Pioneer PL-4 Manuale utente

Service

PAL

ETUIET

REPAIR

ADJUSTMENTS

ORDER

NO.

ART-709-0

STEREO

TURNTABLE

L.—<}

PL-320

MODEL

PL-4

COMES

SEVEN

VERSIONS

DISTINGUISHED

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

FIVE

VERSIONS

DISTINGUISHED

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

the

service

manual

for

model

PL-4/KUT.

For

servicing

the

other

types,

please

refer

the

additional

service

manual.

®=

manuel

d’instruction

refére

mode

réglage,

frangais.

Este

manual

servicio

trata

del

método

ajuste

escrito

espajiol.

PIONEER

ELECTRONIC

CORPORATION

4-1.

Meguro

1-Chome,

Meguro-ku,

Tokyo

153,

Japan

U.S.

PIONEER

ELECTRONICS

CORPORATION

Oxford

Drive,

Moonachie,

New

Jersey

07074,

U.S.A.

PIONEER

ELECTRONIC

(EUROPE)

N.V.

Luithagen-Haven

2030

Antwerp,

Belgium

PIONEER

ELECTRONICS

AUSTRALIA

PTY.

LTD.

178-184

Boundary

Road,

Braeside,

Victoria

3195,

Australia

APR.

1981

Printed

Japan

For

the

circuit

and

mechanism

descriptions,

please

refer

the

supplement

model

PL-7

service

manual

(ART-768).

CONTENTS

SPECIFICATIONS

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

000s

eee

FRONT

PANEL

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

DISASSEMBLY

...

0...

eee

eee eee

TROUBLESHOOTING.

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

000

PRECAUTIONS

FOR

REASSEMBLY........

BLOCK

DIAGRAM..........

00ers

P.C.

BOARDS

CONNECTION

DIAGRAM.....

SPECIFICATIONS

Motor

and

Turntable

Drive

System

1.0...

eee

teen

eae

Direct-drive

IMG

BOF

sister,

ecncte

cabin,

bes

gris

Sens

Dhansel

ROEUE,

Cate

Hen

eee

iets

servo

motor

Turntable

Platter.

.........310mm

diam.

aluminum

alloy

die-cast.

SPECS

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

than

78dB

(DIN-B)

(with

Pioneer

cartridge

model

PC-3MC)

Tonearm

are

oes

Aucune

ecole

Static-balance

type,

Straight

pipe

arm

Effective

Arm

Length

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

2200-2

eee

221mm

Overhang:

escaped

acess

dow

ogc

Gee

ert

acs

ale

15.5mm

Usable

Cartridge

Weight

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

(min.)

(max.)

Subfunctions

Auto-return

mechanism,

Anti-skating

force

control,

Stylus

pressure

direct-readout

counterweight,

Cueing

device,

Strobe

light,

Free

stop

hinges

Miscellaneous

Power

Requirements.

...........

AC120V,

60Hz

Power

Consumption

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

0000

cece

Dimensions

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

420(W)

108(H)

367(D)mm

16-1/2(W)

4-1/4(H)

14-7/16(D)in.

Weight

.'65

5.0.

vslare

Bla

teen

plete

5.8kg/12

SCHEMATIC

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

EXPLODED

VIEWS

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

10.

ELECTRICAL

PARTS

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

11.

ADJUSTMENTS.

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

2002

eee

REGLAGE.

cal

tyies

cea

uae

naam

AIJUST

Eee

GGA

Reh

eed

12.:-PAGKING

Saas

ore

whee

Accessories

Adapters

5.3.22

foes

lense

ce ek

tee

Rte

SEN

Operating

Instructions...

2...

...0.0.0.00.000.

000

eee

NOTE:

Specifications

and

design

subject

possible

modification

without

notice,

due

improvements.

thigh

FRONT

PANEL

FACILITIES

()

CUT

switch

Depress

this

switch

stop

play.

(2)

Speed

check

window

Look

through

this

window

and

observe

the

movement

the

striped

pattern

when

checking

the

rotational

speed

finely

adjusting

the

speed.

The

position

the

striped

pattern

differs

according

the

power

line

frequency

(50

Hz)

the

area

use

and

the

speed

(33

rpm)

the

platter.

Top

pattern:

For

rpm

area

Second

pattern:

For

rpm

area

Third

pattern:

For

rpm

area

Bottom

pattern:

For

rpm

area

(3)SPEED

ADJ

control

Rotate

this

control

order

finely

adjust

the

speed

the

platter.

The

speed

reduced

when

the

control

rotated

the

]

direction.

The

speed

increased

when

the

control

rotated

the

[+]

direction.

(4)

SPEED

switch

Set

this

switch

accordance

with

the

speed

the

re-

cord

which

played.

[33]

(depressed

position):

[45]

(released

position):

©)

Cartridge

For

33-1/3

rpm

records

For

rpm

records

(6)

Headshell

Tonearm

(8)

ARM

ELEVATION

lever

Operate

this

lever

when

starting

record

play

when

temporarily

suspending

play.

ANTI-SKATE

control

This

rotated

when

performing

the

anti-skating

adjust-

ment.

