Akai AS-8100 Manual de usuario

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%

TABLE

OF

CONTENTS

SPECIFICATIONS.

.......0..:ccceeceeee

ee

eee

tere

neta nese

ereen

ees

I.

DISMANTLING

OF

AMPLIFIERS

............-:.20::seeeeee

DISPOSITION

OF

P.C.

BOARD

I.

Il.

AS

WELL

AS

CONDENSER

OUTPUT

............0:205

TUNER

SECTION

ADJUSTMENT

.............:::cceeeeees

V.

V..

I

0

1

MAIN

AMPLIFIER

ADJUSTMENT

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

EPC

(ELECTRONIC

PROTECTION

VI.

CIRCUIT)

ADJUSTMENT

..........ccccceceeeee

erent

etee

ees

DISPOSITION

OF

EACH

ADJUSTMENT

kes

12

14

COMPOSITE

VIEWS

OF

COMPONENTS

..............-+5+

VI.

Vill.

When

placing

order

for

parts,

please

use

separate

PARTS

LIST.

1.

SPECIFICATIONS

An

asterisk

next

to

a

figure,

indicates

the

minimum

guaranteed

performance.

AMPLIFIER

SECTION

OUTPUT

MUSIC

POWER

OUTPUT

30

W

each

channel]

at

8

2,

4-channel

60

W

each

channel

at

8

2,

2-channel

RATED

POWER

OUTPUT

18

W

each

channel

at

8

2,

4-channel

40

W

each

channel

at

8

2,

2-channel

REC.

OUTPUT

Din:

25

mV

Pin:

150

mV

INPUT

SENSITIVITY

Phono:

3mV

AUx.:

150

mV

Tape

1,2:

150mV

FREQUENCY

RESPONSE

20

to

100,000

Hz

+

0/-3

dB

at

8

2

(20

to

50,000

Hz

+0/-1

dB

at

8

2*)

POWER

BAND

WIDTH

20

to

30,000

Hz

at

8

2

HARMONIC

DISTORTION

Less

than

0.1%

at

8

2

HUM

AND

NOISE

-48

dBm

SIGNAL

TO

NOISE

RATIO

Phono:

70

dB

(65

dB*)

Aux.:

80

dB

(75

dB*)

Tape:

80

dB

(75

dB*)

TONE

CONTROL

Base:

+10

dB

at

100

Hz

Treble:

+10

dB

at

10,000

Hz

LOUDNESS

CONTROL

+7

£2

dB

at

100

Hz

+4

+2

dB

at

10,000

Hz

FILTERS

High

Cut

Filter:

-9

£2

dB

at

50

Hz

-6

+2

dB

at

10,000

Hz

FM

TUNER

SECTION

FREQUENCY

RANGE

75

to

91

MHz

£800

KHz

(JAPAN)

87

to

109

MHZ

+800

KHz

(U.S.A.

and

S.

AFRICA)

IF

FREQUENCY

10.7

MHz

SENSITIVITY

Less

than

10

dB

HARMONIC

DISTORTION

Mono:

Less

than

0.5%

Stereo:

Less

than

0.8%

(1.0%*)

SIGNAL

TO

NOISE

RATIO

Better

than

60

dB

SELECTIVITY

Better

than

60

dB

(40

dB*)

IMAGE

INTERFERENCE

RATIO

Better

than

100

dB

(80

dB*)

IF

INTERFERENCE

RATIO

Better

than

100

dB

(90

dB*)

CAPTURE

RATIO

Better

than

1.5

dB

(2

dB*)

SPURIOUS

RATIO

Better

than

34

dB

MUTING

SENSITIVITY

20

+3

dB

SCA

INTERFERENCE

RATIO

Better

than

50

dB

SEPARATION

Better

than

35

dB

ANTENNA

INPUT

IMPEDANCE

300

2

balanced;

752

unbalanced

AM

TUNER

SECTION

FREQUENCY

RANGE

525

£5

KHz

to

1630

+15

KHz

IF

FREQUENCY

455

KHz

SENSITIVITY

Dummy:

