Teac A-3300SR Bedienungsanleitung

Andere Handbücher für A-3300SR

1

Dieses Handbuch passt für folgende Modelle

1

Inhaltsverzeichnis

Andere Teac Kassettendeck Handbücher

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Teac

Teac A-3440 Bedienungsanleitung

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Teac A-3340S Bedienungsanleitung

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Teac X-1000M Bedienungsanleitung

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Teac A-6010GSL Bedienungsanleitung

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Teac A-3300 Bedienungsanleitung

Teac

Teac A-6600 Bedienungsanleitung

Teac

Teac A-2340 Bedienungsanleitung

Teac

Teac A-2300SD Bedienungsanleitung

Teac

Teac X-3 Bedienungsanleitung

Teac

Teac X-2000 Bedienungsanleitung

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Teac Tascam 3030 Bedienungsanleitung

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Teac A-4300SX Bedienungsanleitung

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Teac A-3300SR Bedienungsanleitung

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Teac X-7RMKII Bedienungsanleitung

Teac

Teac X-300R Bedienungsanleitung

Teac

Teac A-6100MKII Bedienungsanleitung

Teac

Teac X-1000R Bedienungsanleitung

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Teac A-6100 Bedienungsanleitung

Teac

Teac X-300R Bedienungsanleitung

Beliebte Kassettendeck Handbücher anderer Marken

Hitachi

Hitachi D-980MU Bedienungsanleitung

Hitachi

Hitachi D-900BS Bedienungsanleitung

Kyocera

Kyocera D-611 Bedienungsanleitung

Kenwood

Kenwood KX-W595 Bedienungsanleitung

Akai

Akai GX-630D Bedienungsanleitung

Sony

Sony DTC-A8 Bedienungsanleitung

TANDBERG

TANDBERG 11 Bedienungsanleitung

Sony

Sony DTC-670 Bedienungsanleitung

Pioneer

Pioneer H-R99 KCU Bedienungsanleitung

Tascam

Tascam 34B Fehlerbehebungshandbuch

Akai

Akai GX-230 Bedienungsanleitung

Akai

Akai GX-215D Bedienungsanleitung

Technics

Technics SV-DA10 Bedienungsanleitung

Akai

Akai GX-370D Bedienungsanleitung

Advent

Advent 201 Bedienungsanleitung

Pioneer

Pioneer RT-1011L Bedienungsanleitung

Kenwood

Kenwood KX-79CW Bedienungsanleitung

Revox

Revox A77 Bedienungsanleitung

A-3300SR

A-2300SR

Stereo

Tape

Deck

TEAC

CORPORATION

51032220

1.

GENERAL

DESCRIPTION

The

TEAC

A-3300/A-2300

series

tape

decks

have

earned

an

enviable

reputation

for

quality

since

their

first

introduction

years

ago.

Over

the

years

various

design

improvements

have

been

incorpo-

rated

in

the

basic

model

to

keep

these

decks

abreast

of

the

advances

in

tape

technology

and

to

fulfill

the

needs

of

our

growing

range

of

knowlegeable

customers.

The

A-3300S/A-2300S

and

A-3300SX/A-2300SX

followed,

building

on

the

tested

and

proven

reliability

of

the

original

models

and

offering

ever

increasing

versatility

and

user

satisfaction.

Now

TEAC

introduces

the

new

A-3300SR/A-2300SR

which

have

the

added

capability

of

reverse

playback

together

with

several

sophisticated

circuit

improvements

to

keep

these

new

models

at

State-of-the-art

reliability.

The

basic

design

of

the

A-3300SR/A-23008R

is

highly

similar

to

that

of

the

A-3300SX/A-2300SX,

therefore,

information

in

this

manual

may

be

applied

to

the

A-3300SX/A-2300SX

also.

A-3300SR

A-2300SR

—

TABLE

OF

CONTENTS

—

1.

GENERAL

DESCRIPTION

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

3

2.

SPECIFICATIONS

AND

SERVICE

DATA

......

