Hitachi tra-722 service manual

MODEL

A

single

TRA-722

knob

for

both

recording

and

playback!
Large
Built

speaker

into

a

and

handy

high

case

,t'•.·.· .:•·

~

.

\· - '

~-···

output

for

••u

..

.......

easy

.

offer

excellent

carrying!

Hi-Fi

reproduction!

28

ACCESSORIES

Highly

sensitive
Earphone
Extension
HITACHI

SPECIFICATIONS

Tube

Components

Tape

Speed

Recording

Track
Recording
Er

asi

ng
Maximum
Speaker
Output

Power

Frequency

Power

Source

Dimensions

Weight

for

monitoring

cord

for

5.inch

recording

Time

Syste

m

System

Size

of

Characteristics

dynamic

Tape

recording

recording

Reel

microphone

tape.

and

from

radio

12AX7,

6BM8

7½

ins./sec. (19cm/sec

3¾

ins./sec. (9.5 cm/

120

minutes

60

minutes

Double

A.G .

bias

A.G.

electromagnetic

7

inches

7 x

4inch
3watts
50-12,000cycles
50

- 7,

000cycles
60watts
A.G. 50/

60
Width 13%'' (
20

lbs

. (9 kg)

.

replay.

or

replaying

and

on

two

on

two

track

system

oval

type P.M.

max

.

100

.

llO

cycles

35cm)xHeight 6%" (17cm)xDepth

over

radio

l S

315

x 2 (Diod

.)

sec

.)

tracks at

tracks

(7 ½

(3¾

ins./sec

.

117. 210. 230. volts

at

system

Speaker

ins./sec.

7 ½ ins./

3¾ ins./

)

.)

e)

speaker.

lN

34A

sec.

sec.

x 4 (

Diode

11'' (

)

28cm

)

FEATURES

■

There

playback, quick wind, rewind, stopping and instant

stopping.

■

Noiseless Hi-Fi sound is guaranteed by the large
7 x 4 inch speaker and the
which completely removes power source hum.

■

Light-gray and light-brown combination gives
attractive appearance to the case, which is made
a suitcase style for convenient carrying.

■

Tape speed can

3¾ ins,/

■

The large, easy-to-r
recording .

■

The tone control gives the right tonal quality to
suit the listener 's taste.

■

Recording can

which comes among the accessories.

is

only one knob to turn - for recording,

sec

. by simply

"silicon

be

changed to 7 ½ ins./

turning

ead

level meter facilitates proper

be

monitored by a crystal earphone,

rectifying system "

a knob.

sec.

an

in

or

1/

One

hand

REWIND

control

knob

29

CONTROLS

To

operate

plug

into
insert
volume
the tape and

RECORDING

When

■

on

■

■

indicated
" FORWARD ",

■

the
and

■

knob
and

When
an

■

on

■

the
speaker
noise

■

the
the

■

be
the
plug.

REWINDING

When

rewinds

the

the

other

control

recording

Insert

the

the

left

Turn

the

Using

right

by

U

sing

the

level

indicator

black

areas

When

the

is

turned

recording

recording

extension

Insert

the

the

left

When

recording

radio's

voice

occurs,

When

recording
extension
black

output

Before

recording

sure

that

radio

chassis. If

the
rapidly

side

tape

side

recording

function

this

tape

recorder, insert

power

socket

of

cord

procedure

the

recorder.

selector

and

located

to

turn

plug

the
turn
STOP ".

end

clockwise

follow

the

using

microphone

of

the

speed

thumb, press

the

arrow

to "INSTANT

microphone, adjust

will

deflect

when

the

volume

sound

level is

back

to "FORWARD", the

starts.

directly

frc;>m

cord

extension

of

the

cord

plug

recorder.

from a radio, connect

terminals

coil

using alligator

change

the

alligator

from a record

cord

to

the
of

red

the

lead

from a radio

you

do

not

receive a shock

a s

hock

selector

.

on

into

an

AC

the

power

below

microphone

into

the

knob

to
recording
the

function

the

volume

to

the

border

i!i

at

adjusted,

radio

into

the

or

the

clips

of

clips

.

player, connect

output

record

lead+

player

without a power

is

felt,

re-in

is

turn

ed

the

power

source

the

recorder

lOOV

's

left

outlet, turn

source on,

:

microphone

proper

button

control

line

maximum

if

the

tape

or

record

tape

in

sele

ctor

between

.

function

begins

jack

speed .

the

direction

knob, past

knob

player

selector

"Radio" jack located

the

two

the

and

extension
terminals

extension

the

the

red

black clip

cord

cord.

