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~

AKAL

service

mnt

FULL

AUTOMATIC

PLAYER

| |

mov.

AP-M50

ABBREVIATIONS

FOR

SERVICE

MANUAL

move.

AP-M50

ABBREVIATIONS

ey

EXPLANATION

pc

ane

Direct

Current

MM

Main

Motor

AM

Arm

Motor

TS

Tracking

Sensor

O/S

ee

Open/Close

L

|

Low

(Referring

to

Voltage)

H

,

High

(Referring

to

Voltage)

LED

Light

Emitting

Diode

FF

Fast

Forward

FWD

ForWarD

REV

|

;

REVerse

FULL

AUTOMATIC

PLAYER

mopeLA

P-M50

SECTION

1

SERVICE

MANUAL

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

3

SECTION

2.

PARTS

LIST

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

222

eee

eee

11

SERVICE

MANUAL

AP-M50

SAFETY

INSTRUCTIONS

SAFETY

CHECK

AFTER

SERVICING

Confirm

the

specified

insulation

resistance

between

power

cord

plug

prongs

and

externally

exposed

parts

of

the

set

is

greater

than

10

Mohms,

but

for

equipment

with

external

antenna

terminals

(tuner,

receiver,

etc.)

and

is

intended

for

[C]

or

[A],

specified

insulation

resistance

should

be

more

than

2.2

Mohms

(ground

terminals,

microphone

jacks,

headphone

jacks.

line-in-out

jacks

etc.)

.

PRECAUTIONS

DURING

SERVICING

1.

2.

BO

008

SDS

Parts

identified

by

the

A\

symbol

parts

are

critical

for

safety.

Replace

only

with

parts

number

specified.

In

addition

to

safety,

other

parts

and

assemblies

are

specified

for

conformance

with

such

regulations

as

those

applying

to

spurious

radiation.

These

must

also

be

replaced

only

with

specified

replacements.

Examples:

RF

-converters,

tuner

units,

antenna

selector

switches,

RF

cables,

noise

blocking

capacitors,

noise

blocking

filters,

etc.

Use

specified

internal

wiring.

Note

especially:

1)

Wires

covered

with

PVC

tubing

2)

Double

insulated

wires

3)

High

voltage

leads

Use

specified

insulating

materials

for

hazardous

live

parts.

Note

especially:

1)

Insulation

Tape

2)

PVC

tubing

3)

Spacers

(Insulating

Barriers)

4)

Insulation

sheets

for

transistors

5)

Plastic

screws

for

fixing

microswitch

(especially

in

turntable)

When

replacing

AC

primary

side

components

(transformers,

power

cords,

noise

blocking

capacitors,

etc.),

wrap

ends

of

wires

securely

about

the

terminals

before

soldering.

o>

c>

Observe

that

wires

do

not

contact

heat

producing

parts

(heatsinks,

oxide

metal

film

resistors,

fusible

resistors,

etc.).

Check

that

replaced

wires

do

not

contact

sharp

edged

or

pointed

parts.

Also

check

areas

surrounding

repaired

locations.

Use

care

that

foreign

objects

(screws,

solder

droplets,

etc.)

do

not

remain

inside

the

set.

VOLTAGE

CONVERSION

Each

machine

is

preset

at

factory

according

to

its

destination,

but

some

machines

can

be

set

to

110V/120V

or

220V/240V

as

required.

If

your

machine’s

voltage

can

be

converted:

Before

connecting

the

power

cord

or

assembling

the

platter

turn

the

Voltage

Selector

located

on

the

top

of

the

cabinet

with

a

screwdriver

until

the

correct

voltage

is

indicated.

Models

for

USA,

Canada,

Europe,

UK

and

Australia

are

not

equipped

with

this

facility.

NOTE:

Cycle

conversion

is

unnecessary

since

AP-M50

use

a

DC

motors.

Se

ae

er

TE

—=-

SERVICE

MANUAL

AP-M50

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

I.