4

3.

TOOLS

FOR

TESTING

AND

MAINTENANCE

...

6

4.

PARTIAL

DIS-ASSEMBLY

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

7

5.

TAPE

TRANSPORT

PARTS

LOCATION

.......

9

6.

HEAD

REPLACEMENT

AND

ALIGNMENT

.....

10

—

MECHANICAL

—

7.

MEASUREMENT

AND

ADJUSTMENT

........

11

—

MECHANICAL

—

8.

MEASUREMENT

AND

ADJUSTMENT

........

14

—

ELECTRICAL

—

9.

SERVICING

AND

MAINTENANCE

..........

21

10.

SIMPLIFIED

SCHEMATIC

WITH

LEVEL

INDICATIONS

........-.

02200

e

ee

reese

22

2.

SPECIFICATIONS

AND

SERVICE

DATA

2-1

A-3300SR

Track

System

Heads

Reel

Size

Tape

Speed

Motors

Inputs

(Level

and

Impedance)

Outputs

(Level

and

Load

Impedance).

Playback

Equalization

Bias

Frequency

Power

Requirement

Power

Consumption

Weight

Dimensions

(WHD)

1/4

track

2

channel

stereophonic

1/4

track

1

channel

monophonic

Three;

Erase,

Record

and

Forward/Reverse

Playback

10-1/2"

and

7”

7-1/2

ips

and

3-3/4

ips

1

Dual-Speed

Hysteresis

Synchronous

Capstan

Motor

2

Eddy

Current

Induction

Reel

Motors

MIC:

Specified;

—60

dB

(0.774

mV)/10k

ohms

Minimum;

—70

dB

(0.244

mV)

LINE:

Specified;

—8

dB

(308

mV)/50k

ohms

Minimum;

—18

dB

(97

mV)

HEADPHONE:

—24

dB

(49

mV)/8

ohms

LINE:

Specified;

—8 dB

(308

mV)/10k

ohms

Maximum;

—2

dB

(615

mV)

7-1/2

ips:

NAB

3180

ys,

50

us

3-3/4

ips:

NAB

3180

us,

90

us

100k

Hz

(+5k

Hz,

push-pull

oscillator)

100,

117,

220,

240

V

AC

50/60

Hz

(General

Export

Model)

117

V

AC

60

Hz

(U.S.A.

and

Canada

Model)

143

W

21

kg

(46

Ibs)

net

440

x

440

x

210

mm

(17-5/16"

x

17-5/16”

x

8-1/4")

2-2

SERVICE

DATA

—MECHANICAL—

Tape

Speed

Deviation

and

Drift

Wow

and

Flutter

Pinch

Roller

Pressure

Reel

Torque

3,000

Hz

+30

Hz,

within

15

Hz

Playback:

Both

Direction,

0.18%

(RMS)

at

7-1/2

ips

0.20%

(RMS)

at

3-3/4

ips

Overall:

0.20%

(RMS)

at

7-1/2

ips

0.25%

(RMS)

at

3-3/4

ips

2.1

kg

(4.6

lbs)

|

DIRECTION

|

REEL

SIZE

TAKE-UP

VALUES

BACK

TENSION

VALUES

FWD

LARGE

790

to

870

g-cm

(11

to

12

oz-inch)

280

to

360

g-cm

(4

to

5

oz-inch)

SMALL

370

to

410

g-cm

(5

to

6

oz-inch)

175

to

215

g-cm

(2.4

to

3

oz-inch)

REV

LARGE

1000

to

1100

g-cm

(14

to

15

oz-inch)

|

320

to

400

g-cm

(4.5

to

5.6

oz-inch)

SMALL

500

to

550

g-cm

(7

to

8

oz-inch)

185

to

225

g-cm

(2.6

to

3

oz-inch)

Brake

Torque

1,600

to

2,000

g-cm

(22

to

28

oz-inch)

F.F/REW

Time

Refer

to

Section

2-5

for

Electrical

Service

Data

applicable

to

both

models.

