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TABLE

OF

CONTENTS

SPECIPICALIONS

oe

a

es

MEASURING

METHOD

3.0650

00a

Sete

a

CONTROL:

LOCATIONS

©

eee

eee

a

ale

eer

a

eae

DISASSEMBLY

OF

TAPE

TRANSPORT

UNITS

&

AMPUIPIPRS

3.

Sito

3

tie

eee

Se

ee

yee

ae

es

TRANSPORT

MECHANISM

.

MECHANISM

ADJUSTMENT

AMPLIFIER

ADJUSTMENT

.

MAIN

FENANCE

PROCEDURE:

oc

iu5.

Viena

eae

COMPOSITE

VIEWS

OF

COMPONENTS

TROUBLE

SHOOTING

CHART

ea

oe

a

an

SCHEMATIC

DIAGRAM

* *

«

.

.

«

. *

*

.

« *

a

.

*

*

.

e

*

* .

*

*

*

«

*

« *

«

ry

° * .

. . *

.

* *

*

*

*

«

*

* . * .

*

* * *

*

*

.

° « . .

. .

*

*

a

.

When

placing

order

for

parts,

please

use

separate

PARTS

LIST

or

PRICE

LIST

FOR

PARTS.

mn

WD

bY

LI

13

ie

16

18

l.

SPECIFICATIONS

RECORDIING

SYSTEM

Cross-Field

Head

recording

system.

PLAYBACK

SYSTEM

:

In-Line

4

track

stereo/monaural

play-

back

system.

TAPE

SPEED

1-7/8,

3-3/4,

7-1/2

ips

(15

ips

op-

tional)

TAPE

SPEED

DEVIATION

Within

+

1.5%

at

all

tape

speeds.

WOW

AND

FLUTTER

:

Less

than

0.15%

r.m.s

at

7-1/2

ips.

(Playback

only)

Less

than

0.20%

r.m.s

at

3-3/4

ips.

Less

than

0.30%

r.m.s

at

1-7/8

ips.

FREQUENCY

RESPONSE

30

to

22,000

Hz

at

7-1/2

ips.

(+3

dB)

30

to

18,000

Hz

at

3-3/4

ips.

30

to

9,000

Hz

at

1-7/8

ips.

SIGNAL

TO

NOISE

RATIO

:

Better

than

46

dB

DISTORTION

With

in

3%

at

1,000

Hz

OVU

recording.

CROSS

TALK

Less

than

—65dB

(Monaural)

Less

than

—43

dB

(Stereo)

ERASE

RATIO

Less

than

—70

dB

for

all

tracks

EQUALIZATION

Correct

equalization

for

playback

of

tapes

recorded

to

the

NAB

curve.

RECORDING

BIAS

FREQUENCY

:

60kHz

+5

kHz

1.228

V

(+4dB)

at

using

250

Hz

OVU

recorded

tape.

Required

Load

Impedance...

More

than

25

k-Ohms

OUTPUT

(LINE)

DIN

OUTPUT

0.4

V

(—6

dB)

using

a

250

Hz

OVU

recorded

tape.

Impedance

10

k-Ohms.

Required

Load

Impedance...

More

than

50

k-Ohms

INPUT

LEVEL

Line...20mV

(—32dB)

to

2.5

V

(10

dB)

Impedance

..

.

390

k-Ohms

Mic

0.5mV

(—64dB)

to

50mV

(—25

dB)

Impedance...

50

k-Ohms

High

...more

than

20

mV

(—32

dB)

Impedance

..

.

390

k-Ohms

Low

...more

than

5

mV

(—44

dB)

|

Impedance

..

.

68

k-Ohms

F.FORWARD

AND

REWIND

TIME

90

seconds

using

a

1,200

ft.

tape

at

50

Hz,

75

seconds

at

60

Hz

HEAD

PHONE

OUTPUT

30

~40

mV

Impedance

8

Q

100

to

240

V

AC,

50/60

Hz

DIN

INPUT

LEVEL

POWER

SUPPLY

POWER

CONSUMPTION

S55

VA

INSULATION

RESISTANCE

More

than

50

M-Ohms

In-Line

4

track

stereo/manaural

MOTOR

Hysteresis

synchronous

2

speed

motor.

Horse

Power...

1/100

HP

Power

Ratio...

85%

Revolution

...

3,000

and

1,500

r.p.m.

at

50Hz.

3,600

and

1,800

r.p.m.

at

60

Hz

Condenser

capacity

...

2.8

uF

at

50

Hz

2.0

uF

at

60

Hz

HEADS

Recording/playback

head

4

Track

Gap

2

microns

Impedance

...

1.2

k-Ohms

at

1,000

Hz

Bias

head

4

Track

...

Gap

0.2

mm

Impedance

...

