Akai 1722W Manual de usuario

STEREO

TAPE

RECORDER

mopeEL

1722W

ALSO

APPLICABLE

MODEL

1722L

STEREO

TAPE

RECORDER

SECTION

SERVICE

MANUAL

.......

sig

eteaternateis

tentiefes,

SECTION

PARTS

LIST

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

0..-0.2---

SECTION

SCHEMATIC

DIAGRAM....................

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

SPECIFICATIONS:

2s.

caiccenigie

bebe

bes

det

ehh

Mobi

tases

Gees

tee

Il.

MEASURING

METHOD

.............-.0-

2202

eee

ete

teens

TAPE

SPEED

DEVIATION

...........

2...

eee

ete

WOW

AND

FLUTTER

......

2...

eee

teen

eee

FREQUENCY

RESPONSE

.......-.

eee

SIGNAL

NOISE:

RATIO

122.

hie

Sioltal

tdacee

eran

eheee

sk:

cng

eee

Bas

TOTAL

HARMONIC

DISTORTION

FACTOR

.......-....

0200

eee

CROSS

TALK

(Cross

talk

between

the

tracks)

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

eee

ERASE

RATIO

1...

ene

eee

POWER

OUTPUT...

eee

een

ees

Hl.

DISMANTLING

UNIT

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

02020

cee

eet

eae

IV.

MECHANISM

ADJUSTMENT

------

2-20-2000

eset

cere

treet

entrees

testes

PINCH

WHEEL

ADJUSTMENT

asa

ier

Pan

eee

Spb

ate

Vain

he)

Griese

eAD

eel

R-Rh

One)

aleco Seine

SUPPLY

REEL

TABLE

TENSION

ADJUSTMENT

........-..---.5e

eee

eres

TAKE

REEL

TABLE

TENSION

ADJUSTMENT

...........-------+

eee

eeee

FWD/REC

MODE

MECHANISM

CHANGE

AND

ADJUSTMENT

..........-.----

DRIVE

BELT

POSITION

ADJUSTMENT

.........---.

eee

eens

FLYWHEEL

LOOSE

PLAY

ADJUSTMENT

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

eee

renee

eee

ADJUSTMENT

IDLER

POSITION

FAST

FORWARD

MODE

bBo

Ral

aap

Batata

AUTOMATIC

SHUT-OFF

OPERATING

POINT

ADJUSTMENT

............-..-.

HEAD

HEIGHT

ADJUSTMENT

........-.....06.

0000

eee

tenes

HEAD

HEIGHT

ADJUSTMENT

...........0-

eee

HEAD

SLANT

ADJUSTMENT

.........-.-

2-22

cece

eee

RECORDING/PLAYBACK

HEAD

AZIMUTH

ALIGNMENT

ADJUSTMENT

.......

Vi.

-AMPLIFIER.

(se

ieee

dag

PIS

tee

gigas

See

eet

RECORDING

BIAS

FREQUENCY

CHECK

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

eee

FREQUENCY

RESPONSE

CHECK

......-..

00-2

cece

eet

tent

eee

RECORDING

BIAS

VOLTAGE

CHECK

«1...

eee

4."BRASE°

VOETAGE:.

«0

cock

coed

pie

Wie

ese

aE dg

SOS

HUM

ALLEVIATION

COIL

ADJUSTMENT

.........-....

0-2

eee

VIL

D.C.

RESISTANCE

VARIOUS

COILS

.............0-02

5-062

eee

VIII.

COMPOSITE

VIEWS

COMPONENTS.

.............---2-0

cece

ree

eens

nett

“9

SPECIFICATIONS

asterisk

figure

indicates

the

minimum

guaranteed

performance.

TRACK

SYSTEM

4-track

2-channel

stereo/monaural

system.

—--

REEL

CAPACITY

TAPE

SPEED

WOW

AND

FLUTTER

7”

reel

7-1/2

and

3-3/4

ips.

+2%

(*4+3%)

Less

than

0.14%

(*0.15%)

R.M.S.

7-1/2

ips.

Less

than

0.18%

(*0.20%)

R.M.S.

3-3/4

ips.

TOTAL

WOW

AND

FLUTTER

Less

than

0.22%

R.M.S.

7-1/2

ips.

(Scotch

#175

TAPE

3,000

recording

and

playback)

FREQUENCY

RESPONSE

WIDE

RANGE

TAPE

LOW

NOISE

TAPE

1,000

-16VU

Recording,

measured

speaker

output

21,000

(*50

20,000

Hz)+3

7-1/2

ips.