140

seconds

for

1,800

foot

tape

NOTE:

Asa

result

of

continuing

change

and

improvements

during

the

production

run,

minor

differences

may

be

found

between

early

and

later

machines.

Value

of

“dB”

in

this

manual

refer

to

0

dB

=

0.775

V.

2-3

A-2300SR

Track

System

Heads

Reel

Size

Tape

Speed

Motors

Inputs

(Level

and

Impedance)

Outputs

(Level

and

Load

Impedance)

Playback

Equalization

Bias

Frequency

Power

Requirement

Power

Consumption

Weight

Dimensions

(WHD)

1/4

track

2

channel

stereophonic

1/4

track

1

channel

monophonic

Three

;

Erase,

Record

and

Forward/Reverse

Playback

qe

7-1/2

ips

and

3-3/4

ips

1

Dual-Speed

Hysteresis

Synchronous

Capstan

motor

2

Eddy

Current

Induction

reel

motors

MIC:

Specified;

—60

dB

(0.774

mV)/10k

ohms

Minimum;

—70

dB

(0.244

mV)

LINE:

Specified;

—8

dB

(308

mV)/50k

ohms

Minimum;

—18

dB

(97

mV)

HEADPHONE:

—24

dB

(49

mV)/8

ohms

LINE:

Specified;

—8

dB

(308

mV)/10k

ohms

Maximum;

—2

dB

(615

mV)

7-1/2

ips:

NAB

3180

us,

50

us

3-3/4

ips:

NAB

3180

us,

90

ps

100k

Hz

(+5k

Hz,

push-pull

oscillator)

100,

117,

220,

240

V

AC

50/60

Hz

(General

Export

Model)

117

V

AC

60

Hz

(U.S.A,

and

Canada

Model)

120

W

19

kg

(42

Ibs)

net

440

x

392

x

210

mm

(17-5/16”

x

15-7/16”

x

8-1/4")

2-4

SERVICE

DATA

—MECHANICAL—

Tape

Speed

Deviation

and

Drift

Wow

and

Flutter

Pinch

Roller

Pressure

Reel

Torque

Brake

Torque

Fast

Forward/Rewind

Time

3,000

+30

Hz,

within

15

Hz

Playback:

0.18%

(RMS)

at

7-1/2

ips

0.20%

(RMS)

at

3-3/4

ips

Overall:

0.20%

(RMS)

at

7-1/2

ips

0.25%

(RMS)

at

3-3/4

ips

2.1

kg

(4.6

Ibs)

|

DIRECTION

|

TAKE-UP

VALUES

|

BACK

TENSION

VALUES

370

to

410

g-cm

175

to

215

g-cm

(5

to

5.6

oz-inch)

(2.4

to

3

oz-inch)

500

to

540

g-cm

185

to

225

g-cm

(7

to

8

oz-inch)

(2.6

to

3

oz-inch)

800

to

1,200

g-cm

(11

to

17

oz-inch)

140

seconds

for

1,800

foot

tape

FWD

REV

2-5

SERVICE

DATA

—ELECTRICAL—

(both

models)

Frequency

Response

Signal-to-noise

Ratio

Erase

Efficiency

Crosstalk

Rejection

Total

Harmonic

Distortion

Refer

to

Frequency

Response

Limits

chart

in

this

manual

Overall:

47

dB

or

higher

at

7-1/2

ips

45

dB

or

higher

at

3-3/4

ips

68

dB

or

more

at

1k

Hz

(Measured

with

input

10

dB

higher

than

the

specified

input

level)

40

dB

or

more,

adjacent

track

at

125

Hz

50

dB

or

more,

channel

to

channel

at

1k

Hz

Overall:

1.0%

or

less

at

1k

Hz

signal

at

O

VU

DIMENSIONS

A-3300SR

A-2300SR

|

367mm

3,

7

1496)

US

6668866

410mm

ve

wae

ave

use)

(440mm)

(210mm)

440mm

754g)

16’

(4omm?

