bending

the

springs

or

damaging

other

parts.

Panel

removal

steps

1.

Remove

the

headshell

and

weight

assembly,

and

the

weight

shaft

assembly.

The

weight

shaft

assembly

is

removed

by

loosening

screw

(Hexagone

socket

screw)

and

the

headshell

by

loosening

screw

@

.

2.

Lift

off

the

turntable

platter.

Turntable

platter

3.

AD

oP

Panel

Motor

—

assembly

|

|=

Ae

|

omen

EN

Base

Dust

cover

Loosen

insulator

attachment

screws

@

and

remove

the

insulator.

(Do

not

mix

the

color-

coded

float

springs.

They

must

be

replaced

with

their

original

insulators

during

reassemb-

ly.)

.

Remove

the

rear

panel

PU

cord

strain

relief.

-

Unplug

the

2P

and

5P

connectors.

.

Completely

remove

the

PU

cord

from

the

panel.

Lift

up

the

headshell

end

of

the

tonearm,

and

taking

care

not

to

damage

the

tonearm,

remove

it

from

the

panel.

(Hold

the

tonearm

steady.)

Weight

assembly

Screw

8

Rubber

bush

Control

mechanism

assembly

Insulator

z

Fig.

3-1

Disassembly

3.2

D.D

MOTOR

ASSEMBLY

After

the

panel

has

been

removed,

loosen

the

three

motor

attachment

screws

@

and

remove

the

motor.

3.3

TONEARM

SECTION

Remove

the

tonearm

section

by

taking

out

the

three

arm

base

attachment

screws

@

and

one

ground

wire

securing

screw@.

3.4

CONTROL

MECHANISM

SECTION

After

the

tonearm

section

has

been

removed,

loosen

the

three

control

mechanism

attachment

screws

@and

remove

the

assembly.

Tonearm

PU

plate

Fig.

3-3

Remove

tonearm

3.5

TONEARM

1.

Disconnect

the

tonearm

lead

wires

from

the

PU

board

(See

Fig.

3-2).

Note

that

some

of

the

lead

wires

have

been

soldered

to

the

PU

board,

and

must

be

discon-

nected

with

care.

2.

Loosen

the

set

screw

@

with

a

screwdriver

to

remove

the

PU

plate

under

the

arm

base

(See

Fig.

3-3).

8.

Undo

the

screw

@

securing

the

tonearm

to

the

arm

base

(See

Fig.

3-3).

Tonearm

lead

wires

PU

board

Red

Fig.

3-2

Disconnect

the

tonearm

lead

wires

(Hexagone

socket

screw)

Arm

base

4.

TROUBLESHOOTING

Use

the

following

directions

to

find

the

cause

of

each

type

of

breakdown.

Improperly

adjustment

units

should

be

completely

readjusted.

«

AUTO-RETURN

DOES

NOT

WORK

Change

in

starting

position

adjust-

ment.

Starting

plate

does

not

follow

the

NO

Too

much

grease

between

the

signal

signal

plate.

plate

and

the

cam

YES

YES

Inner

diameter

of

the

starting

plate

hole

is

small.

Protrusions

on

the

caulk

section

of

the

starting

plate

hole.

Not

enough

grease

between

the

starting

plate

and

signal

plate.

After

starting,

incomplete

reset

of

the

NO

The

curved

section

of

the

signal

signal

plate.

(See

Section

1)

plate

is

deformed.

YES

Arm

lead

wire

is

caught

on

something.

PU

cord

is

touching

the

PU

plate.

The

inner

areas

of

records

can

not

be

tracked.

Operator

of

the

detection

lever

is

not

smooth.

Looseness

in

the

PU

plate

attach-

ment.

Section

1

After

performing

the

return

operation,

if

the

curved

section

of

the

signal

plate

and

curved

sect-

ion

of

the

starting

plate

are

not

in

contact

with

surfaces

A)

and

respectively

of

the

cam,

reset

will

be

incomplete

and

the

starting

position

will

be

late.

As

a

result,

the

return

function

may

not

operate

at

times.

In

this

case,

bend

the

signal

plate

©)so

that

dimension

(A)

is

0.5mm

or

larger.

Cam

Fig.