15,000

(*50

12,000

Hz)+3

3-3/4

ips.

18,000

(*50

18,000

Hz)43

7-1/2

ips.

13,000

(*50

10,000

Hz)+3

3-3/4

ips.

DISTORTION

FACTOR

Less

than

7-1/2

ips.

TOTAL

DISTORTION

FACTOR

Less

than

1,000

“0’’VU

recording

mic

Input,

Output

and

Tone

Control

Max

using

Scotch

#211

SIGNAL

NOISE

RATIO

Better

than

(*47

dB)

dBm

output

and

Tone

Control

Max

(from

Speaker

Out)

TOTAL

SIGNAL

NOISE

RATIO

Better

than

dBm

output

and

Tone

Control

Max.

(from

Speaker

Out)

CROSS

TALK

Better

than

(*55

dB)

Monaural

(Mic

input

mV,

1,000

recording,

measured

line

output)

Better

than

(*43

dB)

Stereo

(mic

input

mV,

1,000

recording,

measured

line

output)

ERASE

RATIO

Better

than

(*65

dB)

1,000

recording

INPUTS

MIC

INPUT

LINE

INPUT

DIN

INPUT

OUTPUTS

LINE

OUTPUT

DIN

OUTPUT

PHONE

OUTPUT

SPEAKER

OUTPUT

RECORDING

BIAS

FREQUENCY

Volume

maximum,

1,000

“0”

indication

than

0.5

than

(High)

than

(Low)

(volume

min)

2.3V

(volume

max)

using

250

eel

“0”

pre-recorded

tape

7-1/2

ips.

100

each

CH.

3W/82

each

CH.

*More

than

(2W/2W)

continuous

power

kHz+8%

BIAS

LEAK

Less

than

-20

measured

line

output

HIGH

FREQUENCY

DEVIATION

RECORDING

CAPACITY

FAST

FOWARD

AND

REWIND

TIME

MOTOR

With

using

8,000

3-3/4

ips.

pre-recorded

tape

7-1/2

ips.

Tone

Control

Max

hours

stereo

recording

using

1,200

ft.

tape

3-3/4

ips

80/100

sec.

using

1,200ft.

tape

60/50

2-4

pole

induction

2-speed

motor.

type:

IC-16Y

Revolutions:

1,790/1,490

r.p.m.

60/50

(Low

Speed)

3,580/2,980

r.p.m.

60/50

(High

Speed)

HEADS

RECORDING/PLAYBACK

HEAD

ERASE

HEAD

Type:

P4-150

Gap:

microns

Impedance:

1,25022415%

1,000

D.C.

Resistance:

912

Type:

E4-200

Gap:

0.6

Impedance:

2002+5%

100

kHz

D.C.

Resistance:

eee

TRANSISTORS

2SC458LG(B)

(C)...

2SCLOTSTSD)

2SC711

(D)

(E)...

28C1312

(F)

(G)...2

2SC968

(3)

(Red)...

DIODES

IN34A

...

10DC-1

(Blk)

...1

10DC-1

(Red)...

SPEAKERS

built

(S”

7’)

Oval

speakers

Impedance:

POWER

SUPPLY

100

240V

A.C.

50/60

120V

A.C.

for

CSA/UL

Models

220V

A.C.

for

CEE

Models

POWER

CONSUMPTION

SOW

DIMENSIONS

1722W

358(W)

360(H)

248

(D)mm_=

(14”

14.1”

9.8")

1722L

359(W)

366(H)

248

(D)mm__—((14.1""

14.4"

9.8")

WEIGHT

1722W

13.2

(29

tbs.)

1722L

14.0

(30.8

Ibs.)

NOTE:

Specifications

subject

change

without

notice.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

FREQUENCY

RESPONSE

Line

Audio

1722w

(Output

Input

Frequency

Counter

Oscillator

Fig.

shown

Figure

connect

Frequency

Counter

the

Line

Output

the

recorder.

Take

frequency

counter

reading

the

beginning,

middle,

and end

tape

winding

during

playback.

The

maximum

value

these

respective

readings

will

represent

tape

speed

deviation.

Fig.

High

Sensitivity

V.T.VM.

