Teac A-400 Manual de usuario

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GENERAL

INTRODUCTION

This

Service

Manual

is

compiled

to

assist

service

technicians

by

providing

procedures

and

corrective

measures

for

adjustment,

care

and

maintenance,

and

the

ordering

procedures

for

needed

parts.

lf

adjustments

or

repairs

are

too

complicated

and

are

difficult

for

you

to

accomplish,

or

if

you

have

any

technical

questions,

please

contact

the

nearest

TEAC

Factory.

Service

Department

or

write

:

directly

to

a

TEAC

office,

the

addresses

of

which

are

written

on

the

back

cover.

NOTE

When

ordering

replacement

parts,

please

refer

to

the

PARTS

*

“Dolby”

and

the

Double

D

symbol

“OQ”

are

trademarks

of

Dolby

Laboratories

Inc.

The

Noise

reduction

circuit

is

made

under

license

from

Dolby

Labo-

ratories

Inc.

LIST

which

is

printed

separately

from

this

manual.

CONTENTS

1.

Specifications

&

Service

Data

............2

0.000:

3

4.

Electrical

Checks

and

Adjustments

.........+5--55

13

2.

Partial

Dis-assembly

of

Main

Parts

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

4

General

Notice

........

0.000

ee

BB

Test

Equipment

Required...

..----+++

13

2-1.

Cabinet

Removal

.............-204

4

2-2.

Front

Panel

Removal

...........0e08

4

4-1

Monitor

Performance

.......-+++000-

14

2-3.

Cassette

Holder

Removal

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

5

:

4-1-1.

Specified

Input

Level

Setting

.......+---

14

2-4,

Tape

Transport

Chassis

Removal

.........

5

4-1-2.

.

Minimum

Input

Level

Checks

.....----->

14

2-5.

Head

Replacement

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

Poeee

4-1-3.

Level

Meter

Calibration

.....0--25

eee

14

2-5A.

Record/Playback

Head...

........000-

6

4-1-4.

Peak

Level

Indicator

Setting

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

15

2-5B.

EraseHead

.......0.00

cc

cc

eaeees

6

4-1-5.

Headphone

Output

Level

Checks

.....-->

.15

2-6.

Pinch

Roller

Replacement

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

6

4-2.

Playback

Performance

.....----+

0-0

es

15

2-7.

Reel

Table

Replacement

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

7

4-2-1.

Record/Playback

Head

Azimuth

2-7A,

Take-up

Reel

Table...

..........-04-

7

SMIUSIGIG

9:02.

2-g

0

ah

eh

series

sep

ens

15

278.

Supply

Reel

Table

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

j

4-2-2.

Specified

Output

Level

Setting

...---

es

16

2-8.

Motor

Replacement..........-...00.

7

4-2-3.

Level

Meter

Indication

Checks...

+--+

+s

16

2-9.

Flywheel/Capstan

Belt

Replacement

.......

8

oe

Playback

Frequency

Response

Checks

.....

ss

2-10.

Fast

Wind

Idler

Replacement

...........

8

SScests

©

SHGNGL

A

TEDIRE

A

BG

CRERIS

sana

elete

SACS

S

4-3,

Record

Performance:

.......-+-++055

17

Parts

Location

.........

0.0000

eee

4

4-3-1.

Bias

Trap

Adjustments

.......--+-ee0005

17

4-3-2.

Bias

Adjustments

for

‘1’

Position

3.

Mechanical

Checks

and

Adjustments

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

3

(CrO.

Tape)...

6...

ee

ee

ee

eee

V7

4-3-3.

Bias

Adjustments

for

2”

Position

Test

Equipment

Required

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

9

(Regular

Tape)

.........--

stg

A

aden

ake

17

4-3-4.

Record

Level

Setting

.....--

2+

-

ee

eee

18

3-1.

Pinch

Roller

Pressure

...........-44-

9

4-3-5,

Distortion

Checks

.......

2-020

eee

18

3-2.

Take-up

Torque

Measurement...........

10.

4-3-6.

Overall

Frequency

Response

.-----++:->

18

3-3.