3.

TOOLS

FOR

TESTING

AND

MAINTENANCE

A

minimum

of

the

following

tools

and

test

instruments

are

required

for

measuring

and

adjusting

to

obtain

optimum

performance.

Regular

maintenance

tools

will

be

adequate

for

those

not

listed

here.

If

any

test

instrument

listed

here

is

not

available,

a

close

equivalent

can

be

used.

WOW

AND

FLUTTER

METER........

Meguro

Denpa

Sokki

K.K.,

Model

MK-668C

or

D

&

R

Co.,

Model

FL-4B

AC

VTVM

8c

68

bg

ew

arene

hsena

a

geok

6

Hewlett-Packard

Co.,

Model

400E

(0.1

mV

—300V)

DIGITAL

FREQUENCY

COUNTER

....

Range;

10

Hz

—

100

kHz

BAND-PASS

FILTER

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

1

kHz

narrow

band-pass

type

OSCILLOSCOPE

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

General

Purpose

AF

OSCILLATOR

...........-.565

10

Hz

—

100

kHz

ATTENUATOR

............-00065

General

Purpose

DISTORTION

ANALYZER

..........

Basic

Freq.

400

Hz/1

kHz

TOOLS

Siyipeca

eh

&

sees

eset

s

Becianane

ters

aloe

Spring

scale;

O—4

kg

(O—8

Ibs)

O—1

kg

(0—2.2

lbs)

Hex

head

Allen

Wrench,

Plastic

alignment

tool,

Load

resistor

non-inductive

type

8

ohm/1

W

HEAD

DEMAGNETIZER

...........

TEAC

E-3

or

equivalent

TEAC

TEST

TAPE

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

YTT-1002

(3-3/4

ips),

YTT-1003

(7-1/2

ips)

for

Playback

Alignment

test,

YTT-8013

and

YTT-8023

for

Recording

test,

YTT-2002

(3-3/4

ips),

YTT-2003

(7-1/2

ips)

for

Tape

Speed

and

Wow/Flutter

test

TEAC

EMPTY

REEL

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

RE-702

(2.5"

dia.

hub),

RE-701

(4”

dia.

hub)

4.

PARTIAL

DIS-ASSEMBLY

4-1

REMOVING

WOODEN

SIDES

meal

pe

®

AND

REAR

PANEL

:

See

illustration

for

complete

dis-assembly

instructions.

Most

amplifier

checks

and

adjustments

can

be

made

from

the

bottom

with

the

(bottom)

panel

removed.

These

adjustments

should

be

performed

by

experienced

technicians,

and

then

only

when

going

through

the

com-

plete

test

and

check

procedures

on

the

unit

which

is

being

tested.

:

=

Fig.

4-2

Head

Ass’y

Removal

Ny

tg

iy

elit

My

ig

Mi

ti

4-3

REMOVAL

OF

CAPSTAN

MOTOR

1.

Remove

the

3

screws

(a)

holding

the

capstan

motor

Plate.

2.

Unsolder

the

6

wires

connecting

the

capstan

motor.

3.

Remove

the

4

screws

holding

the

capstan

motor

to

the

motor

plate.

Watch

for

the

Rubber

Cushions.

4.

Loosen

the

2

set

screws

(hex

head)

in

pulley

and

lift

off

io

pulley.

Loosen

2

set

screws

in

fan

and

remove

fan.

“eo

NOTE:

USA,

CANADA

versions

of

the

A-3300SR/

222

sl:

A-2300SR

have

a

different

pulley

than

that

shown

eo

222

|

%@

and

have

no

Frequency

Selector

switch.

See

page

|

Noiee2

13,

Section

VOLTAGE

AND

“FREQUENCY

rir

22g

|

CONVERSION.

Fy

Fig.

4-1

Removing

Wooden

Sides

and

Rear

and

Bottom

Panels

4-2

HEAD

ASSEMBLY

REMOVAL

To

change

the

head

assembly

as

a

unit,

.

