Akai GX-225D Manual de usuario

PART

SUSTEY

MODEL

GX-225D

MODEL

GX-221

STEREO

TAPE

DECK

MODEL

GX-225D

ALSO

APPLICABLE

MODEL

GX-221

STEREO

TAPE

RECORDER

AND

GX-221D

STEREO

TAPE

DECK

SECTION

SERVICEMANUAL

........-.6-¢2

eee

SECTION

PARTSLIST

...........

aesesets.

ase

SECTION

SCHEMATIC

DIAGRAM

........-.--.+.---60

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

SPECIFICATIONS

2.000

ccc

center

eee

eens

MEASURING

METHOD

......0000

cece

cee

cere

creer

ene

aeeee

TAPE

SPEED

DEVIATION

1.0...

ccc

eee

eens

WOW

AND

FLUTTER

ccc

pba

ecw

dane

FREQUENCY

RESPONSE

....-

0.0

ete

eee

erence

etes

RICNAL

NOISE

RATIO

\-soidw

doo

poh

TOTAL

HARMONIC

DISTORTION

FACTOR

....-0..00

0000

eee

eer

tee

CROSS

TALK

(Cross

talk

between

the

channels)

06-66

eee

ERASE

RATIO“

cect

6's

289

Oi we

POWER

OUTPUT

.....

seg

this

duds

wee

bie

RUE

OHS

VCE

ERAGE

DISMANTLING

UNIT

.......000

cece

eee

ete

eet

eeees

‘eee

TRANSPORT MECHANISM

...-.-0-

00000

eect

eee

ete

eee

eens

FORWARD

PLAYBACK

RECORDING

MODE

......

FAST

FORWARD/REWIND

MODE

......-

20sec

eee

ere

teeters

BLOCK

DIAGRAM

VOLTAGE

SUPPLY

CIRCUIT

MOTOR

EACH

MODE

....

SYSTEM

CONTROL

CIRCUIT

OPERATION

,..

0.2000

eee

MECHANISM

ADJUSTMENTS

........-0

0-0-0

eee

cereeee

Sid

Sore

eee

REEL

TABLE

HEIGHT

ADJUSTMENT

0.0...

eee

ets

PINCH

WHEEL

PRESSURE

MEASURING

METHOD

Aiki

ated

rks

eine

bee

BRAKE

TENSION

ADJUSTMENT

2.0.0

eee

eter

eres

SUPPLY

VOLTAGE

AND

TENSION

VARIOUS

OPERATING

MODES

......----

HEAD

ADJUSTMENTS

.......

sos

ttn

athchv

fet

desc

Goad:

Saal

taass

teh

HEAD

HEIGHT

ADJUSTMENT

.......

0.0002

eee

reese

BAG

Parity

arg

ites

anette

HEAD

AZIMUTH

ALIGNMENT

ADJUSTMENT

....

26-02

seer

ees

AMPLIFIER

ADJUSTMENTS

1.0.0.0

cece

teeter

eee

18°

PLAYBACK

OUTPUT

LEVEL

ADJUSTMENT

......000

eee

rece

ree

METER

SENSITIVITY

ADJUSTMENT

.....

dnokudiend

upesoe

ata

peated

HIGH

RANGE

VARIATION

CHECK

2.0.0.0

cee

eee

eet

nneee

RECORDING

LEVEL

ADJUSTMENT

..........

Bacio

Gaerne

ein

Aiae

Bitte

Bushs

RECORDING

BIAS

FREQUENCY

MEASURING

METHOD

.........--

2022s

RECORDING

BIAS

VOLTAGE

ADJUSTMENT

(Frequency

Response

Adjustment)

.-....-

AUTOMATIC

NOISE

REDUCTION

AMPLIFIER

ADJUSTMENTS

(GX-225D)

......-+++22

RAMP:

ADTUSTMENT

6a.

as-eGice

hae

Sed

SES

are

‘>.

A.N.R.

OPERATION

AND

CHARACTERISTICS

...-...---00-035

Bie

phan

Readers

COMPOSITE

VIEWS

COMPONENTS

.....

2-22-02

ete

rece

rts

tte

SPECIFICATIONS

asterisk

figure

indicates

the

minimum

guaranteed

performance.

TRACK

SYSTEM

REEL

CAPACITY

TAPE

SPEED

WOW

AND

FLUTTER

FREQUENCY

RESPONSE

AKAIS.R.T.

Tape

Regular

Tape

SIGNAL

NOISE

RATIO

HUM

AND

NOISE

DISTORTION

FACTOR

TONE

CONTROLS

Treble

Bass

CROSS

TALK

ERASE

RATIO

BIAS

FREQUENCY

BIAS

LEAK

HIGH

FREQUENCY

DEVIATION

Between

Channels

Between

FWD/REV

REC./P.B.

LEVEL

INPUTS

Mic

Input

Line

Input

Din

Input.

OUTPUTS

Line

Output

Din

Output

Speaker

Output

HEAD

PHONE

OUTPUT

REVERSING

TIME

FAST

FORWARD

AND

REWIND

TIME

MOTORS

Main

Motor

Reel

Motor

Erase

Head

track

channel

stereo/monaural

system

7”

reel

7-1/2

ips(19

cm/sec.)