.

transformer

when

the

touching
power

D ",

the

sert

to

"REWIN

cord
side

the

thread

located

so

that

the

red

to

run

using

to

of

the

clip

of
to

the

source

tape

FAST FORWARD

Turn

the

function

STOP

to

F.

,

FWD ;

reel.

INST

ANT

STOP

■

When

it

reproducing,

is

turn

STANT STOP.

■

To

continue

from

INSTANT

Notes:

(1)

Determine

ing

:

Tape

speed

Characteristics

If

,

Application

examples

Possible

(2)
selec
(3)
source
be

recording

time

When

changing

tor

to

STOP

When

this

frequency

changed. Replacement

selector

the

necessary

the

The

tape

recording

STOP

to

which

speed

Good

short

Music

W/7"

ways

W/5"

ways
(

tape

tape

position

tape

recorder

is

different, the

tape

will

to

stop

function

stops

or

playing,

FORWARD .

to

7.511/s

sound

quality

recording

tape

- 1

tape-33

thickness-50

speed , be

first

.

is used

capstan

counterclockwise, past

wind

the

selector

rapidly

tape

from

on

during

FORWARD

the

instantly.

turn

the

operating

use in

hour

min.

but

time

both

both

µ) (

in

motor

is

rcording

sure

an
wiring

inside

from

3.75

Sound

quality

good

as

but

recording

longer

Lectures, etc

W/7"

tape

- 2

ways

W/5"

tape-65

ways

tape

thickness-50

to

turn

area

where

and

the

pad

the

capstan

INSTANT

take

recording

to

the

follow

"/s

is

not

speed

7.5"/s
time

.

hours

min.

function

the

power

cover

.

up

or

IN-

knob

-

as

is

both

both

,,)

must

PLAYING BACK

■

If

the

the

■

function selector

tape

begins

Turn

the

required.

■

When

the
extension
of

the

recorder

of

the

cord

■

To

amplify

a

separate

jack, connect

resistor (3W

to

this

resistor

30

tape

use

cord

plug

to

the

the

amplifier,

the

) and

.

to

run

speed se

of

an

into

and

connect

speaker

reproduced

insert

alligator

then

is

turned

and

recordin

lector

external

the EX. SP

the

voice

output

the

clips

connect

from

" STOP "

g is

to

either 3.75

speaker

jack

alligator clip

coil.

of

extension

on

the

other

the

input

reproduced

to

"/s

is

desired, insert

located

s on

the

tape

cord

plug

end

of

the

amplifier

" FORWARD

.

or

7.5 "/s as

at

the

left

the

other

recorder

into EX.

across

the

",

the

side

end

using

SP

8 n

across

(3)

FEATURES

CD

LEVEL

This
Adjust

@

RECORDDING

This lamp

®

REWIND

©

TAPE

Select

s

TAPE

This

®

TAKE-UP

(J)

FUNCTION

REWIND ....

STOP .. . .

FORWARD

INSTANT

F. FWD

@

9

13

l

VOLUME

Turn

®

TONE

When
when

@

PAD

@

PILOT

When

@

HEAD

@

CAPSTAN

@

PRESSURE

@

RECORDING

When
knob

@

MONITOR

Plug
reproducting

@

RADIO/PHONO

In
from

@

MICROPHONE

In
phone

@

POWER

Insert

@

EXTERNAL

When
speaker

INDICATOR (LEVEL

meter

indicates

so

that

its

needle

LAMP

goes

on

when

REEL

SPEED

either

SELECTOR (TAPE

3¾ "/sec.

