Akai M8 Manuel utilisateur

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MODEL

NUMBER

:

WEIGHT

(NET

IN

CARTON):

DIMENSIONS

POWER

REQUIREMENTS

:

POWER

CONSUMPTION

:

‘RECORDING

SYSTEM

:

PLAYBACK

SYSTEM

:

TAPE

SFEED

TAPE

SPEED

DEVIATION

:

WOW

AND

FLUTTER

:

FAST

FORW..RD

AND

REWIND

TIME:

FREQUENCY

RESPONSE

:

DISTORTION

SIGNAL-TO-

NOISE

RATIO:

CROSS

TALK

|

SPECIFICATICNS

ere

errr

en

TS

Akai

Model

M-8,

portable

4-track

stereo

tape

recorder.

47.3

lbs.

2.4

Ibs.

supplied.

20°H

-:13’W

49’D,

overall,

case

clo-

sed.

(510H

340W

x

226D

in

m/m)

{21.5

kg.)

for

M-S

il.l

kg.)

for

ell

accessories

A.C.

100,

110,

129,

200,

220,

or

240

volts

interchangeable.

50-60

cycles.

100

VA.

Specific

“cross-field”

recording

based

on

the

theory

of

trailless

recording

bias

system.

Inline

4

track

stereo

and

4-track

monaural

recording.

Inline

4-track

stereo,

monaural

play-

back.

Three

speeds;

7'4”

(19cm.),

3-34”

(9.50em.)

and

1-%*

(4.75cm.)

per

second,

115”

second

with

an

acces-

sory

capstan

and

pinch

wheel.

Less

than

+3

per

cent

at

all

tape

speeds.

Less

than

0.15%

at

7-%

ips.

R.MS.

Less

than

0.2570

at

3-%

ips.

R.M.S.

Less

than

9.35%

at

1-

ips.

RMS.

SO

seconds

for

1,200

ft.

tape

at

50

cycles

and

75

seconds

at

60

cycles.

30

to

25.000

cps.

at

7-'%

ips;

£3

db.

40

to

21,000

cps.

2+3db.40

to

18,000

cps.

+4db.40

to

10,000

cps.

Within

2%.

at

1,000

cps,

hermonic:

at

7-4

ips;

at

3-34

ips

;

at

1-%

ips.

OVU

«total

40

db

below

recorded

level

signal

at

all

speeds.

Within

53

db

beiween

each

track.

CHANNEL

SEPARATION

:

POWER

INPUT

LEVELS

:

POWER

OUTPUT:

INSULATION

RESISTANCE:

INSULATION

YIELD

STRENGTH

:

MONITORING

yvorpiur.

SYSTEM

:

MOTOR

HEADS

MICROPHONE

USED:

SPEAKER

INCLUDED:

TUBES

USED

REELS

USED

RECORDING

LEVEL

INDICATOR:

a

TO

er

pe

rary

snaeminsetiee

a

a

EY

A

He

meme

ee:

Better

than

80

db

at

1,000

cps-i

3

VU.

Microphone

input

level

-55

db

(VR.

max}

at

1,000

cps.

Phono

and

radio

input

level

-15

db

(VR.

max)

at

1,000

cps.

Head

output,

1

mv.

at

1,000

cps.

Pre-Amplifier

output,

0.6

V

at

1,000

cps,

impedance

10,000

ohms

Main

outrnnt,

34

dbm.

up

(in

600

ohms).

fy

More

than

10

MEG

ohms

More

than

one

minute

at

A.C.

1,000

¥

with

Headphone

With

headphone

(8

ohms)

during

recordin:

Hysteresis

two-speed

motor,

dynamically

talanced.

1/100

HP.

Power

ratio,

70

per

ceni..

3,000

to

1,500

r.p.m.

at

SO

cps,

synchronous,

~

3600

to

1,800

r.p.m.

at

6C

cps.

