Pioneer PL-5 User manual

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Service

AL

ETAIEY|

REPAIR

&

ADJUSTMENTS

ORDER

NO.

ART-705-0

STEREO

TURNTABLE

L=-5

PL-420

MODEL

PL-5

COMES

IN

FOUR

VERSIONS

DISTINGUISHED

AS

FOLLOWS:

Voltage

Remarks

120V

only

U.S.A.

model

(Without

cartridge)

120V

only

Canada

model

(Without

cartridge)

110V—120V/220V—240V

(Switchable)

|

General

export

model

110V—120V/220V

—240V

(Switchable)

U.S.

military

model

MODEL

PL-420(which

is

minor

change

in

design

from

PL-5)

COMES

IN

THREE

VERSIONS

DISTINGUISHED

AS

FOLLOWS:

Voltage

Remarks

120V

only

U.S.A.

model

110V—120V/220V—240V

(Switchable)

General

export

model

(Without

dust

cover)

110V—120V/220V—240V

(Switchable)

U.S.

military

model

(Without

dust

cover)

=

This

is

the

service

manual

for

model

PL-5/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

francais.

=

Este

manual

de

servicio

trata

del

método

de

ajuste

escrito

en

espanol.

e

For

the

circuit

and

mechanism

descriptions,

please

refer

to

the

supplement

of

model

PL-7

service

manual

(ART-768).

Ne

ne

at

ees

PIONEER

ELECTRONIC

CORPORATION

4-1.

Meguro

1-Chome,

Meguro-ku,

Tokyo

153,

Japan

U.S.

PIONEER

ELECTRONICS

CORPORATION

8&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.

178-164

Boundary

Road,

Braeside,

Victoria

3195,

Australia

FU©®MAY

1981

Printicd

in

Japan

ag

era

CONTENTS

1.

SPECIFICATIONS

....

2.0.02.

022 eee

eee

2

2.

FRONT

PANEL

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

3

3.

DISASSEMBLY

........

200.

e

eee

eee

4

4.

TROUBLESHOOTING

..........-

202s

7

5.

PRECAUTIONS

FOR

REASSEMBLY........

14

6.

P.C.

BOARDS

CONNECTION

DIAGRAM.....

17

7.

SCHEMATIC

DIAGRAM

.............0055

19

1.

SPECIFICATIONS

Motor

and

Turntable

Drive

System

.....0..

0.000

ccc

cece

eee

eee

eee

Direct-drive

MOTOR

sic

ins

tee

cota

Mt

tee

Salle

tte

sl

del

ah

fangs)

wha, LESS

DC

servo

motor

Turntable

Platter

.........

310mm

diam.

aluminum

alloy

die-cast

SPECS?

ooe.ns

Sesh

evn

ole

wescbile

dd

vee

wi

scouts

nace

er

ees

33-1/3

and

45rpm

Wow

and

Flutter

.........

0.00000

ee

Less

than

0.025%

(WRMS)

Signal-to-Noise

Ratio................

More

than

78dB

(DIN-B)

(with

Pioneer

cartridge

model

PC-3MC)

Tonearm

TEV

DO:

5.220

yalens

ccseiece

steve

oa

Static-balance

type,

Straight

pipe

arm

Effective

Arm

Length.

........

0.0000

e

eee

ee

eee

221mm

Overhang.:

cccies-os

conse

tnead

whee

ee

ble

wa

ad

eae

15.5mm

Usable

Cartridge

Weight..............-.

3g

(min.)

to

8g

(max.)

Subfunctions

Full

auto

mechanism,

Anti-skating

force

control,

Stylus

pressure

direct-readout

counterweight,

Cueing

device,

Strobe

light,

Free

stop

hinges

8.

BLOCK

DIAGRAM...............0005.

21

9.

ELECTRICAL

PARTS

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

22

10.

PACKING

..

0...

cc

eee

es

23

11.

EXPLODED

VIEWS

...............0005

23

12.

ADJUSTMENTS.

........

0.00000

cee

29

REGLAGE

Cae

teAE

Ghee

dated

ah

31

ASUST

Ee

seo

ee

Be

ee

ee

es

eit

ae

33

Miscellaneous

Power

Requirements...

2...

0.

eee

ee

AC120V,

60Hz

Power

Consumption

..........

0000

ee

eee

eee

QW

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.

WIGHT

26

405

ee

ew:

BS

ob

Nee

oo

Be

a

GE

SS

5.9kg/13

Ib

Accessories

EPL

AGaDtel”

ictese

soe.

ea

Geta

ee

oats

oh

ole

ee

RA

shee

Bia

Paes

1

Operating

Instructions

NOTE:

Specifications

and

design

subject

to

possible

modification

without

notice,

due

to

improvements.

2.

FRONT

PANEL

FACILITIES

@START/STOP

switch

Depress

this

switch

when

starting

auto

play

or

when

stopping

play.

(2)

REPEAT

switch

Set

this

switch

for

repeat

play.

(3)

DISC

SIZE

switch

Set

this

switch

in

accordance

with

the

size

of

the

record

which

is

to

be

played.