4-1

Incomplete

reset

of

starting

and

signal

plates.

Starting

plate

:

At

least

0.5mm

0

see

ee

IS

it

Bae

Lay

ot

a

a

=»

RETURN

IS

FAST

(RETURN

AT

1mm

PITCH)

Protrusions

on

the

pinion

gear

section

(See

section

2)

Section

2

Pinion

gear

If

there

are

rough

areas

of

plastic

protruding

Protruding

section

from

the

(A)

section

of

the

protruding

section

of

the

pinion

gear,

the

return

function

may

operate

at

a

pitch

of

only

1mm.

In

this

case,

remove

the

Fig.

4-2

Elimination

of

pinion

gear

protrusions

plastic

protrusions

completely

(Fig.

4-2)

»

MOTOR

DOES

NOT

ROTATE

2P

and

5P

connectors

are

not

attach-

ed.

YES

Connector(s)

is

not

properly

installed.

=

MOTOR

DOES

NOT

STOP

The

switch

lever

and

switch

locker

No

The

installation

location

of

the

PU

are

not

locking

(See

section

3)

plate

is

incorrect.

Section

3

|

PU

plate

In

order

to

turn

the

power

OFF,

the

PU

plate

shaft

touches

surface

®

of

the

switch

locker

pushing

it

over

so

it

locks

with

the

switch

lever

turning

the

microswitch

OFF

(Fig.

4-3).

If

the

amount

of

push

on

the

switch

locker

is

insuf-

ficient,

it

can

not

lock

with

the

switch

lever.

With

the

tonearm

locked

in

the

arm

rest,

as

shown

Switch

lever

|

in

figure

4-4,

attach

the

PU

plate

precisely

mid-

Mads

rel

Peers

Gr

switch

Iocker

way

between

the

first

and

second

points

from

the

arm

base

scale

mark

counting

away

from

you.

Pte:

Arm

base

scale

mark

Fig.

4-4

Adjustment

PU

plate

«

MOTOR

ASSEMBLY

NOTE:

The

IC

PA2008

used

in

the

PXM-090

does

not

have

a

dedicated

ground

pin

for

its

internal

circuitry,

but

uses

the

thermal

fan

ground.

When

replacing

the

IC,

make

sure

the

securing

screws

retaining

the

ground

line

between

the

IC

and

thermal

dissipator

and

between

the

thermal

dissipator

and

motor

base,

and

base

to

circuit

board

is

securely

tightened.

e

Motor

Does

not

Turn

are

Component

connected

to

Is

Vee

1

29

volts?

Me

rh

supply

circus

detec:

PA2008

terminal

4

defec-

YES

:

tive.

LA

ane

eae

term

NG

PA2008

defective.

NO

YES

Is

PA2007

terminal

11

less

|no

|

PA2007

defective

or

parts

Poor

PA2008

Tab

terminal

than

3.5

volts?

connected

to

PA2007

to

GND

contact.

YES

terminal

11

defective.

Is

PA2008

terminal

3

|NO

PA2008

defective

over

1.0

volt?

;

®

Motor

Does

not

Stop

Hall

element

defective

or

Hall

element

bias

resistor

defective.

Is

Hall

voltage

DC

bias

Ha:

15-17

volts;

Hb;

4-6

volts:

When

the

motor

is

rotated

by

hand,

is

Hall

voltage

(Ha,

Hb)

generated?

If

resistance

is

high,

coil

wire

is

open;

if

resistance

is

low,

PA2008

is

defective

or

coil

is

shorted.

R5_

defective

or

printed

circuit

open.

With

power

OFF,

is

DC

resistance

between

PA2008

terminals

12—14

and

1—13

60

ohms?

With

power

OFF,

is

DC

resistance

between

PA2008

terminals

7—2

3.9

ohms

YES

PA2008

defective.

e

Motor

Runs

away

Is

Vee

1

29

volts?

NO

Power

supply

circuit

de-

fective.

YES

:

—

|NO

NO

Is

PA2008

terminal

4

10

PA2008

defective.

Parts

connected

to

PA2008

11

volts?

terminal

4

defective.

YES

: :

NO

Is

FG

signal

input

to

?