Arm

rest

This

serves

hold

and

clamp

the

tonearm.

When

moving

the

tonearm,

release

the

clamp.

(})

Tracking

force

adjustment

weight

This

used

when

adjusting

the

tracking

force.

Platter

(3)

Platter

mounting

shaft

Rubber

mat

(5)

adapter

This

used

when

playing

records

without

‘‘middle.”’

(16

Cabinet

(7)

Dust

cover

DISASSEMBLY

3.1

PANEL

AND

BASE

removing

the

panel,

the

below

listed

steps

the

order

given.

Using

any

unnecessary

force

will

result

bending

the

springs

damaging

other

parts.

Panel

removal

steps

Remove

the

headshell

and

weight

assembly,

and

the

weight

shaft

assembly.

The

weight

shaft

assembly

removed

loosening

screw

(Hexagone

socket

screw)

and

the

headshell

loosening

screw

Lift

off

the

turntable

platter.

Turntable

platter

Panel

Motor

—

assembly

omen

Base

Dust

cover

Loosen

insulator

attachment

screws

and

remove

the

insulator.

(Do

not

mix

the

color-

coded

float

springs.

They

must

replaced

with

their

original

insulators

during

reassemb-

ly.)

Remove

the

rear

panel

cord

strain

relief.

Unplug

the

and

connectors.

Completely

remove

the

cord

from

the

panel.

Lift

the

headshell

end

the

tonearm,

and

taking

care

not

damage

the

tonearm,

remove

from

the

panel.

(Hold

the

tonearm

steady.)

Weight

assembly

Screw

Rubber

bush

Control

mechanism

assembly

Insulator

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

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

plate

Fig.

3-3

Remove

tonearm

3.5

TONEARM

Disconnect

the

tonearm

lead

wires

from

the

board

(See

Fig.

3-2).

Note

that

some

the

lead

wires

have

been

soldered

the

board,

and

must

discon-

nected

with

care.

Loosen

the

set

screw

with

screwdriver

remove

the

plate

under

the

arm

base

(See

Fig.

3-3).

Undo

the

screw

securing

the

tonearm

the

arm

base

(See

Fig.

3-3).

Tonearm

lead

wires

board

Red

Fig.

3-2

Disconnect

the

tonearm

lead

wires

(Hexagone

socket

screw)

Arm

base

TROUBLESHOOTING

Use

the

following

directions

find

the

cause

each

type

breakdown.

Improperly

adjustment

units

should

completely

readjusted.

AUTO-RETURN

DOES

NOT

WORK

Change

starting

position

adjust-

ment.

Starting

plate

does

not

the

Too

much

grease

between

the

signal

plate.

plate

and

the

cam

YES

Inner

diameter

the

starting

plate

hole

small.

Protrusions

the

caulk

section

the

starting

plate

hole.

Not

enough

grease

between

the

starting

plate

and

signal

plate.

After

starting,

incomplete

reset

the

The

curved

section

the

signal

plate.

(See

Section

plate

deformed.

YES

Arm

lead

wire

caught

something.

cord

touching

the

plate.

The

inner

areas

records

can

not

tracked.

Operator

the

detection

lever

not

smooth.

Looseness

the

plate

attach-

ment.

Section

After

performing

the

return

operation,

the

curved

section

the

signal

plate

and

curved

sect-

ion

the

starting

plate

are

not

contact

with

surfaces

and

respectively

the

cam,

reset

will

incomplete

and

the

starting

position

will

late.

result,

the

return

function

may

not

operate

times.

this

case,

bend

the

signal

plate

©)so

that

dimension

(A)

0.5mm

larger.

Cam

Fig.

4-1

Incomplete

reset

starting

and

signal

plates.

Starting

plate

least

0.5mm

see

Bae

Lay

=»

RETURN

FAST

(RETURN

1mm

PITCH)

Protrusions

the

pinion

gear

section

(See

section

Section

Pinion

gear

there

are

rough

areas

plastic

protruding

Protruding

section

from

the

(A)

section

the

protruding

section

the

pinion

gear,

the

return

function

may

operate

pitch

only

1mm.

this

case,

remove

the

Fig.

4-2

Elimination

pinion

gear

protrusions

plastic

protrusions

completely

(Fig.

4-2)

MOTOR

DOES

NOT

ROTATE

and

connectors

are

not

attach-

ed.

YES

Connector(s)

not

properly

installed.

MOTOR

DOES

NOT

STOP

The

switch

lever

and

switch

locker

The

installation

location

the

are

not

locking

(See

section

plate

incorrect.

Section

plate

order

turn

the

power

OFF,

the

plate

shaft

touches

surface

the

switch

locker

pushing

over

locks

with

the

switch

lever

turning

the

microswitch

OFF

(Fig.

4-3).

the

amount

push

the

switch

locker

insuf-

ficient,

can

not

lock

with

the

switch

lever.

With

the

tonearm

locked

the

arm

rest,

shown

Switch

lever

figure

4-4,

attach

the

plate

precisely

mid-

Mads

rel

Peers

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

plate

MOTOR

ASSEMBLY

NOTE:

The

PA2008

used

the

PXM-090

does

not

have

dedicated

ground

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

and

thermal

dissipator

and

between

the

thermal

dissipator

and

motor

base,

and

base

circuit

board

securely

tightened.