Inline

four-track

stereo/monaural

re-

cord-play

head;

leadannn

SOND

shes

2t

1

000-

sm

PCGGHOS...

Guy

Sais

at

apy

&

Four-track,

cross-field

bias

head;

Impedance...14,000

ohms

at

60

ke.

Four-track

erase

head

Impedance...18.

000

ohms

at

60

ke.

Square-shaped,

dynainic

microphone

~

Impedance...56,000

chms

Sensitivity...

—55

db.

Frequency

Response...70

to

15,000

cps

=10db.

Two

4-inch

dynamic

speakers

for

vertical

stereo

sound

eifect

Impedance...8

chms

Allowable

Input...6

waits

Frequency

Response...80

to

12,006

cps,

2-10

db.

6267

\EF8Si

+2,

12ZAD7

.12AXK7i:-.2,

6BQ5»

2,

6%4.2,

BARS

«1.

Up

to

7”

reel

Horizonial,

A-model

VU

meter

I

HOW

TO

MEASURE

DESIGNATED

VALUES

IN

SPECIFICATIONS

TAPE

SPEED

TOTAL

HARMONIC

DEVIATION:

Record

the

1,000

cps.

sine

curve

of

DISTORTION

the

tape

speed

at

rating

speeds

with

FACTOR:

Provide

the

input

terminal

of

the

a

standard

sound

recorder

(AMPEX

351A,

for

instance)

which

is

little

af-

fected

by

the

tape

speed

deviation

throughout

the

whole

length

of

the

tape.

Put

this

standard

tape

on

the

tape

recorder

under

test

for

playing

back,

and

measure

its

output

by

a

counter,

then

convert

the

value

into

rating

power

frequency

to

evaluate

the

tape

speed

deviation.

For

a

rough

measurement,

the

tape

speed

deviation

can

also

be

measured

with

a

speed

test

timing

tape

by

the

count

on

a

stop

watch.

lested

recorder

with

1,000

cps.

sine

curve

signals

and

record

these

signals

on

a

recording

tape

at

the

zero

level

on

the

recorder‘s

internal

VU

meter.

Then

playback

the

signals

under

the

normal

recording

condition

to

meas-

ure

the

distortion

factor

by

an

oscil-

lator.

Remove

the

recording

tape

from

the

recorder,

then

read

the

noise

level

on

tne

oscillator

to

get

the

required

distortion

factor

by

the

following

formula:

dO=d—dli—d2

dO...required

d...overall

distortion

factor

dl...noise

levei

d2...distortion

factor

of

the

oscilla-

tor

used

NOISE:

Playback

the

sine

curve,

250

cps.

that

guarantees

wow

and

flutter

wiih-

tape.

recorded

on

a

glanclard

record-

in

0.07

per

cent,

and

read

the

effec-

tive

value

on

wow

meter

er

on

the

tested

recorder

to

measure

Since

the

sensibility

of

wow

and

the

voltage.

flutter

frequency

below

2cps.

and

Remove

the

tape,

then

measure

the

ahove

5cps.

drops,

the

frequency

noise

level

under

the

same

condition,

over

Scps.

is

put

to

3

db/OCT

cir-

cuit,

and

the

frequency

below

2

eps.

is

put

to

6

db/OCT

circuit

for

adjust-

ment.

This

adjusted

value

is

called

OUTPUT

:

Playback

on

the

test

recorder

the

auditory

compensated

value.

Calculate

the

ratio

betw2en

the

two

in

decibel.

WOW

AND

FLUTTER:

Playback

the

3,000

cps.

standard

tape

SIGNAL

TO

1,000

cps.

sine

curve

tape

which

was

reccrded

at

the

zero

VU

level

on

a

standard

recerder.

Terminate

the

test

recorder

with

eight

ohnis.

Square

the

voltaye

reading,

then

FREQUENCY

divide

the

figure

by

eight

ohms

to

RESPONSE:

Connect

to

the

input

terminal

of

the

(OVERALL

FREQU-

test

recorder

a

sweep

frequency

of

ENCY

RESPONSE)

the

level-20

db.