Less

than

15

dB

Loop:

Less

than

46

dB

HARMONIC

DISTORTION

Less

than

1.5%

SIGNAL

TO

NOISE

RATIO

Better

than

50

dB

(40

dB*)

SELECTIVITY

30

dB

(20

dB*)

IMAGE

INTERFERENCE

RATIO

Better

than

70

dB

IF

INTERFERENCE

RATIO

Better

than

70

dB

TRANSISTORS

USED

4

.....2SA545

(M)

2

.....28C535

5

.....28C838

(H)

8

.....28C853

(M)

12.....2SC900

(F,

H)

3

.....28C945

(R)

1

.....28C968

(3)

2

.....28C1014

(D1,

D2)

8

.....28D313

1

.....SE3001

FET

USED:

1.....28K30

IC

USED:

2....LALI11

6.....LD3120

1.....A3300

DIODES

USED

6

.....IN34A

4

.....1N60

8.....10D1

1.....5B2

1....1RCS

Fees

1S337A

4....VD1211

THERMISTORS

USED:

4.....23D29

POWER

SUPPLY

100

V

to

240

V

AC,

50/60

Hz

U.S.A.:

117

V

AC,

60

Hz

as

per

U/L

POWER

CONSUMPTION

200

W

DIMENSIONS

487(W)

X

165(H)

X

346(D)

mm

(19%"

X

7"

X

14%")

WEIGHT

16

kg.

(35.3

lbs.)

ll.

DISMANTLING

OF

AMPLIFIERS

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Reassemble

in

reverse

order.

UPPER

COVER

LOWER

COVER

i.

DISPOSITION

OF

P.C.

BOARD

AS

WELL

AS

CONDENSER

OUTPUT

EQUALIZER

AMP.

oy

op

‘

mon

|

P.C.

BOARD

—.

‘

‘

coat

AM

IF

AMP.

P.C.

BOARD

MPX

AMP.

P.C.

BOARD

:

2a:

FRONT

END

:

awe

ns

(TUNER)

FM

IF

AMP.

:

bya

:

oe

P.C.

BOARD

i).

es

:

MAIN

AVE

P.C.

BOARD

a

POWER

TRANSFORMER

POWER

TRANSFORMER

PHASE

INVERTER

POWER

SUPPLY

AMP.

P.C.

BOARD

P.C.

BOARD

TONE

CONTROL

AMP.

P.C.

BOARD

VOLUME

CONTROL

P.C.

BOARD

IV.

TUNER

SECTION

ADJUSTMENT

1.

TERMINATION

PAD

(MODEL

2151-8)

FM

IF

CIRCUIT

ADJUSTMENTS

(See

Figs.

1

and

2)

FM

IF

PC.

BOARD

2).

3)

4)

5)

AM-FM

RADIO

IF

GENESCOPE

(MODEL

MSW~721C)

Fig.

1

10.7

MHz

Fig.

2

Adjust

V-Gain

Volume

to

obtain

a

2

cm

amplitude

of

0.3V

p-p

AM

FM

Radio

IF

Genescope

cali-

bration

voltage

on

screen

and

set

Genescope

Cutput

to

50

dB.

Connect

Genescope

Output

to

point

(1)

(FM

IF

Input),

and

Genescope

Input

to

point

(8)

(AF

Output).

Set

Mode

Switch

to

“FM”

and

set

dial

to

about

109

MHz

reception

frequency.

Adjust

the

upper

core

of

IFT

“L,”

of

FM

IF

Amp.

P.C.

Board

so

that

the

S

Curve

output

voltage

is

maximum.

Also

adjust

the

lower

core

to

obtain

optimum

S

Curve

linearity.

In

making

this

adjustment,

in

some

cases

the

rank

of

the

ceramic

filter

causes

a

discrepancy

in

the

S

Curve

Marker

Point,

but

it

is

satisfactory

if

through

adjustment

a

margin

of

within

+500

Hz

can

be

obtained

(See

Fig.

