Akai AP-002 Manual de usuario

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1

:

-AKAI

SEMLAUTOMATIC

1

Th

woo

AP=-OO2

—

ALSO

APPLICABLE

To

MODEL

AP-OG2D

4

So

7

“

SEMI-AUTOMATIC

TURNTABLE

moveL

AP

-002

ALSO

APPLICABLE

TO

MODEL

AP-002D

SECTION

1

SERVICE

MANUAL

..............020

0204

3

SECTION

2

PARTS

LIST

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

0.00

eee

eee

ee

BI

Il.

IH.

IV.

VI.

VII.

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

SPECIFICATIONS

®

ices

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ele

an

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ed

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4

DISMANTLING

OF

UNIT

..

0.2.0.0

eee

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tee

teen

ee

eee

5

AUTOMATIC

RETURN

MECHANISM

.......

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teens

6

1.

AUTOMATIC

RETURN

2...

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9

2.

INOPERATIVE

PITCH

1.0...

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10

3.

FORCE

(MANUAL)

CUT...

6

ee

ee

ee

ee

es

10

VARIOUS

ADJUSTMENT

.........

ccc

cee

eee

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tees

19

(1)

RETURN

POSITION

ADJUSTMENT

..

10...

0.

cece

ee

eee

ee ee

eee

20

(2)

CYCLE

CHANGE

(MOTOR

PULLEY

CHANGE)

.........

0.0

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ee

res

20

PLAYER:

CARE

69:68

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Slee

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EE

21

1,

LIFE

OF

NEEDLE

(STYLUS

TIP)

2.0...

0.

ee

ee

es

21

2.

NEEDLE

CHANGE

...

1...

ce

ce

te

ee

tee

tee

eee

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21

3,

LUBRICATION:

fice

a

eo

eae

ed

Seed

a

ele

ee

PEER

OE

Sa

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mtg

ee

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Se

es

21

BLOCK

DIAGRAM

...

0...

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ee

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eee

tee

22

ADJUSTMENT

CHART

..

1.2...

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teen

24

Il.

SPECIFICATIONS

MODEL

AP-002

AP-002D

1,

TYPE

Belt

drive,

automatic

return

Belt

drive,

automatic

return

2.

CARTRIDGE

M.M

type,

APC-2

(VM)

M75B/2

3.

OUTPUT

VOLTAGE

2.2

to

4.4

mV,

2.2

to

6.0

mV

+

1000

Hz,

50

mm/sec

1000

Hz,

50

mm/sec

4,

FREQUENCY

RESPONSE

20

Hz

to

25,000

Hz

20

Hz

to

20,000

Hz

5.

CROSS

TALK

Better

than

15

dB,

Better

than

17

dB,

1,000

Hz

1,000

Hz

6.

OUTPUT

BALANCE

Within

3

dB

Within

2.5

dB

7.

COMPLIANCE

5

to

8x10

®cm/dyne

20x10

°cm/dyne

8.

STYLUS

PRESSURE

2.5

gr+15%

2.5

gr+15%

9.

STYLUS

TIP

0.5

mil

diamond

tip

(APN-2)

0.6

mil

diamond

tip

(N75B/2)

10.

TONE

ARM

Static

balanced

type

tubular

arm

with

Static

balanced

type

tubular

arm

with

in-

inside

force

canceller

and

lateral

balance

gide

force

canceller

and

lateral

balance

weight

weight

11.

MOTOR

4-pole

synchronous

motor

4-pole

synchronous

motor

12.

TURNTABLE

300

mm

aluminum

alloy

diecast

300

mm

aluminum

alloy

diecast

13.

REVOLUTIONS

33-1/3,

45

r.p.m.

33-1/3,

45

r.p.m.

14.

WOW

&

FLUTTER

Less

than

0.15%

Less

than

0.15%

15.

S/N

RATIO

Better

than

30

dB

Better

than

30

dB

16.

POWER

CONSUMPTION

Less

than

17W

Less

than

17W

17.

DIMENSIONS

|

442(W)x185(H)x377(D)mm

(17.4"°X7,3"'*14.8')

503(W)x185(H)x410(D)mm

(19.8°x7.3"x16.1"')

18.