Record

the

sweep

CROSS

TALK

:

Record

1,000

cps.

signal

at

+3

VU

get

the

rms.

power

output.

signal,

playback

the

tape,

terminate

the

output

with

eight

ohms.

Read

the

frequency

response

which

should

have

a

maximum

deviation

of

6

db.

te

en

the

third

track,

then

playback

this

signal

thru

a

1,000cps.

Band

Pass

Filter.

Compare

the

output

of

tracks

1

and

2

in

decibels.

TI

LOCATION

OF

CONTROLS

SOUND

MIRROR

SPEED

CHANGE

&

ON/OFF

SWITCH

TOP

(DECK)

PANEL

TAKE-UP

REEL

SPINDLE

CAPSTAN

SHAFT

PINCH

ROLLER

CAP

PINCH

ROLLER

AUTOMATIC

SHUT-OFF

LEVER

INSTANT

STOP

LEVER

START

BUTTON

RECORD,

PLAY

SWITCH

REWIND,

FAST-FORWARD

SWITCH

RECORD

SAFETY

BUTTON

AUTO

STOP,

SHUT-OFF

SWITCH

RECORD/PLAY

HEAD

PILOT

LAMD

(RECORDING

INDICATOR)

INTERNAL

SPEAKER

ON/OFF

SWITCH

POWER

SWITCH

SPEAKER

OUTPUT

JACK

(LEFT)

TONE

CONTROL

(LEFT)

EQUALIZER

SWITCH

(LEFT)

VOLUME

CONTROL

(LEFT)

VOLUME

UNIT

METER

(LEFT)

SOUND

ON

SOUND

SWITCH

STEREO

HEADPHONE

JACK

FUNCTION

SWITCH

SPEAKER

OUTPUT

JACK

(RIGHT:

VOLUME

UNIT

METER

(RIGHT)

FEED

REEL

SPINDLE

GUARD

CIRCLE

weet

CYCLE

CONVERSION

SWITCH

CAPSTAN

STORAGE

POST

RETAINING

SCREW

TRACK

SELECTOR

KNOB

TAPE

GUIDE

ROLLER

’

TAPE

CLEANER

RELEASE

BUTTON

HEAD

COVER,

MAIN

ERASE

HEAD

INDEX

(REVOLUTION)

COUNTER

RESET

BUTTON

CROSS-FIELD

HEAD

DIN

(ONE

CONNECTION)

JACK

DICE

LD

INDUT

(LEET

CHANNET)

PRE-AMP

OUTPUT

(LEFT)

LINE

INPUT

(LEFT)

MICROPHONE

INPUT

(LEFT)

PICK

UP

INPUT

(RIGHT

CHANNEL)

PRE-AMP

OUTPUT

(RIGHT)

LINE

INPUT

(RIGHT)

MICROPHONE

INPUT

(RIGHT)

VOLUME

CONTROL

(RIGHT)

EQUALIZER

SWITCH

(RIGHT)

TONE

CONTROL

(RIGHT)

CARRYING

CASE

YHGFOHOSCBHOSHSOSHOSOOQQOGHOHOOO

SEDHOGHHHHHGHHHOOHOPHSHOLOGOLHO®

V

DISASSEMBLY

TO

REMOVE

TAPE

TRANSPORT

UNIT

&

AMPLIFIERS

(1)

Loosen

the

RETAINING

SCREW

(G)

of

PINCH

|

(3)

Disconnect

all

of

the

PLUGS

marked

(P1), (P2), (P3),

ROLLER

(H)}

using

a

Phillips-headed

screw

driver

to

|

(P4),

(P6), (P7),

(P8)

and

(P10)

by

hand.

remove

the

PINCH

ROLLER

(H)

by

hand.

Remove

HEAD

WHEEL

'D)

and

DECK

CONTROL

KNOBS

(I)

&

(J)

by

loosening

their

retaining

screws.