[7°

17]

(released

position):

[12’’

30]

(depressed

position)

:

(4)

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

()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.

@®

SPEED

switch

Set

this

switch

in

accordance

with

the

speed

of

the

re-

cord

which

is

to

be

played.

[33]

(depressed

position):

For

33-1/3

rpm

records

[45]

(released

position):

For

45

rpm

records

For

17

cm

EPs

For

30

cm

LPs

O8O®8

@

Cartridge

(8)

Headshell

Q)

Tonearm

40)

ARM

ELEVATION

lever

Operate

this

lever

when

starting

manual

play

or

when

temporarily

suspending

play.

a)

ANTI-SKATE

control

This

is

rotated

when

performing

the

antiskating

adjust-

ment.

(2

Arm

rest

This

serves

to

hold

and

clamp

the

tonearm.

When

moving

the

tonearm,

release

the

clamp

(13)

Tracking

force

adjustment

weight

This

is

used

when

adjusting

the

tracking

force.

(4)

Platter

(15)

Platter

mounting

shaft

Rubber

mat

47)

EP

adapter

This

is

used

when

playing

records

withouta

‘”

middle.”’

(8)

Cabinet

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

Panel

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.)

.

Set

the

record

size

selector

switch

to

“‘30cm’’.

.

Release

the

arm

clamp

and

move

the

tonearm

as

far

as

it

will

go

toward

the

center.

Then

rotate

the

motor

center

shaft

clockwise

return-

ning

the

tonearm

to

the

arm

rest.

Stop

the

center

shaft.

.

Remove

the

rear

panel

PU

cord

strain

relief.

Weight

assembly

Saen

Rubber

52-

Weight

shaft

assembly

\

Ground

‘wire

Control

mechanism

section

Fig.

3-1

Disassembly

7.

Lift

the

front

section

of

the

panel

(operating

controls)

very

slightly

and

make

sure

the

slider

and

spring

is

disengaged

from

the

selector

lever.

If

the

spring

is

caught

on

something,

use

a

long

and

thin

screwdriver

and

free

the

spring

from

the

large

center

opening.

8.

Unplug

the

2P

and

5P

connectors.

9.

Completely

remove

the

PU

cord

from

the

panel.

10.

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.)

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.

Screwdriver

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).

3.

Undo

the

screw

@

securing

the

tonearm

to

the

arm

base

(See

Fig.

3-3).

Tonearm

lead

wires

Fig.

3-2

Disconnect

the

tonearm

lead

wires

PU

plate

Fig.

3-3

Remove

tonearm

Driver

lever

spring

3.6

PANEL

AND

BASE

REASSEMBLY

1.

Turn

the

center

shaft

clockwise

so

that

the

mechanism

assembly

is

set

to

the

reset

posi-

tion.

Hook

the

driver

lever

spring

to

the

panel

boss.

Lift

the

forward

of

the

panel

and

plug

in

the

2P

and

5P

connectors.

Clamp

the

tonearm

in

the

arm

rest

and

push

the

START/STOP

button.

Driver

lever

Fig.

3-4

Spring

positioning

.

Attach

the

PU

cord

stopper.

.

Attach

the

insulators.

(Make

certain

the

color-

coded

float

springs

are

attached

to

the

correct

insulators.)

.

Attach

the

weight

shaft

assembly.

Start

Jever

Driver

lever

spring

Fig.

3-5

Positioning

the

spring

4.

TROUBLESHOOTING

Use

the

following

directions

to

find

the

cause

of

each

type

of

breakdown.

Improper

adjustment

units

should

be

completely

readjusted.

=#

DOES

NOT

LEAD

IN

Motor

does

not

rotate.

YES

Arm

clamp

is

not

released.

m

”

Depression

in

EV

rubber

sheet.

YES

Tracking

force

is

too

heavy.

YES

Insufficient

torque

on

the

lead-in

latch.

(See

section

1)

YES

PU

plate

is

not

properly

attached.

a

Oo

Oo

m

n

2

1)

oo

|

2)

m

vU

m

>

=

Repeat

switch

is

not

ON.

YES

The

start

lever

unit

pin

is

separated

from

the

driving

lever

unit

section.

(See

section

2)

Control

lever

SP

is

weak.

Section

2

As

shown

in

figure

4-2,

if

the

start

lever

unit

Pin

is

out

of

line

in

the

direction

of

@

,

repeat

will

not

operate.

If

it is

too

far

in

the

direction

of

;

the

unit

will

not

start.

In

these

cases,

assemble

referring

to

the

method

of

joining

the

panel

and

bottom

panel

(lid).

NO

Refer

to

the

‘‘Motor

does

not

rotate”

section.

Section

1

As

shown

in

figure

4-1,

if

the

forre

requirea

to

turn

over

the

lead-in

latch

is

less

tha

1

80g

ata

point

13mm

from

the

center,

bend

tke

click

leaf

spring

toward

until

the

force

is

180

—

320g.

Lead-in—|3™.

latch

,,)

Bend

“(180

—

3204)

Click

leaf

spring

EV

cam

Fig.