SPECIFICATIONS

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

biped

died

MUGS

lens

ptt

Diet

che

eel

eG

edi

tates

4

il.>.

‘DISMANTEING

OF

UNIT

sieosnct0

oh.

Side

Sassen

teas

ove

s

ee

aat

eee

wetter

eae

5

HERS

“CONT

ROU

S

485

eters

Sore

es

betes

oat

«Dan

Pe

Raceseien

a

ata

dylan

aoa

cebdarela

esha

a

deat

6

IV;

PRINCIPAL

PARTS

LOCATION

(53.53

sc

pavedied

oes

see

he

oe

Ba

here

oie

eee

tiae

nue

ie

9

We.

ADIUSIMEN

T

3x

5

Goa

ciscdas

oe

Hi

Pate

dele

keen

Foe

TS

ee

ew

eae

Sa

gee

Re

ipa

8

1.

ORDINARY

MECHANICAL

ADJUSTMENT.......

ka

ciccateansctr

acacia

Set

a

actsone

wang

8

2.

ELEVATION

AND

POSITION

ADJUSTMENT

...........

0.0

e

cece

e

eee

eee

e

teen

ence

enes

8

3.

ARM

OFFSET

VOLTAGE

ADJUSTMENT

(Refer

to

Fig.

5-2)

.......0.

20sec

eee

ee

cence

eee

ees

9

4.

TRACKING

SENSOR

SENSITIVITY

ADJUSTMENT

(Refer

to

Fig.

5-2)

.......

0.00.

sees

ee

eee

9

5.

MUSIC

INTERVAL

SENSOR

SENSITIVITY

ADJUSTMENT

(Refer

to

Fig.

5-2)...........-..4.

9

6.

SPEED

ADJUSTMENT

(Refer

to

Fig.

5-3)...

0.

ccc

cece

cence

cece

ence

nent

een

eet

ne

enens

9

7.

LEAD-IN

POSITION

ADJUSTMENT

(Refer

to

Fig.

5-4)

0.060.000.

cc

cece

cece

cece

eee

eee

eeee

9

VI.

PC

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

............0.000

020s

e

cece

eeeeees

10

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

TECHNICAL

MANUAL.

SERVICE

MANUAL

AP-MS50

Il.

SPECIFICATIONS

TURNTABLE

(PLATTER)

Aluminum

Alloy

Diecast

DRIVE

SYSTEM

‘|

Belt

Drive

MOTOR

EG-Servo

DC

Motor

SPEED

33-1/3

&

45

rpm

WOW

&

FLUTTER

0.04%

(W

RMS)

RUMBLE

70dB

(DIN-B)

TONE

ARM

'|

Static

Balance

Linear

Tracking

Type

EFFECTIVE

ARM

LENGTH

90mm

ARM

LIFTER

~

|

Oil

Damped

OVER

HANG

Omm

CARTRIDGE

OUTPUT

VOLTAGE

CHANNEL

SEPARATION

OPTICAL

STYLUS

PRESSURE

2.5mV

+3dB

(at

1kHz)

More

than

18dB

2g

POWER

REQUIREMENTS

120V,

60Hz

for

USA

&

Canada

220V,

50Hz

for

Europe

except

UK

240V,

SOHz

for

UK

&

Australia

110V/120V—220V/240V,

50/60Hz

Convertible

for

other

countries

DIMENSIONS

350(W)

x

90(H)

x320(D)

mm

(13.8

x

3.5

x

12.6

inches)

WEIGHT

3.8kg

(8.4

Ibs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

SERVICE

MANUAL

AP-M50

ll.