WEIGHT

7

kg

(15.4

Ibs.)

8

kg

(17.6

Ibs.)

Il.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Re-

assemble

in

reverse

order.

TABLE

SHEET

SCREWS

MECH.

BLOCK

Loosen

thise

Screws

only

slightly

Hl.

AUTOMATIC

RETURN

MECHANISM

i

RETURN-LEVER

@)

CRANK-LEVER-ASSY.

(6)

STOPPER-GEAR(7)

MAIN-GEAR(3)

HOLDER-BALL

(8)

STEEL-BALL(7)

cLutcH-assy.(4)

SHAFT-ASsv.(1)

TRIP

(5)

PLATE-REVECT

(2)

POLE-REUECT

(15)

((2)MINI-Sw.

PLATE-PU-ASSY

(©)

PLATE-ELEvate

(8)

AUTO-LEVER

@3)Pick-uP-ARM

(4)

PLATE-REJECT

(13)

PLaTE-

JOINT

Fig.

2

MAIN

PARTS

OF

AUTOMATIC

MECHANISM

SOUND

GROOVE

TRANSPORT

GROOVE

WIDTH

BETWEEN

PERTORMDNCES.

LEAD-OUT

GROOVE

PITC

DIAMETER

OF

—>

LAST

GROOVE

DIAMETER

OF

———>

LAST

SOUND

GROOVE

The

return

mechanism

of

this

machine

is

as

shown

in

Fig.

2.

Because

of

the

use

of

“speed

displacement

type”

perception

equipment,

when

the

program

(performance)

ends,

and

the

pick

up

needle

advances

in

lead-out

groove,

the

perception

equipment

operates

regardless

of

disc

size

(in

case

of

JIS

specification

equivalent).

That

is

to

say

that

because

the

speed

displacement

type

perception

equipment

operates

with

100%

certainty,

the

proper

type

of

record

becomes

important.

There

are

several

different

specifications.

For

instance,

domestic

JIS,

and

foreign

IEC,

RIAA,

etc.,

but

this

machine

is

designed

to

operate

as

per

JIS

specifications.

Below

is

a

summary

of

JIS

record

dimensions

necessary

for

automatic

return.

Transport

groove:

If

transport

groove

diameter

is

within

230

mm,

and

this

pitch

or

transport

width

is

within

1

mm.

Lead-out

groove:

Lead-out

groove

pitch

is

4

to

9

mm

and

linkage

is

made

to

the

last

groove

at

more

than

one

revolution.

Last

groove:

Last

groove

is

always

linked

from

lead-out

groove

at

concentric

circle.

RECORD

TYPE

17

cm

17

cm

25

cm

30

cm

HEADING

45

r.p.m.

33

r.p.m.

Last

Sound

Groove

Diameter

More

than

106

More

than

106

More

than

115.2

|

More

than

115.2

|Last

Groove

Diameter

97+1

9741

|

106.4+0.8

106.440.8

A

gear

the

same

as

the

pitch

of

MAIN

GEAR

(3)

is

installed

to

the

SHAFT

TABLE

ASSY

(1)

and

here

a

plectrum-like

part

projects

from

this

part.

Because

this

plectrum

is

for the

purpose

of

picking

up

the

timing

of

CLUTCH-ASSY

(4)

installed

on

the

MAIN-GEAR

(3)

it

rotates

with

the

turntable

during

record

performance.

AUTO

LEVER

(9)

is

linked

to

the

PLATE-PU-ASSY

(10)

which

is

directly

connected

to

the

pick

up

arm,

and

TRIP

(5)

begins

to

be

pressed

from

about

the

time

stylus

tip

reaches

the

lead-out

groove.

The

move-

ment

of

this

AUTO-LEVER

(9)

is

about

1/6

in

relation

to

the

movement

of

the

stylus

tip.

RETURN

LEVER

(11)

is

linked

to

MAIN

GEAR

(3)

by

CRANK

LEVER

ASSY

(13)

and

reciprocal

motion

is

in

accordance

with

MAIN

GEAR

(3)

revolutions.