3).

Ceramic

Filter

Rank

Center

Frequency

|

Error

Tolerance

10.60

MHz

10.65

MHz

10.70

MHz

10.75

MHz

10.80

MHz

as

2)

3)

4)

COLOR

MARK

CERAMIC

FILTER

Fig.

3

FRONT

END

AND

FM

IF

MATCHING

ADJUSTMENT

(See

Fig.

6)

IF

COIL

(Front

end)

Fig.

4

Fig.

5

Adjust

V-Gain

Volume

to

obtain

a

2

cm

amplitude

of

0.3V

p-p

AM

FM

Radio

IF

Genescope

cali-

bration

voltage

on

screen,

and

set

Genescope

Output

to

90

dB.

Connect

Genescope

Output

to

3002

impedance

FM

Antenna

Terminal,

and

Genescope

Input

to

Terminal

(8)

(AF

Output)

of

FM

IF

P.C.

Board.

Set

Mode

Switch

to

“FM”

and

set

the

tuning

indicator

to

the

right

end

of

the

dial.

Adjust

the

upper

core

of

IF

Adjustment

Core

in

front

end

so

that

the

value

of

the

S

Curve

wave

height

is

maximum.

Then

adjust

the

lower

core

so

that

the

noise

element

is

maximum

and

the

upper

and

lower

reaches

of

the

scanning

line

are

the

same

level

(See

Figs.

4,

5

and

7).

3.

1)

2)

AS-8100

TERMINATION

PAD

bY

LA]

INPUT

OUTPUT

(MODEL

2151-8)

<<.

_

~

AM-FM

RADIO

IF

GENESCOPE

(MODEL

MSW-72IC)

Fig.

6

©

66

66

AM

AM

AM

tS

=

jae

LO

IF

-LR2

LRI

LA

(

TOP

VIEW

OF

FRONT

END

Fig.

7

AS-8100

-_

+O,

nomen

ye)

OUTPUT

30020

LCH

:

INPUT

O-—

—~

SPEAKER

~+——-O

FM

ANTENNA

OUTPUT

80

45W

TERMINATION

PAD

INEUT

(MODEL

MR-200)

FM

SIGNAL

GENERATOR

DISTORTION

METER

(MODEL

MSG-278G)

(MODEL

750C)

.

Fig.

8

FM

RECEPTION

FREQUENCY

RANGE

ADJUSTMENT

(See

Figs.

7

and

8).

Connect

the

FM

Signal

Generator

Output

to

the

3002

impedance

FM

Antenna

Terminal

of

Model

AS-8100

through

the

termination

pad.

Introduce

an

882

45W

dummy

load

resistor

to

the

left

channel

speaker

output

and

connect

a

distortion

meter

to

this

output.

At

this

time,

with

speaker

output

at

10

dB,

set

Speaker

Surround

Balance

Shift

to

Front/Left

position.

Set

the

FM

Signal

Generator

to

90

MHz

(400

Hz,

30%

internal

modulation

and

the

output

to

90

dB.

4)

5)

6)

Adjust

the

core

of

Oscillator

Coil

“Lo”

of

FM:

Local

Oscillator

in

front

end

so

that

the

distortion

meter

level

is

maximum

and

the

distortion

factor

is

minimum,

Set

the

tuning

indicator

to

the

right

end

of

the

dial.

Set

the

FM

Signal

Generator

frequency

to

106

MHz.

Adjust

Trimmer

Condenser

**TCO”

in

front

end

so

that

the

distortion

meter

level

is

maximum

and

the

distortion

factor

is

minimum.

Repeat

items

2)

through

5)

two

or.

three

times

until

perfect

reception

is

obtained

in

the

reception

frequency

range

of

87

to

109

MHz.

4.

OUTPUT

TERMINATION

PAD

{MODEL

MR-201I0)

TERMINAL

FM

SIGNAL

GENERATOR

(MODEL

MSG-2786)

DISTORTION

METER

|

OSCILLOSCOPE

-

(MODEL

760C)

Fig.