+0.7%(*+0.8%)

3-3/4

ips(9.5

cm/sec.)

£0.7%(*£0.8%)

1-7/8

ips(4.75

cm/sec.)

+0.7%(*4£0.8%)

Less

than

0.089%{*0.12%)

R.M.S,

7-1/2

ips

Less

than

0.12%

*0,25%)

R.M.S.

3-3/4

ips

Less

than

0,20%(*0.4%)

R.M.S,

1-7/8

ips

25,000

7-1/2

ips

20,000

3-3/4

ips

10,000

£3

1-7/8

ips

23,060

Hz(*36

22,000

Hz}

7-1/2

ips

19,000

Hz(*38

18,000

Hz)

3-3/4

ips

9,000

Hz(*40

9,000

Hz)

1-7/8

ips

Better

than

dB(S3

with

N.R.

process)

Better

than

7-1/2

ips

Better

than

3-3/4

ips

Better

than

1-7/8

ips

Better

than

Reverse

Mode

Tone

Control

and

Main

Volume:

Min.

(Model

GX-221

only)

Less

than

1.5%{*3%)

1,000

“0”

Recording

12 +2

dB(Max.)

and

—14

dB(Min.)

kHz

dB(Max.)

and

-10

dB{Min.}

100

(Model

GX-221

only)

Better

than

dB(*58

4B)

monaural

Better

than

dB(*43

dB)

stereo

Better

than

100

kHz

Less

than

—20

Within

dB,

using

8,006

3-3/4

ips

recorded

tape

7-1/2

ips

Within

dB,

using

8,000

3-3/4

ips

recorded

tape

7-1/2

ips

441.5

0.2

m¥{*0.4

mV)

Impedance:

mV(*60

m¥)

Impedance:

150

mV(low)

and

mV{*60

mV}

(high)

1,228V

(4+

1dB)}

Impedance:

20kQ

0.4V

total

music

power

(GX-221

only)

continuous

power

{GX-221

only)

sec.

85/65

sec.,

using

1,200

ft.

tape

50/60 Hz

speed

hysteresis

synchronous

motor

Type:

HC-16X

Revolutions:

3,000/1,500/750

r.p.m.(50

Hz)

3,600/1,800/900

r.p.m.(60

Hz)

Two

6-pole

eddy

current

outer

rotor

motors

Type:

24X0-MR

Revolutions:

930

r.p.m.

(50

Hz)

1,120

r.p.m.

(60

Hz)

Type:

E4-250

Gap:

0.6

Impedance;

1952

10%

100

kHz.

D.C.

Resistance:

3.52

ions

Recording

Head

Playback

Head

TRANSISTORS

Type:

R4-200

Gap:

15%

Impedance:

1,8702

100

kHz

D.C.

Resistance:

Type:

P4-200

Gap:

1,75y

15%

Impedance:

kHz

D.C.

Resistance:

5002

LD3141.,.2

28C372(Y}

...1

28C871(F)..,12

28C945(Q)(R)...6

28C968(3}(4)

-..3

28C458LG(C)...6

STKOLS

...

2(GX-221

only)

28C971(2)(3)

RED...

28C1211(C}(D)

2SD223(G)(Y)..-

2SCTLICE)...4

DIODES

(N.R.

Amp.)

(N.R.

Amp.)

IN34A...7

5B2...1(GX-221

only)

10D1...3

WZ-240.,.1

lop4...1

WG-599

...

4(N.R.

Amp.}

POWER

SUPPLY

100

240

A.C.

50/60 Hz

POWER

CONSUMPTION

INSULATION

RESISTANCE

90W

Models

GX-225D,

GX-221D

135W

Model

GX-221

Mare

than

INSULATION

DURABILITY

DIMENSIONS

WEIGHT

500V

D.C.

for

than

min.

duration,

430(W)

425(H)

230(D)

(17.2"

17”

9.2")

20.5

kg(45.1

Ibs.)

Models

GX-225D,

GX-221D

22.5

kg(49.5

Ibs.)

Model

GX-221

NOTE:

Specifications

subject

change

without

notice.

ll.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

Frequency

counter

input

GX-225D

Line

output

Fig.

shown

Fig.

connect

Frequency

Counter

the

Line

output.

Playback

1,000

pre-recorded

test

tape.

Take

frequency

counter

reading

the

beginning,

middle,

and

end

tape

winding

during

playback.

The

maximum

value

these

respective

readings

will

represent

tape

speed

deviation.

WOW

AND

FLUTTER

GX-225D

Wow

and

Flutter

Line

output

Meter

input

Fig.

Method

shown

Fig.

connect

the

Line

output

the

Input

Wow

and

Flutter

Meter.

Playback

3,000

pre-recorded

test

tape

and

take

wow

and

flutter

meter

reading

the

beginning,

middle,

and

end

tape

winding.

The

maximum

yalue

these

respective

readings

will

represent

the

wow

and

flutter.

