Akai AP-207 Manuale utente

AP-307

AKAI

DIRECT

DRIVE

FULLY

AUTOMATIC

TURNTABLE

AND

QUARTZ

LOCK

DIRECT

DRIVE

FULLY

AUTOMATIC

TURNTABLE

woo.

AP-207

AP-307

ALSO

APPLICABLE

TO

BLACK

MODEL

SECTION

1

SERVICE

MANUAL

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

eee

eters

3

SECTION

2

PARTS

LIST

.........--

22:

ee

eee

29

SECTION

3.

SCHEMATIC

DIAGRAM

......-.------++->

-...

48

Il.

ii.

VI.

VII.

VOI.

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

TECHNICAL

DATA

..

0.22...

eee

putt

&

eegh

ses

4

1s

-MODELMAP

207

|

ete

one

ote

Raa

Bh

wk

wee

ee

OSE

Ai

ee

oleh,

OS

4

2:

MODEL

CAR

BOF

casera

Jieeela

wlaee

woe

eed

HONG

Cpe

AT

alate

eletes

4

DISMANTLING

OF

UNIT...

1.0

ee

ene

5

CONTROES

»

Gees

acceso

has

ebm

Ses

a

Sere

a

Gy

etes

BME

sg

OH

MLR

So Be

Shae

6

1.

MODEL:

AP-207

i356

/c

bi

ate

aid

ae

es

eh

Eevee

at

oe

ed

anaes

6

2

MODEEVAP-3O7

0

3

bles

eed

oe

BASE

a

Meee

emp

ae

ese

Lee

Re

7

PRINCIPAL

PARTS

LOCATION

..........

hs

aa

Lhd

ithe:

yang

ca

Mesiaie

ae

8

Le

(MODEG.AP-207)

copa

ed

ee

Pete

eek

eae

Bae

SA

s

Bes

8

22

MODEL.

APIS

O07:

22s

sc¢8

tla

hee

ihe

og

HOS

oP

Vee

oa

eee

eres

8

BLOCK

DIAGRAM

..

1...

0.6

en

tee

eee

eens

9

Le:

MODDED

AP2207

iieic

gale

2

age ere

oh

US

oe

ees

Ba

ee

eee

9°

2.

MODEEAP-307)

«ence

oe

cog

CMa

Pe

Ve

bbe

see

ee

9

CIRCUIT

OPERATION

.

00.1.

eee

eens

10

Pe

GENERATS

250.628

oi

ngechee

to

aie

nethnd.

salar

eos

nee

aap

oe

eke

Mae

tea

aed

10

2.

SERVO

CIRCUIT

4

a2.ac

naa

sping

wee

ane

tides

Saw

palatine

10

3.

STROBE

LIGHT

CIRCUIT

..

0.0...

ce

ee

eee

11

MECHANICAL

ADJUSTMENT

......

0...

cee

eee

12

1.

STYLUS

PRESSURE

ADJUSTMENT

.......

2.0.00

cece

eee

eeee

12

2.

OVERHANG

ADJUSTMENT

..

1.0...

ec

eee

13

3.

SLEEVE

POSITION

ADJUSTMENT

..

1.2.0...

00...

eee

14

4,

ARM

LIFTER

HEIGHT

ADJUSTMENT

.........0..

00.00

-eeeee

14

5,

AUTOMATIC

ARM

CONTROL

ADJUSTMENT

...........-..--5.-

15

ELECTRICAL

ADJUSTMENT

....

1.0...

cee

ee

eens

Le.

16

1,

DIRECT

DRIVE

P.C

BOARD

ADJUSTMENT

...............4-.

.

16

2.

PLL

P.C

BOARD

ADJUSTMENT

........

Piossatlel

eh

cate

ya

lon

de

sec ah?

oeaatea

ea

hha

_

17

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

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

2

eee

19

1,

P.C

BOARD

TITLE

AND

IDENTIFICATION

NUMBER

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

19

2.

COMPOSITION

OF

VARIOUS

P.C

BOARDS

..............0-.0055

.

20

I

TECHNICAL

DATA

1.