Motor

Does

not

Turn

are

Component

connected

Vee

volts?

supply

circus

detec:

PA2008

terminal

defec-

YES

tive.

ane

eae

term

PA2008

defective.

YES

PA2007

terminal

less

|no

PA2007

defective

parts

Poor

PA2008

Tab

terminal

than

3.5

volts?

connected

PA2007

GND

contact.

YES

terminal

defective.

PA2008

terminal

|NO

PA2008

defective

over

1.0

volt?

;

Motor

Does

not

Stop

Hall

element

defective

Hall

element

bias

resistor

defective.

Hall

voltage

bias

Ha:

15-17

volts;

Hb;

4-6

volts:

When

the

motor

rotated

hand,

Hall

voltage

(Ha,

Hb)

generated?

resistance

high,

coil

wire

open;

resistance

low,

PA2008

defective

coil

shorted.

R5_

defective

printed

circuit

open.

With

power

OFF,

resistance

between

PA2008

terminals

12—14

and

1—13

ohms?

With

power

OFF,

resistance

between

PA2008

terminals

7—2

3.9

ohms

YES

PA2008

defective.

Motor

Runs

away

Vee

volts?

Power

supply

circuit

de-

fective.

YES

—

|NO

PA2008

terminal

PA2008

defective.

Parts

connected

PA2008

volts?

terminal

defective.

YES

: :

signal

input

pattern

open

FG.

YES

Parts

connected

PA2007

;

serie

oir

terminal

defective

ermina

‘

pattern

open.

YES

PA2007

defective

parts

connected

PA2007

terminal

defective.

signal

output

from

PA2007

terminal

over

12V

p-p?

YES

Slow

down

the

motor

about

1/3

rpm

with

;

hand,

the

prescribed

PA2007

defective

defective.

waveform

output

from

PA2007

terminal

YES

Slow

down

the

motor

aoe

1/3

rpm

Wes

|No

PA2007

defective

hand,

the

prescribed

defective.

waveform

output

from

PA2007

terminal

YES

PA2007

defective,

parts

connect

When

the

motor

stopped

hand,

the

output

the

potential

between

PA2007

terminal

5-6

0.5—0.8

volts?

between

PA2007

terminal

5-6

defective.

from

PA2007

terminal

less

than

3.5

volts?

YES

PA2008

defective.

PRECAUTIONS

FOR

REASSEMBLY

these

directions

and

precautions

when

reassembling

unit

after

completing

repairs.

sure

lubricate

required,

make

mistakes

when

attaching

parts,

and

avoid

all

other

careless

mistakes

that

may

the

cause

trouble

later

on.

5.1

AREAS

THAT

REQUIRE

LUBRICATION

NOTE:

Types

lubricants

and

areas

where

they

are

used

are

listed

table

Table

Areas

used

Type

Oil

Silicon

Oil

#50000

raising

shaft

GYA-008

all

other

areas

Lubrication

points

are

specified

for

oils

other

than

GYA-008.

Never

use

different

type

oil.

Cam

Section

Apply

oil

the

heart-shaped

grooved

section

(rear

side

the

cam)

and

lock

plate

sliding

section

order

minimize

wear

the

sliding

section

and

the

burden

the

mechanism.

Driving

Plate

Assembly

Decrease

the

burden

the

mechanism

and

the

wear

the

sliding

section.

Sides,

top,

and

bottom

surfaces

(sliding

section

auto-stop

mechanism)

Sides

surface

(sliding

section

auto-stop

mechanism)

Top

and

side

cam

side

surface

(sliding

section

elevation

cam)

Fig.

5-1

Driving

panel

assembly

section

switch

locker

section

Switch

Locker

Section

Apply

oil

the

switch

locker

(opening)

and

sub-panel

base

sliding

section

decrease

the

burden

the

mechanism.

When

applying

oil

the

opening

(shaft

hole),

not

apply

any

oil

2—3mm

from

the

bottom

surface.

oil

applied

2—3mm

within

the

bottom

surface,

may

come

out

the

bottom

and

between

the

switch

lever

and

sub-panel

base

causing

the

switch

lever

operate

ineffectively.

Switch

locker

Fig.

5-2

Switch

locker

section

Lever

Unit

Section

Apply

oil

the

sliding

section

leaf

spring

(A)

and

lever

unit

decrease

the

burden

the

mechanism.

Leaf

spring

(A)

sliding

section

lever

unit

lever

unit

sliding

section

cane

Arm

base

Fig.

5-3

lever

unit

section

Elevation

Cam

Section

Apply

oil

the

elevation

cam

and

sliding

sec-

tion

the

raising

shaft

decrease

the

burden

when

operated.

Elevation

cam

Fig.

5-4

Elevation

cam

section

Sheet

Section

Apply

oil

the

raising

shaft

and

sliding

section

the

bearing

assure

stability

the

elevation

lowering

speed.

eit

Sas)

Sin

et,

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