DISMANTLING

OF

UNIT

BOTTOM

COVER

In

case

of

trouble,

etc.

necessitating

dismantling,

please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

SCREWS

DUST

COVER

RUBBER

SHEET

PLATTER

SCREWS

SERVICE

MANUAL

AP-M50

lil,

CONTROLS

DUST

COVER

wa

0

TONE

ARM

ae

A

a

ay

|

RUBBER

MAT

:

)

SPEED

SELECTOR

A

2,

SENSITIVITY

eral

SELECTOR

————————

J.

—————s—sézaMm

eS

START

CUT

(<==)

BUTTON

POWER

ON/OFF

SWITCH

PROGRAM

DISPLAY

|

»~rpm

FORWARD

(

<K))

and

RANDOM

PROGRAM

BACKWARD

(

b>

)

BUTTON

PLAY

SYSTEM

BUTTONS

CUE

(y

¥)

BUTTON

SERVICE

MANUAL

AP-MS50

a

SENSOR

.

Shey.

IV.

PRINCIPAL

PARTS

LOCATION

OPEN/CLOSE

SWITCH

sw90l

POWER

PCB

PIO4IA5O0ID

SYSTEM

CONTROL

PCB

PIO4IASOIA

MAIN

MOTOR

PCB

SWITCH

(A)

PCB

PIO41A501B

ARM

MOTOR

M902

ARM

MOTOR

PCB

PIO4IASOIM

ARM

POSITION

SENSOR

(TR)

PCB

PIO41ASOIF

ARM

POSITION

SENSOR

(LED)

PCB

PIO41A501G

SERVICE

MANUAL

AP-MSO

MOVING

BASE

PCB

PIO4IASOIK

PLUNGER

SL90]

TRACKING

SENSOR

PCB

PIO41A5OIL

Fig.

4-1

SENSOR

PCB

PIO41C5020

POWER

TRANSFORMER

T90l

APT

-1041~

70

APT-5-10

~

20

-

30

-

40

-

50

>|

[F]

[o]

MOTOR

M9OI

TRANSISTOR

PCB

PIO4IASOIN

IC

PCB

PIO4IA5OIP

SIZE

SENSOR

PCB

P1041D5030

SWITCH

(B)

PCB

PIO41AS5SOIC

Fig.

4-2

V.

ADJUSTMENT

5-1.

ORDINARY

MECHANICAL

ADJUSTMENT

1)

Ordinary

Mechanical

Adjustment

such

as

Stylus

Pressure,

Overhang

and

Tone

Arm

Height

Adjustment

are

not

necessary

since

this

model

is

equipped

with

a

Static-Balance

Linear

Tracking

Tone

Arm.

2)

Stylus

Pressure

is

pre-adjusted

to

2.0

grams

at

the

factory,

and

re-adjustment

is

not

necessary

in

normal

conditions.

5-2.

ELEVATION

AND

POSITION

ADJUSTMENT

1)

This

adjustment

is

not

necessary

unless

the

Elevation

or

Elevation

prop

is

replaced

or

mis-adjusted.

2)

Hold

the

Tone

Arm

with

the

Moving

Base

Block

and

separate

the

Elevation

Prop

from

the

Tone

Arm.

Then,

bring

the

Elevation

prop

close

to

the

Tone

Arm,

and

adjust

the

Elevation

prop

close

to

the

Tone

Arm,

and

adjust

the

Elevation

Prop

with

a

flat

type

screw-driver

to

the

place

where

the

position

of

the

notch

(A)

on

the

Elevation

Prop

coincides

with

the

projection

part

(B)

on

the

Tone

Arm

as

shown

in

Fig.

5-1.

MOVING

BASE

BLK

VR4

VR5

VR2

VR3

CH~I|

CH-2

CH-1

CH-2

UP

UP

DOWN DOWN

Se

MUSIC

INTERVAL

SENSOR

SENSITIVITY

VRI

VRE

@

TRACKING

SENSOR

SENS

ARM

OFF

-SET

Fig.

5-1

SYSTEM

CONTROL

PCB

PIO4IASOIA

SERVICE

MANUAL

AP-MS50

Fig.

5-2