Also

take

off

all

of

the

screws

identified

from

(A)

to

re

(K}

to

remove

DECK

PANEL

IP).

Bee

DO

NOT

REMOVE

™

ales

i

ete

ee

tae

coe

am.

{4)

Loosen

ail

of

the

screws

marked

from

(A!

to

(L).

to

remove

VENTILATOR

(VY).

Pte

miet

kage

o>

2

Semen

er

ner

a

ecco

TT

{2}

Loosen

the

screws

marked

from

(A)

ta

(D)

in

order

(5)

Lift

the

LEFT

AMPLIFIER

“(L)

from

the

carrying

case.

"Use

a

soldering

iron

to

disconnect

soldered

ends

of

speaker

cables

and

remove

these

cables.

Now

re.

move

TAPE

DECK

(M)

from

the

case.

(7)

(6)

Lift

the

R/IGHT

AMPLIFIER

(R)

from

the

carrying

case,

a

eri

neni

ae

perintnt

ns

ilt

e

Pamstny

—-5

-

Fig.

1

y

TRANSPORT

MECHANISM

Driving

of

Capstan

Figure

1.

(A)

Motor

{B)

Driving

Belt

(flat

belt)

(C)

Capstan

(D)

Flywheel

High-speed

rotation

of

Motor

(A)

is

reduced

by

Driv-

ing

Belt

(B)

and

transmitted

to

Capstan

(C),

which

is

connected

tc

Flywheel

with

ample

inertia

and

enables

rating

rotation

by

absorbing

minor

rotation

distortion

of

.

motor

itself.

(see

Fig.

1)

Capstan

Rotation

606

r.p.m.

at

7-14"

(19

m.}

per

sec,

303

r.p.m.

at

3-34”

(9.5

cm)

per

sec.

151.5

r.p.m.

at

1-%*

(4.75cm.)

per

sec.

Motor

Rotation

3,000

to

1,500

r.p.m.

at

50

cps.

.

'

3,000

to

1,800r.p.m.

at

60

cps.

Driving

of

Pinch

Roller

Put

tape

between

rotating

capstan

and

pinch

roller

and

‘push

pinch

roller

against

capstan,

this

will

transport

the

tape

at

rated

speed.

The

appropriate

pressure

of

Pinch

roller

at

this

time

is

between

1,000

to

1,150

grams

at

the

tape

speed

of

7-14”

(19cm.)

per

second.

Recording

and

Play

Back

Tum

the

RECORD,

PLAYBACK

knob

{A}

to

"PLAY"

position,

and

pinch

roller

presses

hard

against

capstan

to

move

tape

at

the

rated

speed.

Aiihe

same

time,

idier

(Bj

moves

between

Motor

Bushing

(C)

and

the

Take-Up

Reel

Spindle

{D)

te

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

is

made

up

of

two

plastic

rollers

(1

and

2)

with

a

clutch

felt

in

between.

The

Idler

is

rotating

the

plastic

roller

(2)

below.

There-

fore,

the

tape-winding

friction

is

adiusted

by

the

slipping

of

the

felt

to

enable

rated

winding

of

the

tape.

On

the

other

hand,

the

Supply

Reei

Spindle

(Hj

has

a

Brake,

roller

(E)

hung

on

the

Plastic

Roller

(4)

below

which

provides

appropriate

back

tension

by

the

clutch

felt

slipping

to

the

rotation

of

the

Pulley

(3)

above.

To

prevent

accidental

erasure,

the

Record

Interlock

Button

(F)

must

be

depressed

before

the

RECORD,

The

Safety

device

(G)

is

depressed

to

enter

the

record

mode.

(See

Figures

2

and

3)

Braked

Rotation

Slipping

Rotation

o

SOF

f

Fig.