9

fs

FM

TUNER

TRACKING

ADJUSTMENT

(See

Figs.

7

and

8)

Use

the

same

instruments

as

in

item

3

(Fig.

8)

and

connect

them

in

the

same

way.

1)

2)

4)

5)

Set

the

FM

Signal

Generator

frequency

to

98

MHz

(400

Hz,

75%

internal

modulation)

and

the

output

to

16

dB.

Set

the

Tuning

Dial

to

receive

the

98

MHz

signal.

Adjust

core

“IF’’

of

coil

in

front

end

so

that

the

distortion

meter

level

is

maximum

and

the

dis-

tortion

factor

is

less

than

0.3%.

Set the

FM

Signal

Generator

frequency

to

106

MHz

and

set

the

tuning

dial

to

receive

the

106

MHz

signal.

Adjust

Trimmer

Condensers

“TCA”,

“TCR

1”

and

“TCR

2”

in

the

front

end

so

that

the

distortion

meter

level

is

maximum

and

the

distortion

factor

is

less

than

0.3%.

Set

the

FM

Signal

Generator

frequency

to

90

MHz

and

set

the

tuning

dial

to

receive

the

90

MHz

signal.

Adjust

cores

“LA”,

“LR

1”

and

“LR

2”

in

front

end

so

that

the

distortion

meter

level

is

maximum

and

the

distortion

factor

is

minimum.

Repeat

items

1)

through

4)

two

or

three

times

until

perfect

tracking

and

maximum

reception

sensitivity

is

obtained

at

90

MHz,

98

MHz,

and

106

MHz.

Note:

When

the

distortion

factor

is

0.3%,

the

generator

3.

1)

output

level

is

less

than

16

dB.

MUTING

SENSITIVITY

ADJUSTMENT

(See

Figs.

9

and

10)

Set

the

Signal

Generator

output

level

to

26

dB

(+3

dB)

and

connect

this

output

to

the

FM

Antenna

Terminal

of

Model

AS-8100

through

the

termi-

nation

pad,

and

connect

the

vertical

input

of

the

Oscilloscope

as

well

as

the

distortion

meter

input

-to

Terminal

(8)

(AF

Output)

of

AM

IF

PC.

Board.

3)

4)

2)

4)

Fig.

10

Turn

Muting

Level

Adjustment

Semi-Fixed

Re-

sistor

VR-1

(68

KB)

in

FM

IF

P.C.

Board

fully

clockwise

and

set

FM

Mute

Lever

to

“Off”

position.

Turn

semi-fixed

resistor

VR-1

counter-clockwise

to

position

at

which

Oscilloscope

sine

wave-

form

is

completely

erased

(do

not

turn

beyond

this

point).

If

in

this

waveform

erasing

process,

the

waveform

is

not

erased

and

appears

as

in

Fig.

10,

the

mute

circuit

is

defective.

.

If

perfect

adjustment

cannot

be

made

by

adjusting

muting

sensitivity

volume

VR-1,

because

this

is

due

to

poor

alignment

of

Coil

““L,”

(05M-755),

in

the

mute

circuit,

adjust

the

core

of

“L,”

for

improved

mute

circuit

sensitivity.

TUNING

INDICATOR

CHECK

AND

DISTORTION

ADJUSTMENT

Use

the

same

instruments

as

in

Section

5

(Muting

Sensitivity

Adjustment)

and

connect

them

in

the

same

way.

Set

the

FM

Signal

Generator

Output

to

66

dB,

and

connect

this

output

to

the

FM

Antenna

Terminal

of

Model

AS-8100

through

the

termination

pad.

Connect

the

Oscilloscope

Vertical

Input

as

well

as

the

Distortion

Meter

Input

to

Terminal

(8)

(AF

Output

Terminal)

of

FM

IF

P.C.

Board.

Set

the

FM

Signal

Generator

frequency

to

98

MHz,

and

set

the

tuning

dial

of

Model

AS-8100

to

the

same

98

MHz

frequency.