Note

the

positions

of

the

wires

on

the

circuit

board.

.

Unsolder

the

wires.

.

Remove

the

2

mounting

screws,

replace

the

assembly.

.

Solder

the

wires

of

the

new

assembly

in

exactly

the

same

positions.

ae

Frquency

selector

SW

(EX

model

only)

BRWHN

NOTE:

See

page

10,

HEAD

REPLACEMENT

AND

ALIGN-

MENT

Section

for

more

detailed

explanation.

Fig.

4.3

Capstan

Motor

Removal

4-4

REMOVAL

OF

CAPSTAN

ASSEMBLY

A-3300SR

A-2300SR

1.

Unscrew

dust

cap

(front

panel).

2.

Remove

2

screws

from

rear

bracket.

Allow

bracket

to

drop

toward

floor

of

case.

.

Remove

capstan

belt.

.

Loosen

2

screws

in

flywheel.

Remove

flywheel.

.

Remove

3

screws

in

capstan

ass’y.

.

Gently

move

capstan

ass’y

up

and

down

until

it

slides

out

of

panel.

Nm

W

NOTE:

When

replacing

flywheel,

position

flywheel

on

capstan

ass’y

shaft

so

that

end

of

shaft

protrudes

slightly

from

rear

of

flywheel.

A

clearance

of

ap-

prox.

0.01”

must

be

maintained

between

the

end

of

the

capstan

shaft

and

the

rear

bracket.

Rear

Bracket

Flywheel

Fig.

4-5

Reel

Motors

Removal

ii

4-6

REMOVAL

OF

TENSION

ARMS

LEFT

AND

RIGHT

See

illustration

for

complete

dis-assembly

instructions.

IMPORTANT:

After

re-assembly

check

clearance

to

ascer-

tain

that

arm

moves

freely

and

is

not

binding.

Capstan

Ass’y

CAUTION:

Do

not

over-tighten

screws

holding

micro-

=

switches.

Dust

Cap

Insulating

spacer

and

micro-switches

are

easily

broken

by

€Xcess

pressure.

Fig.

4-4

Capstan

Ass‘y

Removal

4-5

REMOVAL

OF

REEL

MOTOR

mae

vo

1.

Disconnect

the

4

motor

wires

from

terminals

and

release

wire

harness

straps.

2.

Loosen

2

set

screws

(hex

head)

in

Brake

drum(A)

and

2

in

the

Reel

Turntable

assembly(F).

Lift

off

these

parts.

<>

Tnsulating

3.

Remove

4

screws

securing

the

Brake

Assembly(D)

to

the

motor.

Carefully

lift

off

the

Brake

Retainer(B).

Do

not

remove

wires

connected

to

the

brake

solenoid(C)

or

as

micro

switch.

2

|

4.

Remove

4

screws

securing

Reel

Motor(E)

to

chassis

83

&

through

the

front

panel.

=

Fig.

4-6

Tension

Arms

Removal

5.

TAPE

TRANSPORT

PARTS

LOCATION

REAR

VIEW

Control:

Relay

A-3300SR

P.C

Board

Fuse

P.C

Board

R3

R1

R2

nee

=

a

_

Neen.

a

*

Power

-

ar

a

if

-=s

zi

i]

Transformer

Right

’

I5¥F\"

i

m

=

Left

Reel

Motor

G

@

.

:

pt

4

Reel

Motor

Reel

C41

Motor

P.C

Board

Capstan

Motor

c40

Capstan

Freq.

Selector

SW

Flywheel

Power

Supply

P.C

Board

Head

Selector

P.C

Board

Voltage

Selector

Plug

(for

General

Export

Model)

A-2300SR

C42

Power

Transformer

:

Control

Relay

C4l

P.C

Board

Left

Reel

Motor

Right

R3

Reel

Motor

Capstan—.

Motor

—R?2

Reel

C40

Motor

i

P.C.