3

Modes

of

Operation

:

(a)

STOP

(b)

FAST-FORWARD

|

(c)

REWIND

(d)

RECORDING

PLAYBACK

|

pinch

[Pake-up

iRewind

'Take-

ae

der

|

‘Supply

‘up-side

iside

Roller

twreel

(Wheel

|

Brake

|

Brake

{dler

x

|

x

x

en

x

|

x

-O}

0

|

0

|

x

Oo

ee

Res

ele

NOTES:

X-marks

indicates

“open”

and

O-marks

“engaged”

FAST-FORWARD

MECHANISM

Turn

the

FAST

FWD-REWIND

knob

{A)

to

"FAST

FWD”

position,

and

fhe

cam

(B)

under

the

knob

pushes

up

fhe

Lever

(C}.

The

Idler

(D)

moves

into

the

space

between

the

Plastic

Roller

(F)

above

the

Take-Up

Reel

Spindle

and

the

upper

part

of

the

rotating

motor

drive

bushing

tc

transmit

the

motor

rotation

to

the

take-up

reel

spindle.

At

the

same

time,

the

Brake

Band

(H)

and

Brake

Roller

(1)

come

off

ine

reel

spindle

to

free

ihe

Supply

Reel

Spindle

(G),

thereby

allowing

fast

winding

of

the

tape

onto

the

take-up

reel.

(See

Figures

4

and

5}

Free

Rotation

High-Speed

Rotation

ROG

O

Fig.

5

'

REWIND

MECHANISM

Turn

the

FAST

FWD-REWIND

knob

(A)

to

"REWIND”

position,

and

the

cam

(B)

under

the

knob

pushes

the

Lever

(C)

up.

The

Idler

(D}

moves

into

the

space

between

the

upper

part

of

the

rotating

Motor

drive

bushing

(B)

and

the

Intermediate

Pulley

(F!

to

transmit

the

high-speed

rotation

of

the

motor

through

the

intermediate

puiley

io

the

Supply

Reel

Spindle

|G).

At

the

same

tim>,

Brake

roller

(H)

and

Brake

Band

(1)

come

off

the

reel

spindle

to

free

the

take-up

reel

spindle

(J),

thereby

rewinding

the

taps

into

the

supply

reel

at

2

fast

speed.

(See

Figures

6

and

7)

High-Speed

Rotation

Free

Rotation

Fig.

7

STOP

CONTROL

Push

the

stop

lever

to

“STOP”

position,

Brake

Roller

(A),

and

Brake

Band

1B)

depress

reel

spindles

to

stop

rota-

tion

of

the

reel

spindles.

As

brake

rubber

depresses

the

plastic

rollers

under

the

reel

spindles,

no

friction

works

on

the

tane

itself.

Rewind

Idlerwheel

Take-up

Reel

Spindle

Take-up

Side

‘e

ser

fo™®

Urake

Bard

f

°

Cy

.

|

°

=

@.

Swpply

Side

pe

owint

sho

pw:

brake

Raltoolg

:

Gaite

Koller

Suyply

Reel

Soindle

Fig.

9

AUTOMATIC

STOP

MECHANISM

When

the

tape

is

threaded

on

the

pin

(B)

at

the

top

of

the

Automatic

Stop

Lever

{A)

comes

off

the

pin,

the

Auto.

matic

Stop

lever

returns

to

the

original

position

by

the

action

of

springs.

At

this

time,

the

panel

spring

(C)

below

the

Automatic

Stop

lever

slightly

pushes

down

the

projected

part

of

the

eccentric

gear

(D},

which

gears

into

the

Flyweel

Gear

(E)

to

start

rotating

and

pushing

up

the

Momentary

Stop

Lever

(G}

thst

is

connected

with

the

eccentric

gear

base

(F).

Thus,

the

eccentric

gear

maintains

the

mechanism

in

the

state

of

tentative

stop

for

“Playback”

or

“Recording”.

For

“Fast-forwa:a’,

or

“Rewind”,

the

Corkscrew

lever

'H)

works

to

push

back

the

"FAST

FWD,

REWIND”

knob

to

the

“Stop”

position

before

stopping

itself.