PC

pattern

open

in

FG.

YES

Parts

connected

to

PA2007

;

NO

serie

oir

i

to

terminal

13

defective

or

PC

ermina

‘

pattern

open.

YES

PA2007

defective

or

parts

connected

to

PA2007

terminal

14

defective.

Is

FG

signal

output

from

PA2007

terminal

14

over

12V

p-p?

NO

YES

Slow

down

the

motor

at

about

33

1/3

rpm

with

a

;

hand,

is

the

prescribed

NO

PA2007

defective

or

Cl

defective.

waveform

output

from

PA2007

terminal

4?

YES

Slow

down

the

motor

at

aoe

33

1/3

rpm

Wes

a

|No

PA2007

defective

or

C3

hand,

is

the

prescribed

:

defective.

waveform

output

from

PA2007

terminal

1?

YES

PA2007

defective,

or

C2

defective,

or

parts

connect

When

the

motor

is

stopped

by

hand,

is

the

output

Is

the

potential

between

PA2007

terminal

5-6

0.5—0.8

volts?

between

PA2007

terminal

5-6

defective.

from

PA2007

terminal

11

less

than

3.5

volts?

YES

PA2008

defective.

5.

PRECAUTIONS

FOR

REASSEMBLY

Follow

these

directions

and

precautions

when

reassembling

a

unit

after

completing

repairs.

Be

sure

to

lubricate

as

required,

make

no

mistakes

when

attaching

parts,

and

avoid

all

other

careless

mistakes

that

may

be

the

cause

of

trouble

later

on.

5.1

AREAS

THAT

REQUIRE

LUBRICATION

NOTE:

Types

of

lubricants

and

areas

where

they

are

used

are

listed

in

table

1.

Table

1

Areas

used

Type

of

Oil

Silicon

Oil

#50000

raising

shaft

GYA-008

all

other

areas

Lubrication

points

are

specified

for

oils

other

than

GYA-008.

Never

use

a

different

type

of

oil.

e

Cam

Section

Apply

oil

to

the

heart-shaped

grooved

section

(rear

side

of

the

cam)

and

lock

plate

sliding

section

in

order

to

minimize

wear

on

the

sliding

section

and

the

burden

on

the

mechanism.

e

Driving

Plate

Assembly

Decrease

the

burden

on

the

mechanism

and

the

wear

on

the

sliding

section.

Sides,

top,

and

bottom

surfaces

e

(sliding

section

of

auto-stop

S

mechanism)

Sides

surface

(sliding

section

of

auto-stop

mechanism)

Top

and

side

EV

cam

side

surface

(sliding

section

of

elevation

cam)

Fig.

5-1

Driving

panel

assembly

section

switch

locker

section

¢

Switch

Locker

Section

Apply

oil

to

the

switch

locker

(opening)

and

sub-panel

base

sliding

section

to

decrease

the

burden

on

the

mechanism.

When

applying

oil

to

the

opening

(shaft

hole),

do

not

apply

any

oil

2—3mm

from

the

bottom

surface.

If

oil

is

applied

2—3mm

within

the

bottom

surface,

it

may

come

out

the

bottom

and

go

between

the

switch

lever

and

sub-panel

base

causing

the

switch

lever

to

operate

ineffectively.

10

Switch

locker

Fig.

5-2

Switch

locker

section

e

EV

Lever

Unit

Section

Apply

oil

to

the

sliding

section

of

leaf

spring

(A)

and

EV

lever

unit

to

decrease

the

burden

on

the

mechanism.

Leaf

spring

(A)

sliding

section

EV

lever

unit

4

EV

lever

unit

sliding

section

|

cane

\

Arm

base

\

Fig.

5-3

EV

lever

unit

section

e

Elevation

Cam

Section

Apply

oil

to

the

elevation

cam

and

sliding

sec-

tion

of

the

raising

shaft

to

decrease

the

burden

when

operated.

Elevation

cam

Fig.

5-4

Elevation

cam

section

e

EV

Sheet

Section

Apply

oil

to

the

raising

shaft

and

sliding

section

of

the

bearing

to

assure

stability

in

the

elevation

lowering

speed.

eit

ee

i

Sas)

Sin

et,