Then

at

the

““”slanted

portion

(hatching),

PLATE

ELEVATOR

(16)

is

raised

and

the

lifter

(at

@

mark

position)

is

elevated

and

the

arm

returned

to

the

arm

rest.

Further,

because

current

ON-OFF

switch

MINI-

SW

(12)

is

installed

on

RETURN

LEVER

(11),

this

switch

operates

to

automatically

stop

turn

table

rota-

tion

when

the

pick

up

arm

is

returned

to

the

arm

rest.

Because

STOPPER

GEAR

(7)

controls

the

revolving

motion

of

MAIN

GEAR

(3),

it

operates

to

stop

rota-

tion

so

that

the

tooth

gap

part

comes

to

a

standstill

at

an

established

position

near

TABLE

SHAFT

ASSY

Q).

Also

in

case

the

record

is

stopped

during

performance,

PLATE,

JOINT

(13),

PLATE

REJECT

(14)

and

POLE

REJECT

(15)

are

intervened

by

the

forward

motion

of

CAM

REJECT

LEVER,

PLATE

REJECT

(2)

oper-

ates,

and

CLUTCH

ASSY

(4)

is

pushed

out.

1.

AUTOMATIC

RETURN

As

shown

in

Fig.

3

when

the

pick

up

arm

moves

to

the

record

surface,

the

PLATE-PU

ASSY

(10)

which

is

directly

connected

to

the

arm

shaft

separates

from

MINI

SW

(12),

power

source

is

turned

ON,

and

the

turntable

rotates.

As

the

pick

up

stylus

tip

traces

the

recorded

groove

of

the

record,

AUTO

LEVER

(9)

also

advances

on

the

inner

side

proportionately.

Be-

cause

this

AUTO

LEVER

advances

as

the

STEEL

BALL

(17)

on

HOLDER

BALL

(8)

rolls,

movement

is

ex-

tremely

smooth

and

there

is

almost

no

influence

extended

to

pick

up

arm

side

pressure.

In

due

time

the

pick

up

stylus

finishes

sound

groove

tracing

and

about

the

time

it

enters

the

lead-out

groove,

the

tip

of

AUTO-LEVER

(9)

begins

to

push

the

skirt

part

of

TRIP

(5)

and

the

CLUTCH

ASSY

(4)

which

rides

lightly

on

this

part

is

pushed

out

toward

the

TABLE

SHAFT

ASSY

(1)

(shown

in

Fig.

5,

when

the

pick

up

stylus

is

at

a

about

126

mm

position

from

the

turntable).

At

this

condition,

the

protruding

part

of

the

gear

on

TABLE

SHAFT

ASSY

(1)

is

drawn

to

CLUTCH

ASSY

(4)

and

the

MAIN

GEAR

begins

to

rotate

(Fig.

6).

Up

to

now

MAIN

GEAR

(3)

had

been

held

it

a

standstill

by

STOPPER

GEAR

(7)

and

a

smooth

stop

effected

by

the

teeth

gap,

but

when

the

condition

in

Fig.

6

is

assumed

the

teeth

begin

to

mesh

together

and

rotating

motion

begins.

Then

as

shown

in

Fi.

7,

this

motion

by

means

of

CRANK

LEVER

ASSY

(6)

moves

RETURN

LEVER

(11)

in

the

direction

of

the

arrow,

and

PLATE

ELEVATOR

(16)

is

raised

and

the

lifter

is

elevated.

When

pick

up

arm

elevatin

is

complete,

as

shown

in

Fig.

8,

the

part

indicated

by

broken

line

of

RETURN

LEVER

(11)

hits

the

cunion

part

attached

to

the

tip

of

PLATE

PU

ASSY

(10)

and

pick

up

arm

return

commences.

When

the

piick

up

arm

returns

to

the

rest,

the

RETURN

LEVER(#1)

by

means

of

CRANK

LEVER

(6)

moves

in

the

oppsite

direction

(broken

arrow

mark),

PLATE

PU

ASSY

(10)

returns

to

former

position,

and

in

due

car

rse

approaching

MINI

SW

(12)

is

operated

and

the

pwer

source

is

turned

OFF

so

that

the

condition

in

Fg.