SCALE

scale is

for

marking

REEL

LEVER

For

rewinding

To

stop

When

forward

or

When

is

fed

the

....

playing

the

forward

When

tape

a

recording

STOP."

the

tape

....

moves

STOP

....

CONTROL (VOLUME

clockwise

clockwise

to

to

decrease

turn

CONTROL (TONE (SOFT

this

knob

is

turned to"

turned

to "Clear

CAVER (BELSONA

LAMP (PILOT

the

power

source

COVER

ROLLER

BUTTON

recording,

.

press

JACK (MONITOR

an

earphone

into

.

JACK (RADIO

sert

the

extension

radio

or

record

JACK (MIC

sert

the

microphone

for

recording

.

SOCKET (AC

the

AC

power

SPEAKER (EX

the

use

of

this

an external

jack.

to

the

level

will

(REC)

recording.

or

7 ½ " /sec .

the

tape, turn

tape, turn

the

knob

.

it

is n

operation, turn

knob

indicator

rapidly.

on and i
volume

,"

the

)

LAMP

)

is on,

(REC)

this

button

this

jack

cord

plug

player

.

)

plug

into

)

supply

cord

SP)

METER

of

the

not

swing

SPEED

speed using

end

of a recording

function lever

the

is

turned

ecessary

)

ncrase

and

CLEAR

Soft

,"

high

tones increase

this

lamp

and

)

when

)

into

this

jack

plug

speaker

)

sound

being

into

the

recorded

red area.

)

this

knob

.

on

the

tap

to"

function lever to" STOP."

to

to

stop

the

knob

is

brought

volume; turn

turn

off

.

REWl~D

" FORWARD,"

the

tape

during

to"

INSTANT

to

this

marking,

conuter

the

))

the

bass

sounds

goes on.

turn

the

monitoring

this

jack

when

into

the

is

desired, connect

.

function

recording

when

using

socket.

increase

lever

recording

the

micro

the

.

e.

."

;

or

-

31

BLOCK

DIAGRAM

ERA

SE

HEAD

ThPLAY

REC./PLAY
HEAD

PLAY

REC

MICROPHONE

-

----

REC

VOLTAGE

12 AX 7

PLAY

----

REC.

----

TONE

CONTROL

NOISE

ELIMINATING

---

----~

VOLUME

CONTROL

, ~

- -

VOLTAGE

l2

AX

LEVEL

INDICATOR

--

7

CURRENT

~ I

STABILIZ

HIGH
COMPENSATOR

ING

TONE

EACH CIRCUTI S

MONITOR

OSCILLATOR

CI

RCU

IT

EXTERNAL

SPEAKER

~

LINE IN

CIRCUIT DIAGRAM

ERASE

I

H

Cl=

=;

REC./

PLAY

H EAD

JI

TRA-722

z

1oo

oc1s 2 an

R

311

~z~

,o~

o;o'

~

,s

~4~7~K;!l;::=

R

20011

V,

12AX7

=====

=-

__:_

-

-~·--

-~~

C21

IOOP

6MOTOR

~~~~~

~~~

~~~

~~~~

-

C

-~~~-

19 SOP

R26

2201(

V2 6 B M 8

-~~~~

~~

~~~~~~~~~--~~--

~

~~

~~~~::~~~~~~;]

ab

3 n

cd

4 n

de

on

32

n,

2.2

Notes:

I.

Units

n,

/<F

and F have been omitted.

2. Resistance

values of the parts

va

lues shown in D are

with

wound parts.

the DC

resistance

Part

Name

Power

transformer

Power

transformer

Va

cuum
Vacuum
9
9
Oscillator coil
2
4
3
6
Rubber
Slids
Semi
Semi variable
Semi variable
Output
Capacitor
Carbon