MODEL

AP-207

TURNTABLE

314

mm

aluminium

alloy

die-cast

DRIVE

SYSTEM

Direct

Drive,

Fully

Automatic

MOTOR

Bb

DC

Servo

Motor,

Geared

Motor

for

Tone

Arm

Drive

SPEED

&

PITCH

CONTROL

33-1/3

and

45

rpm

+2.5%

SPEED

ACCURACY

1,000

Hz

+0.15%

WOW

AND

FLUTTER

0.035%

(DIN),

0.025%

(JIS)

RUMBLE

Better

than

49

dB

(DIN

A),

70

dB

(DIN

B)

TONE

ARM

Static

balanced

type

with

Anti-skating

Adjuster

ARM

LENGTH

220

mm

STYLUS

PRESSURE

ADJUSTMENT

RANGE

|

0

to

3

grams

APPLICABLE

CARTRIDGE

WEIGHT

4

to

12

grams

ARM

LIFTER

Oil-damped

OVERHANG

|

15

mm

OFFSET

ANGLE

22°30'

HORIZONTAL

TRACKING

ERROR

ANGLE

+2°

SHELL

WEIGHT

i

7.8

grams

POWER

REQUIREMENTS

120V,

60

Hz

for

U.S.A.

and

Canada

220V,

50

Hz

for

European

countries

240V,

50

Hz

for

U.K.

and

Australia

110

to

120V,

220

to

240V

switchable

50/60

Hz

for

other

countries

DIMENSIONS

440(W)

x

158(H)

x

350(D)

mm

WEIGHT

T

81kg

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

2.

MODEL

AP-307

TURNTABLE

314

mm

aluminium

alloy

die-cast

DRIVE

SYSTEM

Quartz

Lock

Direct

Drive,

Fully

Automatic

MOTOR

DC

Servo

Motor,

Geared

Motor

for

Tone

Arm

drive

SPEED

&

PITCH

CONTROL

33-1/3

and

45

rpm

42.5%

SPEED

ACCURACY

1,000

Hz

+0.08%

WOW

AND

FLUTTER

0.035%

(DIN),

0.025%

(JIS)

RUMBLE

Better

than

49

dB

(DIN

A),

70

dB

(DIN

B)

MOMENT

OF

INERTIA

230

kg.cm?

TONE

ARM

Static

balanced

type

with

Anti-skating

Adjuster

ARM

LENGTH

220

mm

STYLUS

PRESSURE

ADJUSTMENT

RANGE

0

to

3

grams

APPLICABLE

CARTRIDGE

WEIGHT

4

to

12

grams

ARM

LIFTER

Oil-damped

OVERHANG

15

mm

OFFSET

ANGLE

22°30'

HORIZONTAL

TRACKING

ERROR

ANGLE

+2°

SHELL

WEIGHT

7.8

grams

POWER

REQUIREMENTS

120V,

60

Hz

for

U.S.A.

and

Canada

220V,

50

Hz

for

European

countries

240V,

50

Hz

for

U.K.

and

Australia

110

to

120V,

220

to

240V

switchable

50/60

Hz

for

other

countries.

DIMENSIONS

440(W)

x

158(H)

x

350(D)

mm

WEIGHT

8.6

kg

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

i.

DISMANTLING

OF

UNIT

-

3

TURNTABLE

In

case

of

trouble,

etc.

necessitating

dismantling,

please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

___|

—

BOTTOM

COVER

\

DUST

COVER

~

hn

qg

f

SCREWS

CARTRIDGE

TABLE

SHEET

NOTE:

Photos

of

dismantling

are

those

of

AP-307,

but

the

order

applies

to

AP-207

also.

iil,

CONTROLS

1.

MODEL

AP-207

ae

N=

0

0.8

MN:

DP

O'e

WUN

>

MEDEA

DW

OOOOU®

©

HINGE

TURNTABLE

PLATTER

SPINDLE

TONE

ARM

LIFTER

POSITION

FOR

45

rpm

ADAPTOR

STYLUS

PRESSURE

SCALE

RING

HINGE

MAIN

WEIGHT

ANTI-SKATING

ADJUSTOR

TONE

ARM

LIFTER

LEVER

¥

UP

¥

DOWN

.

DISC

SIZE

SELECTOR/MANUAL

.

START/CUT

REPEAT

LEVER

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

23.

24,

Fig.

1

LOCKING

NUT

CARTRIDGE

SHELL

FINGER

LEVER

CARTRIDGE

SHELL

TONE

ARM

TONE

ARM

REST

RUBBER

MAT

OVERHANG

ADJUSTMENT

SCALE

STROBE

MARKINGS

33

rpm

PITCH

CONTROL

45

rpm

PITCH

CONTROL

33/45

rpm

SPEED

SELECTOR

33

-m

45

-=

BUILT-IN

STROBE

LIGHT

2.