Adjust

the

upper

core

of

“Ly”

(O05M-775A)

so

that

the

tuning

indicator

needle

is

centered,

and

adjust

the

lower

core

of

“L,”

to

obtain

the

least

distortion.

FM

STEREO

FM

SIGNAL

MODULATOR

GENERATOR

(MSG-

2110)

(MSG

-278G)

OUTPUT

TERMINATION

PAD

AS-8100

SPEAKER

(MODEL

2151B)

7.

SEPARATION

ADJUSTMENT

1)

2)

3)

4)

5)

6)

(See

Fig.

11)

Set the

FM

Stereo

Modulator

Pilot

Signal

19

KHz

to

10%

modulation

and

the

main

signal

(L

+

R)

to

400

Hz,

90%

modulation.

Connect

this

composite

signal

(ratio

9:1)

to

the

EXT

MOD

Terminal

of

the

FM

Signal

Generator.

Set

the

FM

Signal

frequency

to

98

MHz

and

set

this

output

level

to

66

dB,

and

connect

to

the

FM

Antenna

Terminal

of

Model

AS-8100.

Connect

a

high

sensitivity

V.T.V.M.

or

an

8Q

more

than

45W

dummy

load

resistor

to

the

various

speaker

output

terminals.

Set

Tone

Control

to

“Flat”

position

and

then

set

the

tuning

dial

to

98

MHz

and

speaker

output

to

20

dB.

Turn

Separation

Adjustment

Volume

VR-3

(1

KB)

fully

clockwise.

Set

the

FM

Stereo

Modulator

to

right

channel,

and

adjust

the

cores

of

“L,”

and

“L,”

coils

so

that

the

indication

of

V.T.V.M.

(connected

to

left

channel)

is

minimum.

Then

turn

VR-3

counter-clockwise

to

position

at

which

the

V.T.V.M.

indication

is

minimum.

Set

FM

Stereo

Modulator

to

left

channel

and

adjust

the

cores

of

“L,”

and

“L,”

so

that

the

indication

of

V.T.V.M.

(connected

to

right

chan-

nel)

is

minimum.

Then

adjust

VR-3

so

that

the

V.T.V.M.

indication

is

minimum.

If

separation

is

not

better

than

35

dB,

repeat

the

above

adjustments

again.

Avoid

turning

the

coil

cores

too

much

when

making

this

second

adjust-

ment.

If

the

FM

Signal

Generator

output

has

been

decreased

to

26

dB

(+3

dB),

check

to

see

whether

the

stereo

indicator

lamp

has

been

extinquished.

8.

1)

2)

3)

4)

OUTPUT

(MODEL

164)

V.LV.M.

Fig.

11

"AM-FM

RADIO

IF

GENESCOPE

(MODEL

MSW-72IC)

Fig.

12

AM

IF

CIRCUIT

ADJUSTMENT

(See

Figs.

12

and

13)

Adjust

the

V-Gain

Volume

to

obtain

a

2

cm

amplitude

of

0.3V

p-p

AM

FM

Radio

IF

Gene-

scope

calibration

voltage

on

screen,

and

set

the

Genescope

output

to

60

dB.

2cm

pr

een

Fig.

13

Connect

Genescope

output

to

Test

Point

(TP)

and

Genescope

Input

to

Point

(8)

(AF

Output).

Set

Mode

Switch

to

“AM”

and

reception

fre-

quency

to

about

1630

kHz.

Adjust

cores

of

IFT,

T,;,

T,,

and

T,;

of

AM

IF

Amp

P.C.

Board

so

that

the

waveform

(Fig.

13)

level

is

maximum

and

center

frequency

is

455

kHz

(Center

frequency

differs

according

to

country.

Adjust

according

to

country’s

center

frequency).

9.