Oil

Ceramic

El

Capacitor
Brush
E
Crystal
Power
Splicing
Le
Pilot
Lamp
Jack
Jack
Jack (with
Jack (with

tube
tube 6BM8

pin

wafer

pin

socket

pole

terminal

pole

terminal

pole

terminal

pole

terminal

cushio

switch

variable resis

transformer

film resi

paper

capacito

ectrolytic

for

xtension co

earpho

source

tape

vel

meter

lamp

socket
washer
cellar

socket

capacitor

hold band
band cleanin

red
white

12AX7

socket

for

miniature

plate
plate
plate
plate

n

resistor
capacitor

stor

r

capacito

rd

ne

cord assem

point

point

for

100I120V

for

210/230V

for

miniature

tube (with clamp

tor

5M

½W

!Mn

½W

470kn

½W

470k

½W

220kn

½W

220kn

½W

120kn

½W

l00k

½W

½W

!Ok
47kn

½W

39kn

½W

33k

½W

l0k

½W

12kn

½W

4.7kn K

½W

3.3kn K

½W

2.7kn

½W

2.

2kn

½W

680kn

½W

330kn

½W

390

2 W
2W

l.8kn

2.2

½W

3kn

2W

0.1 ,,F M

M

0.051,F

0.01 µF X

0.
22000

r

20+20+20+20

mark

K

005

/'F

PF J TV. 2000

50PF

K 500WV

150PF X 500WV
500PF X 500WV
250PF X 500WV
300

PF J

l0

µF 25WV

8+ 8 + 2+ 21,F

350WV

20

1,F

30

µF

g

bly

)

mark

)

n K

n J

n K
~

n K
n K

n K

n K

400W
400WV
400WV
400WV

6WV

K

K

K

J
J

J
J

K

J

K

J

K

K

K

K

50WV

µF

V

V DC.

350
350

WV
WV

)

Stock

411618
411419
572724
572447
541010

541144
313516
544402
544384
544248
544404
596044
532114
1590

23

1

590

11
283088
453066
541089
1235

60
123533
123563
123190
123564
123187
123180
1

23521
123121
1

23149

123469
123470

123441
123124
123380
123381
123382
123110
123586
123530
126291
126376
122206
126365
21600
215503
215551
214553
291174
232804
233813
233409
23340
233035
258005
258553
258509
258019
258033
599047
958166
593114
592038
593276

514203
594004
541042
633594
635593
543082
543083

4

1

No.

No./100

unit

Part

Name

Power sour
Record/play
Erase head
Muting switch assemb
Variable resis
Variab
Fu

se

Fu

se

EVA-4

Speake
Co

nne
Board swit
Case cov

Catch
Hin
Hin
Catch
Pad
Head
Cover
Pushing
Function
Felt
Alttention cord
Rubber
Case
Cabi
Jack
Level
Lamp

H

ead
Pressure
Dressing
Tape
Ball
Speed selection
" E"
Rewind
Rewind
Crip
Idl

er
Capstan screw
Capstan
Capstan
Take
Take up pul
Take
Fib
Fiber
Fiber
Br

ake
Cam

le res

holder

indu

r

ctor

clip
ge clip
ge hol

holder

cover

cover

cuhion

for vol

bottom

net

frame

meter

cove

adjusting

guide

rin

ring

whee

up

up pull

er

washer
washer
washer

rubber

spacer

ce

socket

head

tor

istor

assembly

ctio

n m o

ch

er

assemb

der

metal
metal

cover

assembly

screw

se l

ector

ume

assembly

leg

cover assembly

cushion

r

spiring
roller
washer

g

idler

bait

idler

pulle

l

for

50

c/s

for

60c

/s·

pulley

assembly

ley

hymeron

ey

C

cushio

knob

control

for

knob

y

ly

tor

assembly

ly

pressure

n

assemb

knob

for

100/120V
210/230V 514103

ly

roller

Stock

542132
513092
513069
539063
1535
153032
439380
591005
514107

526087
638062

539070
611190
623951
623948
623950
623952
958004
958011
958002

638422

646539

639717

758156

596033

611191

621173

623962

637088

635588

635608

635617

635634

663103

635615

638061

638399
638054
638053
630330
639830
6356
635595
635585
638025
638552

638030

637120

638551

637121

948033

630135

36

11

No. No./100

unit

33