When

the

Automatic

Cut-Off

Switch

is

moved

to

“CUT

OFF"

position,

the

Shut-Off

lever

(J)

moves

to

the

arrow-

mark

direction

to

cut

the

power

circuit,

thereby

depres-

sing

the

attached

Micro

Switch

(K)

to

shut

off

the

current.

(See

a,

b,

c

and

d

in

Fig.

9)

SOUND

ON

SOUND

MECHANISM

By

pushing

SOUND-CN-SOUND

BUTTON

{A)

while

the

recorder

is

set

to

recording

condi-

tion,

LEVER

(D)

is

depressed

and

LEVER

(C)

is

lifted

through

LEVER

(B).

Refer

to

Fig.

10-a.

As

a

result,

LEVER

'C)

is

veieased

from

stop-

per

of

SW-l

and

SW-1

is

reset

to

play

condi-

.tion

as

LEVER

(E)

is

pulled

by

SPRING

(F).

Refer

to

Fig.

10-b.

In

this

condition,

SOUND-ON-SOUND

device

is

operative.

If,

however,

SOUND-ON-SOUND

is

not

operative,

checx

all

of

the

foregoing

LEVERS

to

see

that

SW-1

is

set

to

play

condition.

Wo

ADJUSTMENT

OF

TAPE

TRANSPORT

UNIT

1.

ADJUSTMENT

OF

PINCH

WHEEL

It

is

important

that

the

pinch

wheel

shaft

be

kept

in

complete

alignment

with

the

capstan

shaft.

A

proper

pinch

wheel

pressure

is

between

1,000

and

1,150

grams

when

the

unit

is

operated

at

the

tape

speed

of

7-1/2

ips.

Any

deviation

from

this

specification

will

result

in

wow

and

flutter.

Check

pinch

wheel

pressure

using

a

spring

scale

and,

if

necessary,

adjust

the

pinch

wheel

load

spring

to

suit.

2,

ADJUSTMENT

OF

TAKE-UP

IDLER

WEEERL

The

take-up

idler

wheel

must

be

kept

in

complete

alignment

with

the

take-up

reel

shaft.

When

the

unit

is

set

in

fast

forward

condition,

the

idler

wheel

will

contact

to

the

upper

knurled

wheel

of

the

take-up

reel

shaft

assembly,

and

it

will

contact

to

the

lower

knurled

wheel

during

record

or

play

mode.

Adjust

idler

wheel

load

spring

so

that

the

idler

wheel

pressure

is

kept

between

50

and

80

grams.

The

idler

wheel

wears

rapidly

if

the

pressure

is

excessive,

and

slinpage

occurs

in

case

the

pressure

is

smaller

than

the

specification.

(0)

Rewind

reel

salt

asey.

(6

Tate—ap

reel

shaft

aser.

ine

———omoe

Fetainer

ee

nylon

washer

ailite

wetat

a

itive

metal

re

mu

plate

3

star

shaped

TN

shsapeiog

ewe

!

ravsiner

——"

hh

ites

B

Se

ectainer

|

cr

i

if

han

sprog

_

ae

t

:

}

alley

Cee

ei¢

p<

ser

}

Ce"

‘

Fig.

ll

Recording

Tape

25meau

0.125mm

0.025mm

VOTE

VF

Yh

Wy

Bias

Head

PLEA

Ree

/

Play

Head

ae

+

Erase

Head

Ree/

Play

Head

Fig.

12

me

3.

ADJUSTMENT

OF

REWIND

IDLER

WHEEL

The

rewind

idler

wheel

must

be

kept

in

complete

align-

ment

with

the

rewind

reel

shaft.

The

amount

of

pressure

to

the

knurled

motor

bushing

should

be

maintained

about

50

grams

during

rewind

operation.

Adjust

both

the

idler

load

spring

and

rewind

roller.

4.