Method

Supply

3,000

sine

wave

signal

from

Audio

Frequency

Oscillator

and

make

recording

blank

tape

the

beginning,

middle,

and end

tape

winding.

Rewind

and

playback

the

resultant

signal.

Measure

wow

and

flutter

with

Wow

and

Flutter

Meter.

(The

wow

and

flutter

value

Method

will

twice

that

Method

A.)

FREQUENCY

RESPONSE

GX-225D

Line

Frequency

input

ane

Oscillator

output

High

Sensitivity

V.T.V.M,

Fig,

For

measuring

frequency

response,

connect

instru-

ments

shown

Fig.

and

proceed

follows:

Supply

1,000

sine

wave

the

Line

input

from

Audio

Frequency

Oscillator

through’

Attenuator.

Set

recorder

recording

mode

and

turn

recording

level

contro!

volume

and

line

output

level

control

volume

maximum,

Adjust

attenuator

obtain

a+4

V.T.V.M.

reading.

Under

conditions

described

above,

re-adjust

attenuator

that

the

Line

Output

—16

dB,

and

record

22,000Hz

7-1/2

ips

spot

fre-

quencies.

Rewind

the

tape

and

playback

from

the

beginning.

Take

V.T.V.M.

spot

frequency

readings

and

plot

values

graph.

NOTE:

When

measuring

frequency

response,

new

tape

should

used.

SIGNAL

NOISE

RATIO

GX-225D

High

Sensitivity

Line

output

VIVM,

Fig.

shown

Fig.4,

connect

High

Sensitivity

V.T.VM.

the

Line

output.

Playback

250

“Q”

pre-recorded

test

tape

and

mieasure

the

output.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition,

Convert

each

the

measured

values

into

decibels.

§,

TOTAL

HARMONIC

DISTORTION

GX-225D

Line

input

—Line

output

Audio

Frequency

Oscillator

Distortion

Meter

Fig.

Connect

the

measuring

instruments

shown

Fig.

and

record

1,000

sine

wave

signal

“0”

VU.

Playback

the

resultant

signal

and

measure

the

overall

distortion

factor.

Measure

the

noise

level

the

tape

recorder

without

the

tape.

Connect

the

audio

fre-

quency

oscillator

directly

the

distortion

meter

for

measurement

the

distortion

factor

the

oscil-

lator.

The

required

distortion

factor

can

obtained

from

the

results

the

above

measurement

the

following

formula:

=d—di

—d2

where,

Required

distortion

factor

Overall

distortion

factor

Noise

level

Distortion

factor

the

oscillator

NOTE:

When

measuring

the

distortion

factor,

new

’

tape

should

used.

CROSS

TALK

(Cross

talk

between

the

channels}

(TAPE)

REV

ees

TAPE

DIRECTION

Fig.

shown

Fig.

first

record

1,000

sine

wave

signal

Track

No.

level.

Next,

record

under

non-input

condition.

Then,

playback

the

tape

Tracks

No.

and

(reversed

condition

tape)

through

the

B.P.F,

(band

pass

filter

sensitivity

...

1:1)

and

obtain

ratio.

between

the

two

from

the

following

formula:

E2—-E1

where,

Desired

cross

talk

ratio

(dB)

1,000

signal

output

level

’

1,000

cross

talk

level

=Non-input

signal

recorded

level

Bax

log

(dB)

ERASE

RATIO

shown

Fig.4,

connect

High

Sensitivity

V.T.V.M.

the

Line

ouput.

Playback

virgin

tape

and

take

V.T.V.M.

reading

the

output

level.

Next,

record

1,000

sine

wave

signal

VU,

‘then

playback

this

recorded

signal

and

take

V.T.V.M.,

reading

the

output

level.

Next,

using

this

pre-recorded

tape,

record

under

non-input

condi-

tion

and

take

reading

the

noise

level

output

the

erased

signal

and

obtain

ratio

between

the

two

from

the

following

formula:

log

(dB)

E2-E1

where,

Desired

erase

ratio

(dB)

1,000

signal

output

level

Non-input

signal

recorded

level

Virgin

tape

noise

output

level

POWER

OUTPUT

(GX-221

only)

High

Sensitivity

output

V.T.VM.

Fig.

shown

Fig.

connect

dummy

load

resistor

the

speaker

output

and

connect

this

terminal

High

Sensitivity

V.T.V.M.

Playback

250Hz

“0”

pre-recorded

test

tape

and

take

V.T.V.M.

reading

the

output

level.

The

resultant

output

can

obtained

from

the

above

measurement

using

the

following

formula:

-2

Ww)

where,

Desired

power

output

(watts)

Measured

voltage

(R.M.S.)

8&Q

Il.

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

disassembly,

please

disassemble

the

order

shown

photographs.

Reas-

semble

reverse

order.

SIDE

PLATE

REAR

PLATE

MECH.

BLOCK

MECHANISM

ADJUSTMENT

LOWER

FRAME

cena

P.B.

AMP.

P.C.

BOARD

REC.

AMP.

P.C.

BOARD

CARD

HOLDER

SCREWS

IV.

TRANSPORT

MECHANISM

Fig.

F.FWD/RWD

MODE

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