Akai AC-M2 Manuale utente

STEREO

DECK

RECEIV

BAND.

FMMUTE

MODE

SPEAKER

PHONES

TAGE

METAL

REM

AUTO

ON:

MONO

OFF

move.

AC-M2

—

STEREO

DECK

RECEIVER

wove

AC-M2

SECTION

SERVICE

MANUAL

SECTION

PARTS

DEST

ins

heath

aie

oor

aren

eae,

AG)

SECTION

SCHEMATIC

DIAGRAM

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

SAFETY

INSTRUCTIONS

SAFETY

CHECK

AFTER

SERVICING

Confirm

the

specified

insulation

resistance

between

power

cord

plug

prongs

and

externally

exposed

parts

the

set

greater

than

Mohms,

but

for

equipment

with

external

antenna

terminals

(tuner,

receiver,

etc.)

and

intended

for

[A],

specified

insulation

resistance

should

than

2.2

Mohms

(ground

terminals,

microphone

jacks,

headphone

jacks.

line-in-out

jacks

etc.)

PRECAUTIONS

DURING

SERVICING

eND

Parts

identified

the

symbol

parts

are critical

for

safety.

Replace

only

with

parts

number

specified.

addition

safety,

other

parts

and

assemblies

are

specified

for

conformance

with

such

regulations

those

applying

spurious

radiation.

These

must

also

replaced

only

with

specified

replacements.

Examples:

converters,

tuner

units,

antenna

selector

switches,

cables,

noise

blocking

capacitors,

noise

blocking

filters,

etc.

Use

specified

internal

wiring.

Note

especially:

Wires

covered

with

PVC

tubing

Double

insulated

wires

High

voltage

leads

Use

specified

insulating

materials

for

hazardous

live

parts.

Note

especially:

Insulation

Tape

PVC

tubing

Spacers

(Insulating

Barriers)

Insulation

sheets

for

transistors

Plastic

screws

for

fixing

microswitch

(especially

turntable)

When

replacing

primary

side

components

(transformers,

power

cords,

noise

blocking

capacitors,

etc.),

wrap

ends

wires

securely

about

the

terminals

before

soldering.

Observe

that

wires

not

contact

heat

producing

parts

(heatsinks,

oxide

metal

film

resistors,

fusible

resistors,

etc.).

Check

that

replaced

wires

not

contact

sharp

edged

pointed

parts.

Also

check

areas

surrounding

repaired

locations.

Use

care

that

foreign

objects

(screws,

solder

droplets,

etc.)

not

remain

inside

the

set.

Voltage

Conversion

and

Best

Selector

Voltage

Conversion

Models

for

Japan,

Canada,

USA,

Europe,

and

Australia

are

not

equipped

with

this

facility.

Each

machine

preset

the

factory

according

destination,

but

some

machines

can

set

110V—120V

220—240V

required.

your

machine’s

voltage

can

converted:

1-1)

Disconnect

the

power

cord.

1-2)

Remove

the

cover

plate.

1-3)

Move

the

Voltage

Selector

located

the

rear

panel

with

screwdriver.

that

the

marker

below

the

voltage

for

your

area.

(Refer

Fig.

Cycle

Conversion

With

motor

cycle

conversion

not

necessary.

VOLTAGE

SELECTOR

220-240V

H10-120V

Fig.

VI.

VIL.

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

SPECIFICATIONS

2... 2...

cece

eee

teeter

tence

eneene

DISMANTRING

UNIT

0...

eee

CONTROES

tare.

Scheele

ide

alee

aes

Dae

telette

BaF

Wye

ene

eae

ele

PRINCIPAL

PARTS

LOCATION

............0000

cece

eeeenees

MECHANICAL

ADJUSTMENT

.........

0.00.

eee

5-1.

PINCH

ROLLER

PRESSURE

MEASUREMENT

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

5-2.

WINDING

TORQUE

MEASUREMENT

EACH

MODE

..........

5-3.

TAPE

SPEED

ADJUSTMENT

.......

0...

0.00.0

5-4.

DIAL

CORD

STRINGING...

0...

eee

ELECTRICAL

ADJUSTMENT

.....

0.0.0...

eee

6-1.

AM(MW)

ADJUSTMENT

...........

0...

eee

6-2.

SECTION

ADJUSTMENT

...........

00.00.02

eee

6-3.

CASSETTE

DECK

SECTION

ADJUSTMENT

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

CLASSIFICATION

VARIOUS

P.C

BOARDS

................05-

7-1.

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS.........

7-2.