500

Ohms

at

60

kHz

ERASE

head

4

Track

...

Gap

0.2

mm

Impedance

...

500

Ohms

RECORD

LEVEL

INDICATOR

:

Vertical

indication

Model

‘‘A”’

VU

meter

x

2

TRANSISTORS

USED

:

2SC650

(A)

x

4

2SC281

(B)

x

4

2SC458

(B)

x

2

28C971

(2)(3)

x

2

DIODES

USED

IN34A

x

2

SW-05-02

x

2

STYLE

Portable

DIMENSIONS

13-1/2"

(H)

x

13-1/2”

(W)

x

9"

(D)

(340

H

x

340

W

x

230

D

mm)

WEIGHT

30.8

lbs

(14

kg)

Wl.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

1.

Method

involving

use

of

pre-recorded

tape.

For

measuring

the

tape

speed

deviation,

play

back

a

pre-recorded

tape

at

1,000Hz

+

0.1%.

Connect

the

appropriate

output

to

a

frequency

counter

meter

in

order

to

measure

the

tape

speed

deviation

from

the

pre-recorded

tape.

2.

Method

involving

use

of

timing

tape.

(designed

for

tape

speed

measurement)

This

method

utilizes

a

timing

tape

marked

at

intervals

of

7-1/2”.

The

running

time

of

over

60

marked

sections

of

tape

is

measured

in

order

to

calculate

the

deviation

of

the

tape

speed.

In

applying

this

method,

however,

it

should

be

kept

in

mind

that

timing

tape

stretch

or

contract

measurement

error

is

inevitable,

so

that

it

is

necessary

to

measure

the

total

length

of

the

tape

in

advance.

WOW

AND

FLUTTER

Playback

a

3,000

Hz

pre-recorded

tape

of

which

the

wow

and

flutter

level

is

guaranteed

to

be

smaller

than

0.07%

for

measurement

by

means

of

a

wow

meter.

It

is

also

possible

for

a

3,000

Hz

sine

wave

to

be

recorded

and

played

for

measurement

by

means

of

the

wow

meter.

In

this

case,

however,

the

wow

meter

indicates

a

value

as

much

as

twice

the

value

given

in

the

specifi-

cations.

SIGNAL

TO

NOISE

RATIO

X-165D

_

Set

the

Equalizer

Switch

to

“7-1/2”

ips

position

and

playback

a

tape

containing

a

250

Hz

sine

wave

recorded

at

“0”

VU

level

on

a

standard

recorder.

Connect

a

V.T.V.M.

to

the

line

output

jack

of

th

recorder

and

measure

its

output.

|

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

each

of

the

measured

values

into

decibels.

TOTAL

HARMONIC

DISTORTION

FACTOR

1

kHz

Audio

Distortion

Oscillator

Meter

Connect

the

measuring

instrument

as

shown

above,

and

record

a

1,000

Hz

sine

wave

at

“OQ”

VU.

Playback

the

resultant

signal

and

measure

the

overall

distortion

factor.

Measure

the

noise

level

of

the

tape

recorder

with

the

tape

removed

;

connect

the

audio

oscillator

directly

to

the

distortion

meter

for

measurement

of

the

distortion

factor

of

the

oscillator.

The

required

distortion

factor

can

be

obtained

from

the

results

of

the

above

measurement

by

the

following

formula.

do

=

d—d,

—d,

where,

do

=

Required

d

=

Overall

distortion

factor

d,

=

Noise

level

d,

=

Distortion

factor

of

the

oscillator

(Note

:

New

tape

of

particularly

good

quality

should

be

used

for

measurement

of

the

distortion

factor.)

POWER

OUTPUT

Playback

a

tape

containing

a

250

Hz

sine

wave

recorded

at

O

VU

on

a

standard

recorder.

Connect

a

V.T.V.M.

to

the

line

output

jack

of

the

recorder

and

measure

the

voltage

at

the

output

of

the

recorder

to

be

tested.

ae

a

ee

ee

eee

ae

ey

ry

CROSSTALK

(Crosstalk

between

the

tracks)

(TAPE)

@

2

}

|

BRA

AICS

Tl

Tape

direction

@—-+(WW

wut

Roe

-

Tape

direction

As

shown

in

the

figure,

first

record

a

1,000

Hz

sine

wave

on

track

No.3

at

+3

VU

level.

Next,

remove

the

1,000

Hz

input

signal

and

record

under

a

non-input

condition.

Then,

playback

the

tape

on

track

No.3

and

No.

1

(reversed

condition

of

tape)

through

the

1,000

Hz

B.P.F.

(Band

Pass

Filter,

Sensitivity

...

1:

1)

and

obtain

a

ratio

between

the

two

from

the

following

formula.