Fast

Forward

Torque

Measurement

.......

10

4-8-7.

Overall

Signal-to-Noise

Ratio...

.--.

eee

19

3-4.

Rewind

Torque

Measurement

...........

1

4-3-8.

Erase

Efficiency...

.....-0

002

ee

eee

19

Torque

Measurement

using

the

Cassette

4-3-9.

Channel

Separation

.

Sil

aces

eae

ees

20

Torque

Meter

.....2.......000.

a

4-3-10.

~

Crosstalk

between

Adjacent

Tracks

.-.----

20

4-3-11.

Dolby

*NR

System

Efficiency

Checks

......

20

“3-5.

Tape

Speed

Adjustment/Wow

and

Flutter

4-4,

Adjustment

&

Test

Point

Location

......-.-

21

Measurement...

20...

0...

cee

eee

eee

11

:

3-6.

Solenoid

Position

Adjustment.

..........

12

5.

Level

Diagram

.....-.0.0-c

eee

ee

eee

ees

22

3-7.

Muting

Switch

Position

Adjustment

.......

12

3-8.

Voltage

Selector

Setting

Procedure

.......

12

G:

Troubie-dhootttits.eoeeed

we

ee

ea ee

ee

23

3-9.

AC

Power

Line

Frequency

Adaptation.....

.

12

3-10.

Lubrication

2.2.0

...0........20005

12

1.

SPECIFICATIONS

Track

System

Type

of

Tape

Tape

Speed

Inputs

(impedance

and

level)

Outputs

(impedance

and

level)

Equalization

Head

Configuration

SPECIFICATIONS

&

SERVICE

DATA

1/4-track,

2-channel

stereo

Cassette

tape,

C-60

and

C-90

(Philips

type)

4.8

cm/s

(1-7/8

ips)

;

Microphones:

Min.

input

level:

-67

dB

+3

dB

(10

Kohms

or

more)

Line:

Specified

input

level:

—9

dB

(50

Kohms

or

more)

Min.

input

level:

-19

dB

+3

dB

DIN

*

:

Min.

input

level:

-35

dB

+3

dB

Line

out:

Max.

output

level:

+8 dB

+2

dB

(50

Kohms)

Specified

output

level:

+3 dB

Headphones:

Specified

output

level:

—21

dB

+

2dB

(8

ohms)

EQ

1:

3180

us

+

70

us

(for

CrO,

tape)

EQ

2:

3180

us

+

120

us

(for

regular

Hi-Fi

tape)

1/2-track,

1-channel

Erase

Head

Motor

Bias

Frequency

Operating

Position

Power

Requirements

Power

Consumption

Dimensions

Weight

*

Pursuant

to

DIN

Standards

SERVICE

DATA

Mechanical

Tape

Speed

Deviation

Wow

and

Flutter

Pinch

Roller

Pressure

Reel

Torque

Fast

Winding

Time

End-stop

Activate.

Time

Electrical

Frequency

Response

Signal

to

Noise

Ratio

Erase

Efficiency

Channel

Separation

Crosstalk

between

Adjacent

Tracks

Total

Harmonic

Distortion

4+/4-track;-2-channet

Record/Play

back

Head

DC

Servo

Motor

with

F.G.

voltage

control

100

kHz

Horizontal

100/117/220/240

V

AC,

50/60

Hz

(General

Export

Models)

117

V

AC

60

Hz

{USA/Canada

Models)

220

V

AC

50

Hz

(Europe

-Models)

11W

440

(W)

x

155

(H)

x

285

(D)

mm

[17-3/8"

(W)

x

6-1/8”

(H)

x

11-1/4"

(D)}

6.0

kg

(13-1/4

ibs)

net,

approx.

3,000

Hz

+45

Hz

|

Playback:

0.1%

(WRMS)

400

g

+

20g

(13.5

~

15.0

oz)

Take

Up:

45

~

70

g-cm

(0.6

~

1.0

oz-inch)

Fast

Forward:

80

g-cm

(1.1

oz-inch)

or

more

Rewind:

100

g-cm

(1.4

0z-inch)

or

more

90

seconds

for

C-60

3

seconds

+

2

sec.