COMPOSITION

VARIOUS

P.C

BOARDS

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

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

GENERAL

TECHNICAL

MANUAL.

SERVICE

MANUAL

AC-M2

SPECIFICATIONS

TUNER

SECTION

TUNING

FREQUENCY

RANGE

87.6

108

MHz

USABLE

SENSITIVITY

(HF)

17.2

dBf

QUIETING

SENSITIVITY

(S/N=504dB)

Mono/ST

23.2

dBf/43.2

dBf

SELECTIVITY

(400

kHz)

IMAGE

REJECTION

SPURIOUS

REJECTION

SUPPRESSION

S/N

(Mono/ST)

dB/60

T.H.D.

(Mono/ST)

STEREO

SEPARATION

kHz)

TUNER

SECTION

0.3%/0.4%

TUNING

FREQUENCY

RANGE

525

1,605

kHz

USABLE

SENSITIVITY

(IHF)

500

wV/m

SELECTIVITY

IMAGE

REJECTION

S/N

T.H.D.

DECK

SECTION

TRACK

SYSTEM

TAPE

SPEED

MOTOR

HEADS

WOW

FLUTTER

TAPE

WINDING

TIME

FREQUENCY

RESPONSE

S/N

T.H.D.

POWER

AMPLIFIER

SECTION

1.5%

Track

2-Channel

Stereo

System

4.76

cm/s

(1-7/8

ips)

Electronically

Controlled

Motor

High

Density

Metallic

Rec/Play

Head

Erase

Head

0.07%

(WRMS)

sec

Using

C-60

Tape

NORMAL

13,000

(+3

dB)

CrO,

14,000

(+3

dB)

METAL

15,000

(+3

dB)

Dolby

ON:

Improves

above

kHz

(Metal

tape)

RATED

POWER

OUTPUT

channels

Driven)

S/N

RESIDUAL

NOISE

ohms)

18W/0.5%

kHz,

ohms)

PHONO

AUX

0.5

CHANNEL

SEPARATION

(IHF,

kHz)

APPLICABLE

SPEAKER

IMPEDANCE

ohms

PRE-AMPLIFIER

SECTION

IMPUT

SENSITIVITY/IMPEDANCE

PHONO

mV/47

kohms

AUX

300

mV/47

kohms

MIC

1.6

mV/4

kohms

FREQUENCY

RESPONSE

PHONO

(RIAA

Deviation)

kHz

+0.5

AUX

kHz

+0,

—3

TONE

BOOST

BASS

(100

Hz)

TREBLE

(10

kHz)

POWER

REQUIREMENT

120V,

for

USA

Canada

POWER

CONSUMPTION

220V,

for

Europe

except

240V,

for

Australia

110—120V/220—240V,

Hz/60

switchable

for

other

countries.

150W

DIMENSIONS

350(W)

127(H)

365(D)

(13.8

14.4

inches)

WEIGHT

6.3

(13.9

lbs)

For

improvement

purposes,

specifications

and

design

are

subject

change

without

notice.

Dolby

and

the

Double

symbol

are

trade

marks

Dolby

Laboratories.

(Manufactured

under

license

from

Dolby

Laboratories.)

SERVICE

MANUAL

AC-M2

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

dismantling,

please

dismantle

the

order

shown

the

photographs.

Reassemble

reverse

order.

BOTTOM

COVER

SCREWS

UPPER

COVER

SCREWS

SERVICE

MANUAL

AC-M2

lil.

CONTROLS

OnNaanrewn

OOM

OAH

OUTLET

UNSWITCHED:

220-2404-—

190-120.

110~120¥/220-~

2409

50/GOHz

150W

WARHING

SHOCK

HAZARO-D0

NO”

PEN!

AVIS:

RISQUE

CHOC

ELECTRIO®

PAS

OUYRIR!

NICHT

GFFRENS-

Fig.

3-2

Rear

Side

EJECT

BUTTON

17.

MUTE

SWITCH

POWER

SWITCH

18.

MODE

SELECTOR

CASSETTE

HOLDER

19.

SPEAKER

SWITCH

TONE

(BASS)

CONTROL

20.

PHONES

JACK

TAPE

COUNTER

and

RESET

BUTTON

21.

TUNING

CONTROL

TONE

(TREBLE)

CONTROL

22.

LOOP

ANTENNA

TERMINAL

BALANCE

CONTROL

23.

ANTENNA

TERMINAL

VOLUME

CONTROL

24.

PHONO

JACKS

TUNING

DIAL

SCALE

and

INDICATOR

25.