ADJUSTMENT

OF

INTERMEDIATE

WHEEL

The

intermediate

wheel

is

located

between

the

rewind

idler

wheel

and

the

rubber

ring

which

is

used

on

the

upper

part

of

the

supply

reel

shaft

assembly.

Wher

the

unit

is

set

in

rewind

mode,

it

will

contact

to

these

parts

simultaneously

delivering

torque

of

motor.

An

adequate

pressure

to

be

kept

is

50

grams.

Adjust

the

load

spring

of

the

intermediate

wheel

in

case

the

pressure

is

not

sufficient.

5.

ADJUSTMENT

OF

TAKE-UP

REEL

SHAFT

ASSEMBLY

A

felt

clutch

material

is

attached

to

the

bottom

side

of

the

reel

table

base

plate

so

that

recording

tape

will

not

be

siretched

during

fast

forwarding

operation

due

to

excessive

tension.

To

check

the

amount

of

friction

of

this

part,

place

onto

the

take-up

reel

table

a

5-inch

reel

with

recording

tape

wound

by

60

m/m

in

diameter,

and

gently

pull

the

end

of

tape

upward

using

a

spring

scale.

Adjust

the

conical

spring

so

that

the

amount

of

tension

at

this

part

will

be

kept

between

400

to

500

grams.

Another

felt

clutch

material

is

attached

to

the

take-up

drive

wheel.

Itis

used

to

provide

proper

slipping

opera-

tion

during

record

or

play

mode.

The

procedure

for

checking

friction

of

this

part

is

same

as

the

foregoing,

and

between

120

and

200

grams

of

friction

will

provide

the

bert

result.

Adjust

the

star-shaped

spring

immediate

below

the

take-up

drive

wheel.

When

the

unit

is

set

in

rewind

mode,

the

amount

of

friction

of

this

part

will

great:y

be

reduced

and

will

become

10

to

20

grams.

Check

to

see

if

this

is

satisfactory

and,

if

not,

readjust

the

star-shaped

spring

for

Brake,

and

spring

retairar

washes

accordingly.

(See

figure

11

(a)

at

left)

6.

ADJUSTMENT

OF

SUPPLY

REEL

SHAT

ASSEMBLY

A

felt

clutch

material

is

used

between

the

lower

side

‘of

the

reel

table

base

plate

and

the

rewind

rubber

ring

to

protect

recurding

tape

from

an

excessive

tension

while

rewinding

operation.

To

check

the

amount

of

friction.

of

this

part,

place

onto

the

supply

reel

table

a

5-inch

reel

with

recording

tape

wound

by

60m/m

in

diameter

and

gently

pull

the

end

of

tape

upward

using

a

spring

scale.

Adjust

the

conical

spring

so

that

the

amount

of

tension

be

kept

between

400

an

500

grams.

Another

felt

clutch

is

attached

to

the

rewind

drive

wheel

and

is

used

to

provide

proper

slipping

operation

during

record

or

play.

mode.

The

procedure

for

checking

friction

of

this

part

is

same

as

the

foregoing,

and

between

80

and

120

grams

of

friction

will

give

the

best

result.

‘When

the

unit

is

set

in

fast

forward

mode,

the

amount

of

friction

will

greatly

be

reduced

and

will

become

10

to

20

grams.

Check

to

see

if

this

is

proper

and,

if

not,

readjust

coil

spring

and

spring

retainer

washer

to

suit.

7,

ADJUSTMENT

OF

TAPE

HEAD

(See

figure

12

{b)

at

left)

A

vertical

azimuth

alignment

of

tape

head

is

the

only

adjustment

that

can

be

made

at

the

field

of

service.

To

align

tape

head,

play

8,000

cycles

recorced

on

an

Ampex

standard

alignment

tape.

Fotate

the

azimuth

alignment

screw

until

a

maximum

piayback

leve:

through

the

small

hole

which

is

positioned

on

the

shield

cover

of

the

tape

head

assembly.