1)

2)

3)

4)

5)

6)

OUTPUT

TERMINATION

PAD

(MR-2010)

AS-8100

EXT

AM

ANTENNA

INPUT

L-CH

an

45w

SPEAKER

OUTPUT

AM

SIGNAL

GENERATOR

(MSG-230E)

AS-8100

TERMINATION

PAD

(MR-2010)

DISTORTION

METER

(MODEL

760C)

Fig.

14

AM

SIGNAL

GENERATOR

(MSG

-230E)

AM

RECEPTION

FREQUENCY

RANGE

ADJUSTMENT

(See

Fig.

14.)

Connect

the

AM

Signal

Generator

output

to

the

EXT

AM

Antenna

input

terminal

of

Model

AS-

8100

through

the

termination

pad.

Introduce

an

8Q

more

than

45W

dummy

load

resistor

to

the

left

channel

speaker

output

and

connect

a

dis-

tortion

meter

to

this

output.

At

this

time,

set

speaker

output

level

to

10

dB

and

the

Surround

Balance

Shift

to

Front/Left

position.

Set

the

tuning

indicator

to

the

left

end

of

the

dial.

Set

the

AM

Signal

Generator

frequency

to

525

kHz

(+5

kHz),

(400

Hz,

30%

modulation)

and

the

output

to

70

to

80

dB.

Adjust

the

core

of

AM

Local

Oscillator

Coil

“L”

(094-465)

in

the

AM

IF

P.C.

Board

so

that

the

distortion

meter

level

is

maximum

and

the

dis-

tortion

factor

is

minimum.

Set

the

tuning

indicator

to

the

right

end

of

the

dial.

Set

the

AM

Signal

Generator

frequency

to

1530

kHz

(£5

kHz).

Adjust

Trimmer

Condenser

“TC3”

in

front

end

block

so

that

the

distortion

meter

level

is.

maxi-

mum

and

the

distortion

factor

is

minimum.

Repeat

adjustments

outlined

in

items

2)

through

5)

above

two

or

three

times

until

perfect

reception

is

obtained

in

the

reception

frequency

range

of

525

to

1530

kHz.

2)

3)

4)

5)

6)

7)

8)

DISTORTION

METER

(MODEL

760C)

Fig.

15

AM

TUNER

TRACKING

ADJUSTMENT

(See

Fig.

15)

Connect

the

Signal

Generator

output

to

the

AM

input point

of

Mode!

AS-8100

through

the

termi-

nation

pad.

Introduce

an

882

more

than

45W

dummy

load

resistor

to

the

left

channel

speaker

output

and

connect

this

output

to

the

distortion

meter

input.

At

this

time,

with

speaker

output

level

at

10

dB,

set

Speaker

Surround

Balance

Shift

to

Front/Left

and

Tone

Control]

to

“Flat”

position.

Set

the

AM

Signal

Generator

frequency

to

1400

kHz

(400

Hz,

30%

internal

modulation)

and

the

output

to

21

dB.

Set

the

tuning

dial

to

receive

the

1400

kHz

signal.

Adjust

Trimmer

Condensers

“TC

1”

and

“TC

2”

in

the

front

end

so

that

the

distortion

meter

level

is

maximum

and

the

distortion

factor

is

minimum.

Set the

AM

Signal

Generator

frequency

to

600

kHz

and

set

the

tuning

dial

to

receive

the

600

kHz

signal.

Adjust

the

core

of

coil

“L,”

(05M-741

A)

in

AM

IF

P.C.

Board

as

well

as

core

of

the

Bar

Antenna

so

that

the

distortion

meter

level

is

maximum

and

the

distortion

factor

is

less

than

10%.

Set the

AM

Signal

Generator

frequency

to

1,000

kHz

and

set

the

tuning

dial

to

receive

the

1,000

kHz

signal.

Check

to

confirm

that

the

distortion

meter

level

is

maximum

and

the

distortion

factor

is

less

than

10%.

Repeat

items

2)

through

6)

above

two

or

three

times

until

perfect

tracking

is

obtained

at

these

three

frequencies.

Note:

When

the

distortion

factor

is

10%,

the

Generator

output

level

is

less

than

21

dB.