Eo

=

201

C

og

E,_E,

(dB)

C

=Desired

crosstalk

ratio

(dB)

be

=

7

3]

Eo

=

1,000

Hz

signal

output

level

TOTTI

E2

=

1,000

Hz

crosstalk

output

level

reer

E,

=No-input

signal

record

level

FREQUENCY

RESPONSE

Audio

Frequency

F-

Oscillator

Connect

the

measuring

instrument

as

shown

in

the

above

diagram,

and

measure

the

frequency

response

according

to

the

following

sequence

:

RECORD

:

1)

Supply

a

sine

wave

of

1,000

Hz

to

the

Line

Input

of

the

recorder

being

tested,

through

an

attenuator

from

an

audio

frequency

generator.

2)

Set

the

Mode/Selector

Lever

to

“Rec”

position

and

adjust

the

line

input

volume

so

that

the

VU

meter

needle

indicates

“0”

VU.

3)

Under

the

condition

described

in

(2),

lower

the

input

level

16

dB

with

the

attenuator.

4)

Record

the

spot

frequency

from

the

audio

frequen-

cy

generator

in

the

range

of

30

Hz

to

25,000

Hz.

PLAYBACK

:

5)

Set

the

Equalizer

Switch

to

7-1/2”

or

3-3/4”.

6)

Connect

a

V.T.V.M.

to

the

Line

output.

7)

Playback

the

previously

recorded

tape.

8)

Adjust

the

output

level

to

“O”

dBm

at

1,000

Hz

(indicated

on

the

V.T.V.M.

Range

selector)

9)

Playback

the

recorded

spot

frequencies

under

the

conditions

in

(8),

make

a

memo

of

Output

Level,

and

plot

the

value

on

a

graph.

Ree}

Retainer

(Left)

Speed

Change

Switch

Supply

Reel

Shaft

Take-Up

Reel

Shaft

Cycle

Conversion

Switch.

‘A)

Reel

Retainer

(Right)

Capstan

Storage

Post-

tation.

WCU

Ee

j

=

Vapstan

Shaft

Track.

Selector

Knob

=

i

Capstan

Head

Cover.

(A)

Pinch

Wheel

Tape

Guide

Automatic

Shut-

Off

Lever

Tape

Cleaner

Record/Playback

Knob

Tape

Cleaner

Release

Button

Pause

Lever

Index

Counter

Reset

Button

Fast-Forward/Rewind

Knob

;

Head

Cover

(B

Recording

Level

Control

Knob

(Right

/-

—Recording

Safety

Buttc

S

ron

Automatic

Shut-Off

Switch

Equalizer

Switch

Recording

Lamp

Microphone

Jack

‘Left)

Stereo

Headphone

Jack

Microphone

Jack.

(Right)

Recording

Level

Control

Knob

(Left)

VU

Meter.

(Right)

Power

Switch

“VU

Meter

CUE

RLS:

—Fuse

Post

Voltage

Selector

Cycle

Conversion

Switch

(B)

AC

Cord

DIN

Jack

and

High/Low

Input

Selector

Switch

Line

Input

Jack

(Left)

Line

Output

Jack

(Left)

Line

Output

Jack

(Right)

f

Line

Input

Jack

(Right)

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Reas-

semble

in

reverse

order.

CAPS

PINCH

WHEEL

PINCH

WHEEL

gMECH.

PANEL

ee

psp

“AMP

BLOCK

~]

1.

CAPSTAN

DRIVE

Figure

1.

(A)

Motor

(B)

Drive

Belt

(flat

belt)

(C)

Capstan

(D)

Flywheel

High-speed

rotation

of

Motor

(A)

is

transmitted

by

Drive

Belt

(B)

to

Capstan

(C),

which

is

connected

to

a

flywheel

that

provides

necessary

inertia.

This

flywheel

maintains

the

rated

rotation

and

absorbs

minor

rotation

variations

of

the

motor.

Capstan

Rotation

:

606

R.P.M.

at

7-1/2”

(19

cm)

per

sec.

303

R.P.M.

at

3-3/4”

(9,5

cm)

per

sec.

151.5

R.P.M.

at

1-7/8”

(4.74

cm)

per

sec.

Motor

Rotation

:

3,000

to

1,500

R.P.M.

at

50

Hz

3,600

to

1,800

R.P.M.

at

60

kHz

2.

PINCH

WHEEL

DRIVE

Place

tape

between

the

rotating

capstan

and

pinch

wheel

and

push

pinch

wheel

against

capstan

to

transport

the

tape

at

rated

speed.

The

proper

pinch

wheel

pressure

is

between

1,000

to

1,150

grams

at

the

tape

speed

of

7-1/2”

(19

cm)

per

second.

3.