Refer

to

frequency

response

limits

charts

on

pages

16,

18

and

19.

Playback

method:

47

dB

minimum

Record/Playback

method:

BIAS/EQ

1:

45

dB

minimum

BIAS/EQ

2:

44

d8

minimum

With

Dolby

Noise

Reduction

used

for

recording

and

playback,

S/N

ratio

is

improved

by

5

dB

at

1

kHz

and

10

dB

at

frequencies

over

5

kHz.

65

dB

minimum

:

30

dB

minimum

(at

1

kHz)

40

dB

minimum

(at

125

Hz)

BIAS/EO

1:

3.0%

(maximum)

BIAS/EQ.

2:

2.5%

(maximum)

NOTE:

©

All

the

items

were

determined

using

the

Regular

type

of

Hi-Fi

tape

except

as

noted.

e

improvements

may

result

in

Specifications

and

Service

Data

changes.

©

Value

of

“dB”

in

the

Data

refer

to

0

dB

=

0.775V,

except

where

specified.

if

a

Test

Set

or

VTVM

calibrated

to

0

dB

=

1V

is

to

be

used,

appropriate

compensation

should

be

made.

2.

PARTIAL

DIS-ASSEMBLY

OF

MAIN

PARTS

2-1.

CABINET

REMOVAL

2-2.

FRONT

PANEL

REMOVAL

Remove

the

Main

Chassis

from

the

Cabinet.

(See

Section

2-1)

Remove

the

4

Control

knobs

from

the

Front

Panel.

Remove

the

6

screws.

Remove

the

Front

Panel

from

the

Main

Chassis.

1.

Lay

the

deck

on

its

top

surface

as

illustrated

in

Fig.

1.

2.

Remove

the

7

screws

from

the

bottom.

3.

Remove

the

Main

Chassis

from

the

Cabinet.

Pe

NS

af

7-P

M3xl2

7-W

3.216%

1.6t

Fig.

1

Cabinet

Removal

Fig.

2

Front

Panel

Removal

NOTE:

For

assembling

hardware

shape

identification,

see

ASSEMBLING

HARDWARE

CODING

LIST

on

the

Parts

List.

PARTS

LOCATION

POWER

TRANSFORMER

POWER

SUPPLY

PC

BD.

_

REC/PB

AMPL.

PC.

BD.

FUSE

DC-

SERVO

AMPL.

PC

BD.

MOTOR

FLYWHEEL

SOLENOID

LEVEL

METER

Fig.

3

Parts

Location

2-3.

CASSETTE

HOLDER

REMOVAL

1.

Remove

the

Cabinet

and

the

Front

Panel.

(See

Section

2-1, 2-2)

2.

Loosen

the

2

screws

(1)

on

the

Bracket

A

(2)

and

the

2

screws

(3)

on

the

Brack-

et

B

®.

At

this

time,

the

work

is

made

easier

by

expanding

the

Springs

(5),

@)

in

the

direction

of

the

arrows.

3.

Remove

the

Cassette

Holder

oO)

from

the

Tape

Transport

Chassis.

2-4.

TAPE

TRANSPORT

CHASSIS

REMOVAL

1.

Remove

the

Cabinet

and

the

Front

Panel.

(See

Section

2-1,

2-2)

2.

Remove

the

4

screws

(1)-

(4)

.

3.

Extract

the

Insulator

Plate

A

(5)

from

~

the

Main

Chassis

(6)

.

4.

Remove

the

Reinforcing

Angle

(7)

by

taking

off

the

2

screws

and

loosing

the

screw

(9)

.

5.

Retighten

temporarily

the

screw

g)

‘

6.

Remove

the

Transport

Chassis

(0)

from

the

Main

Chassis

(6)

:

@

NN

ne

®)

5

2

CASSETTE

HOLDER

f

U

144

Fig.

4

Cassette

Holder

Removal

TAPE

TRANSPORT

°

CHASSIS

Cate

:

©)

7

SSD

mm

:

SA

M2.6x4

wy

®

BSA

M2.6x4

Fig.