Board

Freq.Selector

SW

Capstan

Power

Supply

Belt

P.C

Board

Capstan

’

Head

Select

Flywheel

o

P.C

Board

Voltage

Selector

Plug

(for

General

Export

Model)

NOTE:

Refer

to

page

12

for

the

TORQUE

MEASUREMENT

procedure.

For

ordering

parts,

refer

to

the

exploded

view

in

the

PARTS

LIST.

An

accompa-

nying

listing

provides

the

correct

parts

numbers.

6.

HEAD

REPLACEMENT

AND

ALIGNMENT

—

MECHANICAL

—

6-1

HEAD

REPLACEMENT

AND

WIRING

To

replace

a

single

head

a

special

2

mm

nut

driver

is

re-

quired,

Remove

the

2

nuts

(A)

on

the

defective

head

through

the

access

hole

provided.

This

releases

the

head

from

the

mounting

plate.

Note

the

position

of

the

wires

on

the

circuit

board.

Connect

the

new

head

in

the

same

manner.

Replace

the

nuts

securing

the

new

head

to

the

plate.

Perform

head

alignment

before

operation.

as)

Se

ca-—

Nuts

(A)

Spacer

>

oa

‘O

|

Playback

_-/”

Head

only

Ele

|

—[s

Shield

Fig.

6-1

Head

Replacement

ss

PLAYBACK

HEAD

RECORD

HEAD

ERASE

HEAD

T

TARA

NAVA

>

fFfa®

Zou

Zz

ase?

55S

$

GB

L_ewo

etl

rev

«

Fig.

6-2

Head

Wiring

—Rear

View—

6-2

HEAD

ADJ.

SCREWS

AND

NUTS

-

®

Azimuth

adj.

screws

©

>

Height

and

Tilt

adj.

screws

©

Tangency

adj.

Nuts

T-H135

Fig.

6-3

Head

Adjustment

Screns

end

Nuts

6-3

VISUAL

HEAD

ALIGNMENT

Since

head

alignment

critically

affects

the

frequency

re-

sponse

on

both

playback

and

recording,

the

head

alignment

should

be

done

carefully.

The

head

can

be

adjusted

in

TILT,

TANGENCY,

HEIGHT

and

AZIMUTH.

For

head

alignment,

perform

the

following

coarse

adjust-

ments

first.

Then

fine

alignment

should

be

accomplished

electrically

while

playing

back

the

Test

Tape.

Coarse

Adjustment

;

Without

Tape

TIED

4.5

esses

ee

Bh

By

Height

and

Tilt

screws

This

alignment

is

performed

by

viewing

from

the

side

without

tape

threaded.

Check

that

the

head

surface

is

parallel

to

the

tape

guide

surface.

With

Tape

TANGENCY

.....

By

Head

mounting

Nuts

Loosen

the

head

mounting

nuts.

Adjust

the

head

so

that

the

vertical

alignment

of

the

head

gap

is

perpendicular

to

the

surface

of

the

tape,

then

tighten

the

head

mounting

Nuts.

HEIGHT

........

By

Height

and

Tilt

screws

This

alignment

is

checked

visually

by

looking

at

the

position

of

the

head.

The

head

core

for

track-1

(inner

core)

should

be

even

with

the

inner

edge

of

the

tape.

AZIMUTH

......

By

Azimuth

adj.

Screw

Adjust

the

azimuth

adj.

screw

so

that

the

gap

of

the

head

is

perpendicular

to

the

tape

travel.

NOTE:

After

this

coarse

adjustment

is

made,

the

adj.

screws

and

the

Head

mounting

nuts

should

be

re-

aligned

according

to

electrical

head

algmment

paragraph

which

follows

in

this

Service

Manual.

7-4

MIS-ALIGNMENT

OF

THE

HEADS

HEIGHT

(view

from

front

of

head)

AZIMUTH

‘view

from

front

of

head?

Adjust

by

©

Nuts

Adjust

by

@

Screws

Fig.

6-4

Head

Mis-Alignment

—

Examples

—

Capstan

Shaft

7.