AUX

JACKS

LOUDNESS

SWITCH

26.

SPEAKER

TERMINALS

OPERATION

BUTTONS

27.

CORD

Mic

JACK

28..

OUTLET

TAPE

SELECTORS

(Normal,

CrO,,

METAL)

29.

VOLTAGE

SELECTOR

(

|U}

Model

only)

DOLBY-NR

SWITCH

30.

BEAT

SELECTOR

INPUT

SOURCE

SELECTORS

(TAPE,

PHONO,

AUX)

31.

LOOP

ANTENNA

BAND

SELECTORS

SERVICE

MANUAL

AC-M2

IV.

PRINCIPAL

PARTS

LOCATION

TREBLE

CONTROL

VOLUME

BASS

CONTROL

VOLUME

BALANCE

CONTROL

VOLUME

COUNTER

VOLUME

CONTROL

VOLUME

POWER

SWITCH

LED

PCB

LOUDNESS

SWITCH

PLAY

SWITCH

RWD

SWITCH

22193679(OTHERS)

TUNING

SHAFT

22193716

VOLUME

PCB

22193676

(OT

HERS)

22193713

JACK

PEAKER

(ON/OFF)

SWITCH

ERASE

HEAD

MIC

JACK:

MODE

(AUTO/MONO)SWITCH

TAPE

SELECTOR

SWITCH

MUTE

SWITCH

{NORMAL

CrO2,METAL

)

BAND

SELECTOR

SWITCH

(FM/AM)

DOLBY

SWITCH

INPUT

SOURCE

SELECTOR

SWITCH

(TAPE,PHONO,AUX

)

EJECT

BUTTON

REC/PB

HEAD

Fig.

4-1

Front

View

BEAT

PCB

SPEAKER

PCB

OTHERS)

selaci4

22193714

OUTLETS

22193715

PHONO

PCB

22193680

(OTHERS)

22193717

[Al

POWER

TRANSFORMER

SWITCH

PCB

22193674

22i937I1

[Aj[C]

22193697

[Ss]

MAIN

PCB

POWER

SWITCH

22193675

(OTHERS)

22193712

[A)[C]

MOTOR

PAUSE

SWITCH

Fig.4-2.

Top

View

SERVICE

MANUAL

AC-M2

MECHANICAL

ADJUSTMENT

5-1.

PINCH

ROLLER

PRESSURE

MEASUREMENT

(Refer

Fig.

5-1)

PINCH

ROLLER

Put

PLAY

mode,

push

pinch

roller

arm

down

with

the

spring

gauge,

push

the

pinch

roller

1~2

from

the

capstan

and

release

slowly.

Read

the

spring

gauge

the

moment

the

pinch

roller

touches

the

capstan

5-2.

WINDING

TORQUE

MEASUREMENT

EACH

MODE

(Refer

Fig.

5-2)

CASSETTE

TORQUE

METER

OQH)\VO

Fig.5-2

Cassette

Torque

Meter

Insert

cassette

torque

meter

(AJ-751179)

and

mea-

sure

each

mode.

For

fast

forward

and

rewind

measure

the

end

the

tape

has

stopped

running.

Forward

play:

g-cm

Fast

Forward,

Rewind:

160

g-cm

SPRING

GAUGE

}

300

500gtm

PINCH

ROLLER

SPRING

Fig.

5-1

and

begins

rotate.

Specified,

contact

pressure

measurement

300

500

grm.

there

measurement

obtained,

replace

the

pinch

roller

spring.

5-3.

TAPE

SPEED

ADJUSTMENT

(Refer

Fig.

5-3)

TAPE

SPEED

ADJUSTMENT

VOLUME.

Fig.

5-3.

Connect

frequency

counter

line

output

terminal.

Playback

1,000

pre-recorded

test

tape

(AT-

750774)

3150Hz,

Pre-recorded

test

tape

(AT-751263),

and

adjust

the

tape

speed

adjustment

volume

obtain

tape

speed

1000

1.0%,

3150

1.0%.

SERVICE

MANUAL

AC-M2

5-4.

DIAL

CORD

STRINGING

CEMENT

AFTER

ONE

TIE

APPROX

425mm

eveuer

—

CRUSH

FLAT

SPRING

Fig,

5-4

Set

the

tuning

capacitor

the

maximum

capaci-

tance

(fully

counterclockwise

position).

Wind

the

dial

cord

the

numerical

sequence

shown

Fig.

5-4.

service

MANUAL

AC-M2

————_————____

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