MODEL

AP-307

eee

N

>

Oo

0

OR

OL

i

Ne

HINGE

TURNTABLE

PLATTER

SPINDLE

TONE

ARM

LIFTER

POSITION

FOR

45

rpm

ADAPTOR

STYLUS

PRESSURE

SCALE

RING

HINGE

MAIN

WEIGHT

ANTI-SKATING

ADJUSTER

TONE

ARM

LIFTER

LEVER

¥

UP

©

DOWN

.

DISC

SIZE

SELECTOR/MANUAL

.

START/CUT

REPEAT

LEVER

13,

14,

15.

16.

17.

18.

19.

20.

21.

22.

23.

24.

Fig.

2

LOCKING

NUT

CARTRIDGE

SHELL

FINGER

LEVER

CARTRIDGE

SHELL

TONE

ARM

REST

TONE

ARM

RUBBER

MAT

OVERHANG

ADJUSTMENT

SCALE

STROBE

MARKINGS

PITCH

CONTROL

SWITCH

QUARTZ

LOCK

SWITCH

33/45

rpm

SPEED

SELECTOR

SWITCH

BUILT-IN

STROBE

LIGHT

IV.

PRINCIPAL

PARTS

LOCATION

1.

MODEL

AP-207

POWER

SUPPLY

PRC

BOARD

(AP

-

2641)

t

POWER

TRANS

PHONO

RC

BOARD

(AP-0319)

(T901)

D.D

RC

BOARD

(AP-2642)

{9

fr

aN

a

MOTOR(DDM~-33D)

Mh

saPan

sh

ay

save

:

bes

AUTO

MECHA

BLK

MICRO

SWITCH

sw902,SW903

TIMING

MOTOR

MICRO

SWITCH

NEON

LAMP

PC

BOARD

(AP-

2643)

Sw90l,

SW904

START

CAM

Fig.3

Bottom

View

2.

MODEL

AP-307

POWER

SUPPLY

RC

BOARD

(AP-

2641)

pa

POWER

TRANS

PHONO

P.C

BOARD

(AP-

0319)

(T901)

D.D

RC

BOARD

(AP-2642

)

AUTO

MECHA

BLK

MOTOR

(DDM-33D)

MICRO

SWITCH

Sw902

,SW903

TIMING

MOTOR

MICRO

SWITCH

SW90!,

SW904

NEON

LAMP

RC

BOARD

(AP-2643)

PLL

RC

BOARD

(AP-3601)

START

CAM

Fig.4

Bottom

View

Vv.

BLOCK

DIAGRAM

a

SS

ee

1.

MODEL

AP-207

WAVE

MULTI

corre!

PLIER

-CTION)

(2f)

33-1/3

f

=20Hz

45

f=27Hz

+B

45

———

33-1/3

SPEED

SELECTOR

Fig.

5

2.

MODEL

AP-307

STROBE

CIRCUIT

4.42368MHz

ie

COUNT

DOWN{—>

COUNT

DOWN

COMPARATON

SPEED

QUATZ

Sis

& &

ISeLector

tock

|

4 § o

+B

i

SCHMITT

tS

2S

33-1/3

=

45

ON—=——

OFF

=

TRIGGER

B23

=

R90

LPF

PITCH

CONTROL

Sad

Lea

ELEME

33-1/3

f220H2

45.

t227Hz

|

amp

|

CLAMP

BAFFER

N

HOLE

ee

‘

ELEMENT

\

Nee

oe

ii

ea

ia.

et

tm

le

a

rp

oe

as

leh

fi

ee

es

ee

oe

ee

Fig.

6

VI.

CIRCUIT

OPERATION

1.

NAND

EXCLUSIVE

OR

GATE

(=ANTI~COINCIDENCE)

De

o>

BD

+e

GENERAL

The

AP-207

has

a

D.D

(Direct

Drive)

P.C

Board

(AP-2642)

that

contains

a

FG

(Frequency

Generator)

the

signal

output

of

which

controls

the

motor.

The

AP-307

has

a

PLL

(Phase-Locked

Loop)

P.C

Board

(AP-3601)

in

addition

to

the

electrical

circuit

in

the

AP-207.

The

PLL

Circuit

in

the

AP-307

consists

of

a

Quartz

Lock

Circuit

and

a

Stroboscope

Circuit.