MEASUREMENT

AND

ADJUSTMENT

—

MECHANICAL

—

7-1

PINCH

ROLLER

PRESSURE

NOTE:

Pinch

roller

pressure

is

supplied

by

the

pinch

roller

spring

arm

and

it is

most

important

that

the

sole-

noid

plunger

be

fully

bottomed

before

taking

pres-

sure

measurement.

.

Load

tape

or

block

the

shut-off

arm

in

the

ON

position.

.

Attach

a

suitable

spring

scale

to

the

pirich

roller

shaft.

.

Place

the

unit

in

the

PLAY

mode

(>

),

and

holding

the

spring

scale

as

illustrated,

slowly

draw

it

away

from

the

pinch

roller.

.

Do

not

allow

the

string

to

rub

against

the

pinch

roller.

.

Note

the

reading

on

the

spring

scale

at

the

instant

the

pinch

roller

stops

rotating.

.

The

scale

should

indicate

2.0

to

2.2

kg

(4.4

to

5.0

lbs.)

.

If

adjustment

is

necessary,

loosen

the

3

screws

on

the

capstan

solenoid

and

position

the

solenoid

for

optimum

pressure.

.

Adjust

solenoid-limit

position

so

that

the

gap

between

capstan

shaft

and

pinch

roller

is

approx.

7mm

when

solenoid

is

not

actuated.

Also

make

sure

pinch

roller

shaft

does

not

contact

spring

arm

(B).

Limit

is

adjusted

by

loosening

the

mounting

screw

(A),

then

sliding

limit

until

proper

position

is

obtained.

Mounting

Screws

(A)

Capstan

Solenoid

Reposition

Solenoid

to

Obtain

Optimum

Pressure

Pinch

Roller

Spring

Scale

T-1134

Fig.

7-1

Pressure

Measurement

and

Adj.

Locations

7-2,

BRAKE

TORQUE

The

brake

torque

is

actuated

mechanically.

Pressure

is

set

by

the

variable

spring

force.

While

making

these

measure-

ments

and

adjustments,

be

careful

not

to

bend

the

brake

bands.

As

brake

torque

will

change

with

cleaning,

brake

drums

should

be

cleaned

only

when

absolutely

necessary.

If

cleaning

is

required,

use

TEAC

cleaner

TZ-261A.

After

cleaning,

operate

the

brakes

by

depressing

the

play

and

STOP

buttons

several

times

to

completely

dry

out

the

brakes

before

performing

the

following

procedure.

NOTE:

Brake

adjustments

are

made

with

NO

power

connected

to

the

equipment.

1.

Place

an

empty

large

hub

reel

on

the

left

reel

table,

and

fasten

one

end

of

a

30”

length

of

string

to

the

reel

anchor.

2.

Wind

several

turns

of

string

counterclockwise

around

the

hub

and

attach

a

suitable

spring

scale

to

the

free

end

of

the

string

and

pull

on

scale

until

reel

begins

to

turn.

3.

Take

a

reading

only

when

the

reel

is

in

steady

motion

since

the

force

required

to

overcome

static

friction

will

produce

a

false,

excessively

high

initial

reading.

4.

The

reading

(Calculated

value)

should

be

1800

g-cm

+200

g-cm

(22

to

28

oz-in).

1000

g-cm

+200

g-cm

(11

to

17

oz-inch)

for

A-2300

SR

5.

If

adjustment

is

required,

loosen

the

3

screws

shown

and

position

the

brake

for

optimum

torque.

6.

The

adjustment

of

the

right

brake

is

the

same,

with

the

exception

that

rotations

are

clockwise.

(wind

string

CLOCKWISE

around

reel

hub)

7.

See

note

at

the

top

of

page

12

for

explanation

of

torque

measurements.

Brake

Band

Space

Adi.

T-1133

Fig.

7-2

Torque

Measurement

and

Adjustment

LOcation

Brake

Torque

Adj.

Screws