3

is

re-assumed.

a

9

2.

INOPERATIVE

PITCH

As

can

be

seen

by

the

JIS

specification

summary

above,

record

sizes

entail

3

kinds

of

specifications,

and

these

are

classified

into

2

categories

which

are

directly

related

to

automatic

return.

These

are

17

cm

and

25/30

cm

dimensions.

For

perception

of

return

position

of

there

two

kinds

of

records,

in

the

case

of

in-

operative

part

of

gear

(less

than

1

mm)

the

operating

principle

of

the

perception

equipment

is

as

follows:

On

a

17

cm

record

the

last

sound

groove

trace

is

in

the

vicinity

of

110%.

However,

on

a

30

cm

record

the

sound

groove

has

already

ended

at

the

vicinity

of

110%

and

the

stylus

has

passed

the

lead-out

groove

and

is

moving

to

the

last

groove

(concentric

circle)

at

about

this

time

(1.8

mm

radius).

Therefore,

when

the

pick

up

arm

comes

to

this

vicinity,

if

it

is

a

30

cm

record,

return

operation

must

com-

mence,

and

if

it

is

a

17

cm

record,

the

last

trace

must

yet

be

effected.

The

difference

in

circumstances

of

these

two

records

lie

in

the

volume

of

movement

of

the

stylus

advancement

within

one

single

revolution.

In

the

case

of

a

17

cm

record,

because

this

pitch

is

very

limited

(less

than

1

mm),

it

is

satisfactory

if

the

CLUTCH

ASSY

is

kicked

back

by

the

protruding

part

of

the

TABLE

SHAFT

ASSY

as

shown

in

Fig.

10

each

time

the

record

makes

one

revolution.

For

details

of

this

kicked

back

condition,

refer

to

Fig.

11.

The

gamma

(y)

(kick

back

volume)

is

about

0.6

m/m

and

on

a

17

cm

record

even

with

a

transport

pitch

of

1

mm,

the

CLUTCH

ASSY

cannot

retrieve

this

kicked

back

portion.

Regardless

of

how

many

times

the

record

rotates,

the

transport

pitch

is

less

than

1

mm

and

the

clutch

assembly

continues

to

be

kicked

back.

(Fig.

12)

(Even

if

the

record

is

traced

to

about

97%

vicinity

(outside

of

specifications),

if

the

transport

pitch

is

less

than

1

mm,

return

will

definitely

not

be

effected

during

the

performance),

(this

occurs

only

when

the

TRIP

is

pushed).

However,

because

practically

all

marketed

records

are

JIS

ox

equivalent,

when

the

stylus

advances

to

about

106%

vicinity

and

moves

to

the

lead-out

groove,

the

transport

pitch

suddenly

increases

(4

to

9

mm).

When

this

happens,

the

CLUTCH

ASSY

movement

which

to

now

could

not

retrieve

the 0.6

mm

kick

back

volume

suddenly

is

increased

(over

1.2

mm),

and

on

the

next

revolution

when

the

protruding

part

ap-

proaches,

meshing

takes

place

and

return

begins.

In

this

manner

the

“speed

displacement

type

return

mechanism

utilizes

the

operating

pitch

and

regardless

of

whether

the

record

is

17

cm

or

30

cm,

return

is

effected

at

the

end

of

record

performance.

10

3.

FORCE

(MANUAL)

CUT

When

listening

to

a

record

and

you

wish

to

stop

in

the

middle

of

a

performance,

or

when

playing

a

record

not

according

to

specifications,

and

the

stylus

tip

has

advanced

to

the

last

groove,

simply

bring

the

cut

lever

forward.

This

moves

PLATE

REJECT

2

which

pushes

PLATE

JOINT

(13),

then

POLE

REJECT

(15)

and

ultimately

CLUTCH

ASSY

(4)

is

pushed

as

shown

in

Fig.

13.

(=

mark).

Then

return

operation

commences

and

the

power

source

is

turned

OFF

(Refer

to

Item

1

above

and

Fig.

5).