The

strobe-

scope

circuit

flashes

the

neon

tube

NE901

in

synchronism

with

the

frequency

to

which

the

crystal

oscillator

frequency

is

accurately

counted

down,

while

the

neon

tube

NE901

in

the

AP-207

is

activated

by

the

line

power

to

flash

the

stroboscope

patterns

on

the

turntable.

.

SERVO

CIRCUIT

1)

Operation

when

the

Quartz

Lock

Switch

SW903

is

OFF

(Refer

to

the

D.D.

Circuit

schematic

diagram

of

the

AP-307.)

The

motor

incorporates

a

FG

coil

that

produces

FG

signal

as

the

motor

rotates.

The

FG

signal

frequency

is

20

Hz

for

33-1/3

rpm

and

27

Hz

for

45

rpm.

The

FG

signal

is

magnified

through

IC1

(4

to

8).

The

magnified

FG

signal

is

clamped

to

positive

side

by

R40

and

VR1,

and

enters

IC2

@.

In

IC2,

the

signal

is

waveform-shaped

and

fre-

quency-doubled.

The

doubled

signal

is

fed

to

IC3

@),

as

an

input

to

Mono

Multi.

The

Mono

Multi

provides

a

characteristic

that

its

stable

state

is

inverted

by

an

external

trigger

into

the

unstable

state,

where

it

remains

for

a

predeter-

mined

time

before

returning

to

the

original

stable

state.

The

pulse

output

of

Mono

Multi

IC3

@

is

smoothed

by

C7

to

DC

which

is

led

to

IC1

@

as

the

voltage

to

be

compared.

When

the

Quartz

Lock

Switch

SW903

is

off,

a

reference

voltage

is

applied

to

IC1

@.

The

voltage

at

IC1

@

is

compared

with

the

reference

voltage

at

IC1

@),

and

the

output

appears

at.

IC1

@.

The

output

at

IC1

@

is

passed

through

the

phase

correction

circuit,

consisting

of

Fig.

7

C9

thrrough

C11

and

R18

through

R20,

to

TRI.

TR1

makes

current

flow

through

the

Hall

Elements

H1

and

H2,

which

are

installed

in

posi-

tion

under

the

rotor

magnet

of

the

motor.

The

voltage

developed

across

each

Hall

element

is

in

proportion

to

the

current

flowing

through

the

Hall

Elements

and

the

strength

of

the

magnetic

field

of

the

rotor

magnet.

The

voltages

output

of

the

two

Hall

elements

are

supplied

to

the

motor

drive

amplifier,

consisting

of

IC4

(4

to

8),

TR2

and

TR3

and IC4

(1

to

3),

TR4,

and

TRS,

to

control

motor

speed.

If

the

motor

speed

is

made

late

by

some

cause,

the

FG

signal

frequency

becomes

lower.

The

width

of

the

pulse

output

of

the

IC3

Mono

Multi

becomes

wider.

This

increases

the

comparison

voltage

at

IC1

@,

which

in

turn

raises

the

voltage

output

of

IC1

@.

The

result

is

an

increase

of

the

current

flowing

through

TRI

and

the

Hall

elements

Hi

and

H2.

The

current

increase

the

motor

drive

amplifier

so

as

to

make

the

motor

speed

fast.

2)

Operation

when

the

Quartz

Lock

Switch

SW903

is

ON

(Refer

to

the

PLL

Circuit

schematic

diagram

of

the

AP-307)

The

4.42368

MHz

signal

generated

by

the

crystal

oscillator

is

delivered

through

TP-1

to

IC2

@).

The

Flip-Flop

in

IC2

halves

the

oscillation

frequency

of

4.42368

MHz.

The

frequency-halved

signal

is

delivered

as

a

clock

pulse

to

IC3

@,

which

counts

it

down

to

1/27

(81.920

Hz)

for

33-1/3

rpm

or

1/20

(110.592

Hz)

for

45

rpm

according

as

set

by

the

Speed

Selector

Switch

SW902.

The

count-

down

signal,

which

appears

at

IC3

QQ,

is

further

counted

down

to

20

Hz

for

33-1/3

rpm

or

27

Hz

for

45

rpm

at

IC4

@.

This

output

signal

of

IC4

@®

enters

the

comparison

circuit

in

ICS

@,

asa

set

pulse.

On

the

other

hand,

the

FG

signal

fed

through

the

D.D

circuit

to

the

PLL

circuit

is

waveform-shaped

by

the

Schmitt

trigger

in

IC1

(10

to

13),

and

is

fed

through

IC1

@,

and

R3

to

ICS

as

the

reset

Akai AP-207 Manuale utente

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