Connect

the

various

instruments

shown

2.WOW

AND

FLUTTER

Fig.

and

supply

1,000

sine

wave

signal

the

Line

Input

the

recorder

from

Audio

Wow

and

Frequency

Oscillator

through

Attenuator.

Set

Flutter

Meter

recorder

“REC”

mode

and

turn

recording

level

control

volume

obtain

“O”

meter

Fig.

reading.

Under

conditions

described

above,

readjust

Method

Attenuator

that

the

Line

Input

-16

dB,

and

shown

Fig.

connect

the

Line

Output

the

record

18,000

spot

frequencies.

recorder

the

Input

Wow

and

Flutter

Meter.

Rewind

tape

and

playback

from

the

beginning.

Use

3,000

pre-recorded

test

tape

and

take

Take

V.T.V.M.

spot

frequency

readings

and

plot

wow

and

flutter

meter

reading

the

beginning,

values

graph.

fogs

middle,

and

end

tape

winding.

The

maximum

ope,

value

these

respective

readings

will

represent

the

NOTE:

When

measuring

frequency

response,

new

wow

and

flutter.

tape

should

used.

Method

Supply

3,000

sine

wave

signal

from

Audio

SIGNAL

NOISE

RATIO

Frequency

Oscillator

and

make

recording

Speaker

blank

tape

the

beginning,

middle,

and

end

tape

Output

Input

rae

‘ >

npu

winding.

Rewind

and

playback

tape.

Measure

wow

1722W

eed

and

flutter

with

Wow

and

Flutter

Meter.

(The

aches

Fig.

wow

and

flutter

value

Method

will

times

Method

Connect

the

various

instruments

shown

Fig.

and

playback

250

“0”

pre-recorded

test

tape

and

adjust

volume

control

obtain

+10

dbm

V.T.V.M.

reading.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

each

the

measured

values

into

decibels.

TOTAL

HARMONIC

Distortion

Meter

Fig.

Connect

the

various

instruments

shown

Fig.

Load

Scotch

#211

tape

and

set

Tone

control

“MAX”

position.

Record

1,000

sine

wave

signal

“O”

VU.

Playback

the

resultant

signal

and

measure

the

overall

distortion

factor.

NOTE:

this

time,

Distortion

factor

the

Audio

Frequency

Oscillator

must

suf-

ficiently

small.

When

measuring

the

distortion

factor,

new

tape

should

used.

CROSS

TALK

(Cross

talk

between

the

tracks)

—

TAPE

DIRECTION

Fig.

shown

Fig.

first

record

1,000

sine

wave

signal

Track

No.3

level.

Next,

record

under

non-input

condition.

Then,

playback

the

tape

Tracks

No.3

and

through

the

B.P.F.

(band

pass

filter

sensitivity

...

and

obtain

ratio

between

the

two

from

the

following

formula:

log

(dB)

2—7—"1

where,

desired

cross

talk

ratio

(dB)

1,000

signal

output

level

(V)

1,000

cross

talk

level

(V)

Non-input

signal

recorded

level

(V)

ERASE

RATIO

shown

Fig:

4"8@Minect

High

Sensitivity

V.T.VM.

the

Line

Output

the

recorder.

Playback

virgin

tape

and

take

V.T.V.M.

reading

the

output

level.

Next,

record

1,000

sine

wave

signal

dB,

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

condition

and

take

reading

the

noise

level

output

the

erased

signal

and

obtain

ratio

between

the

two

from

the

following

formula:

=20

log

(dB)

2—

where,

Desired

erase

ratio

(dB)

1,000

signal

output

level

(V)

Non-input

signal

recorded

level

(V)

Virgin

tape

noise

output

level

(V)

POWER

OUTPUT

Speaker

High

Sensitivity

V.T.VM.

Fig.

7a”

shown

Fig.

connect

dummy

load

resistor

the

speaker

output

the

recorder

and

connect

this

terminal

High

Sensitivity

V.T.V.M.

Playback

250

“0”

pre-recorded

test

tape

and

take

V.T.V.M.

reading

the

output

level.

The

resultant

output

can

obtained

from

the

results

the

above

measurement

using

the

following

formula:

P=-—

(W)

where,

Desired

power

output

(watts)

Measured

voltage

(V)

(R.MS.)

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

disassembly,

please

disassemble

the

order

reverse

order.

nal

guguguqugu

glug

gugugugugugTugTuqTug7g

PAUSE

KNOB

sECHANISM:

KNOBS

shows

photographs.

Reassemble

—_—

SCREWS

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