4-1

Adjustment

of

lead-in

latch

with

isu

fficient

torque

Driving

lever

(B

®

oA

Pin

Driving

leveispr-

ing

Surface

AX

a

Set

;

Control!

U

Start

lever

unit

base

Fig.

4-2

Misaligned

pin

of

start

lever

init

=

REPEAT

FUNCTION

IS

REPEATED

Separate

the

panel

section

and

bottom

panel

and,

as

shown

in

figure

4-3,

apply

a

tension

of

10g

to

the

start

lever

unit

pin

in

direction(A)

If

the

repeat

function

operates,

the

selector

and

reset

plate

sections

are

not

moving

properly.

If

the

unit

stops,

the

driving

lever

(B)

is

not

moving

properly.

Driving

lever

(B)

is

not

moving

pro-

NO

perly.

YES

Start

lever

is

not

moving

properly.

NO

YES

Selector

is

not

moving

properly.

NO

(See

section

3)

YES

Reset

plate

is

not

moving

properly.

NO

(See

section

4)

YES

Reset

plate

SP

is

weak.

Section

3

If

there

are

protrusions

remaining

from

the

original-pressing

process

on

surfaces

@),®),

and

©of

the

sub-panel

which

slides

with

the

selector,

the

movement

of

the

selector

will

be

adversely

affected.

Therefore,

these

protrusions

must

be

removed

(Fig.

4-4).

Section

4

If

there

are

plastic

protrusions

on

the

pressure

pin

section

of

section

(D)

of

the

reset

plate,

these

protrusions

will

come

in

contact

with

the

lower

surface

of

the

driving

panel

when

the

reset

plate

moves

in

direction

(E)

and

the

movement

of

the

reset

plate

will

be

adversely

affected.

Therefore,

these

protrusions

must

be

removed

(Fig.

4-4).

=

AUTO-RETURN

DOES

NOT

WORK

Section

5

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

(B)

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

(C)so

that

dimension

A

is

0.5mm

or

larger.

4)

Sub-panel

Start

lever

unit

Fig.

4-3

Check

of

repeat

operation.

Driving

lever

(B)

shaft

is

bent.

Start

lever

is

warped.

Plastic

protrusions

on

cut

surfaces

of

the

sub-panel

of

the

selector

slide

section.

Protrusions

on

reset

plate

pressure

pin.

®

Sub-panel

(2e>

m

SON

@®

Lv

\C

MINS

Reset

plate

SP

20

.

So

Reset

o=

plate

Fig.

4-4

Improper

movement

of

selector

Signal

plate

Starting

plate

TOO

least

0.5mm

Cam

Fig.

4-5

Incomplete

reset

of

starting

and

signal

plates

Change

in

starting

position

adjust-

ment.

YES

Starting

plate

does

not

follow

the

NO

Too

much

grease

between

the

signal

signal

plate.

plate

and

the

cam.

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.

i

After

starting,

incomplete

reset

of

the

NO

The

curved

section

of

the

signal

signal

plate.

(See

section

5)

plate

is

deformed.

YES

The

inner

areas

of

records

can

not

7

;

be-tracked.

Arm

lead

wire

is

caught

on

something.

YES

PU

cord

is

touching

the

PU

plate.

Operator

of

the

detection

lever

is

not

smooth.

i

Looseness

in

the

PU

plate

attach-

ment.

=

RETURN

IS

FAST

(RETURN

AT

1mm

PITCH)

Protrusions

on

the

pinion

gear

section

(See

section

6)

Section

6

If

there

are

rough

areas

of

plastic

protruding

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.

4-6

Elimination

of

pinion

plastic

protrusions

completely

(Fig.

4-6).

gear

protrusions

Pinion

geai

Protruding

section

=

TONEARM

DOES

NOT

LOWER

IN

CORRECT

POSITION

Incorrect

adjustment.

YES

PU

plate

operation

is

not

smooth.

PU

lever

A

and

PU

lever

B

are

not

moving

smoothly.

Location

of

stylus

was

changed

during

cartridge

replacement.

=

RECORD

SIZE

SELECTOR

DOES

NOT

WORK

Tonearm

descends

at

17cm

location

when

record

size

selector

is

set

at

30cm.

Size

select

SP

is

warped.

YES

Size

select

lever

does

not

operate

Size

select

lever

is

warped

smoothly.

:

Tonearm

descends

at

30cm

location

when

record

size

selector

is

set

at

17cm.

Size

select

return

SP

is

warped.

YES

Plastic

protrusions

in

auto-stop

mechanism

resin

section

of

the

select

lever

sliding

surface.

Select

lever

does

not

operate

smooth-

ly.

Plastic

protrusions

on

the

select

lever.

Index

cam

does

not

operate

smoothly.

=

Sapte

ped

sheoked

Secnen

YES

Size

select

SP

is

weak.

|

#

MOTOR

DOES

NOT

ROTATE

2P

or

5P

connectors

are

not

at-

tached.

YES

Connector(s)

is

not

properly

installed.

10