RECORD

AND

PLAYBACK

MECHANISM

a

Turning

the

RECORD/PLAYBACK

LEVER

(A)

to

Slipping

Rotation

ER

;

:

Gy

Fa

O

“PLAY”

position

causes

the

pinch

wheel

to

press

against

le

NN

the

capstan

and

move

the

tape

at

the

rated

speed.

At

the

same

time,

Idler

(B)

moves

between

Motor

Bushing

(C)

and

the

Take-Up

Reel

Spindle

(D)

to

transmit

the

motor

|

rotation

to

(D)

so

that

the

tape

is

moved

and

wound

on

)

the

take-up

reel.

The

Take-up

Reel

Spindle

Base,

composed

of

two

plastic

wheels

(discs)

(1

and

2)

witha

felt

clutch

between,

is

rotated

from

below

by

the

idler.

Tape-winding

friction

is

adjusted

by

the

slipping

of

the

felt

and

maintains

rated

winding

of

the

tape.

The

Supply

Reel

Spindle

(H)

has

a

Brake

Roller

(E)

contacting

plastic

wheel

(disc)

(4)

from

below which

provides

appropriate

back

tension

by

the

slipping

of

the

felt

clutch

to

the

rotation

of

the

Pulley

(3)

above.

To

prevent

accidental

erasure,

the

Record

Interlock

Button

(F)

must

be

depressed

before

the

RECORD/PLAYBACK

LEVER

can

be

moved

to

the

“REC’’

position.

Safety

device

(G)

is

depressed

to

operate

the

recording

mecha-

nism.

2

(See

figure

2)

AWWA

4.

FAST-FORWARD

MECHANISM

Turning

the

FAST

FWD-REWIND

knob

(A)

to

“FAST

FWD”’

position,

causes

the

cam

(B)

under

the

knob

to

push

up

Lever

(C).

Idler

(D)

moves

into

the

space

between

Plastic

Roller

(F)

above

the

Take-Up

Reel

Spindle

and

the

upper

part

of

the

rotating

motor.

drive

|

bushing

to

transmit

the

motor

rotation

to

the

take-up

|

reel

spindle.

At

the

same

time,

Brake

Rollers

(H)

and

(1)

comes

off

the

reel

spindle

to

free

the

Supply

Reel

Spindle

(G),

thereby

allowing

fast

winding

of

the

tape

onto

the

take-up

reel.

(See

figure

3)

Free

Rota

5.

REWIND

MECHANISM

Turning

the

FAST

FWD-REWIND

knob

(A)

to

“RE-

WIND”

position,

causes

the

cam

(B)

under

the

knob

to

push

Lever

(C)

up.

Idler

(D)

moves

into

the

space

between

the

upper

part

of

the

rotating

Motor

drive

bushing

(E)

and

the

Intermediate

Pulley

(F)

to

/

transmit

the

high-speed

rotation

of

the

motor

through

:

:

ODF

NS

aa

{

—

the

intermediate

pulley

to

the

Supply

Reel

Spindle

(G).

eee

2

os

ee

i

the

same

time,

Brake

Rollers

(H)

and

(1)

come

off the

ee

:

~

©

reel

spindle

to

free

the

take-up

reel

spindle

(J),

thereby

rewinding

the

tape

onto

the

supply

reel

at

a

fast

speed.

|

(See

figure

4)

Free

Rotation

ae

if

Or

thee

deo

i

i

ie

RAL

ee

pte

Fig.

4

serena

oo)

6.

STOP.

CONTROL

gee

ree

newine

ee

|

Turning

the

stop

lever

to

the

“STOP”

position,

causes

/

foo

=

lerwheel

fe

\

a

\

|

|

|

Brake

Rollers

(A)

and

(B)

to

depress

the

reel

spindles

and

stop

rotation.

\

As

the

brake

rubbers

depress

the

plastic

rollers

below

the

Se

'

reel

spindles,

no

friction

is

applied

to

the

tape.

(A)

\

oe

“(See

figure

5

,

side

Brake:

ace

=

|Idlerwheel

;

a

eh

.

2

eg

‘C

LT

A

=

><

ea

cd

|

Ne

oe

ae

el

See

ee

eas

x

EN

po

-Capstany

iN

O

i

|

Head

o

ae

Li

fER

Ss

Saee

=

Block

|

|

Pinch

|

(CaM)

Guide--Roller:

Genes

DU

Wai

eee

wee)

ies

ete

Pinch

Take-up

|

Rewind

|

Take-up

|

Supply

a

Modes

of

Operation

Wheel

Idler

Idler

side

side

Wheel

Wheel

|

Brake

Brake

L

(a)

STOP

x

x

x

0

.

(b)

FAST-FORWARD

x

O

x

x

x

(c)

REWIND

x

x

O

x

x

RECORDING

5

;

;

(2)

PLAYBACK

:

ss

x

x

°

NOTES

:

X-Marks

indicate

“open”

and

o-marks

“engaged”