5

Tape

Transport

Chassis

Removal

NOTE:

For

assembling

hardware

shape

identification,

see

ASSEMBLING

HARDWARE

CODING

LIST

on

the

Parts

List.

5

2-5.

HEAD

REPLACEMENT

2-5A.

Record/Playback

Head

1

Remove

the

Cabinet

and

the

Front

Panel.

(See

Section

2-1,

2-2}

Open

the

Cassette

Holder

door

to

the

45

degree

position

by

pushing

the

EJECT

Lever

to

the

right,

and

to

the

full

85

degree

position

by

pushing

the

door

to

the

left.

o.

the

Head

Protector

Ga)

by

taking

off

the

2

screws

Unsolder

the

wires

from

the

head

terminal

pins

@).

Remove

the

Head

@

by

taking

off

the

nut

6)

and

the

screw

6.

as.

PINCH

ROLLER

shown

in

Fig.

7.

2-5B.

Erase

Head

1,

oP

oN

2-6.

Repeat

steps

1,

2

in

2-5A

above.

(Record/Playback

Head)

Place

the

right

Rotary

Lever

in

the

PLAY

mode.

Unsalder

the

wires

from,

the

head

terminal

pins

@.

Remove

the

Head

(8)

by

taking

off

the

2

screws

@).

Re-solder

each

head

wire

to

the

newly

replaced

head

as

shown

in

Fig.

7.

NOTE

.

After

replacing

the

head

and

adjusting

its

azimuth

(See

Section

4-2-1),

secure

the

screws

and

the

nut

with

a

drop

of

locking

paint.

.

Connecting

the

wires

to

the

head

terminal

pins

should

be

done

quickly

to

prevent

breaking

of

internal

wires

of

the

head

due

to

overheating.

PINCH

ROLLER

REPLACEMENT

Remove

the

Cabinet

and

the

Front

Panel.

(See

Section

2-1,

2-2)

Qpen

the

Cassette

Holder

door

to

the

45

degree

pasition

by

pushing

the

EJECT

Lever

to

the

right,

and

to

the

full

85

degree

position

by

pushing

the

door

to

the

left.

Remove

the

Spring

from

the

Pinch

Roller

(1)

with

the

other

end

of

this

spring

remaining

attached

to

the

Head

Base

Plate

(2).

Remove

the

E-ring

@®

slowly

fram

the

pivot

pin

4).

Remove

the

Pinch

Roller

Ass’y

D

from

the

pivot

pin

2

At

this

time,

the

work

is

made

easier

by

pushing

the

EJECT

Lever

to

the

right.

:

Retain

the

Spring

(5)

and

remember

to

re-install

it

when

replacing

the

Pinch

Rolfer.

NOTE

Make

sure

that

the

arm

fits

properly

into

the

guide

(7)

in

the

Pinch

Roller

Ass’y

as

shown

in

Fig.

6.

BSA

M2x4

y

Wes

Oe

ey

we

NS

&

oe

2-BSA

M2x4

9

ERAS

2-PSA

M2.6x%4

Fig.

6

Heads/Pinch

Roller

Replacement

ERASE

HEAD

REC/PLAY

HEAD

T-417

Fig.

7

Head

Wiring

Diagram

6

NOTE:

For

assembling

hardware

shape

identification,

see

ASSEMBLING

HARDWARE

CODING

LIST

on

the

Parts

List.

2-7.

REEL

TABLE

REPLACEMENT

2-7A.

Take-up

Reel

Table

1.

2-2)

2.

Open

the

Cassette

Holder

door

to

the

45

degree

position

by

pushing

the

EJECT

Lever

to

‘the

right,

and

the

full

85

degree

position

by

pushing

the

door

to

the

left.

3.

Remove

the

Cassette

Guide

Plate

@)

from

the

Tape

2-PSA

Transport

Chassis

by

taking

off

the

4

screws

@):

eae

4,

Remove

the

Index

Counter

Belt

3)

from

the

groove

of

the

Take-up

Reel

Table(4)and

the

Index

Counter

Pulley.

5.

Remove

the

Flywheel

Ass’y

(See

2-9).

6.

Remove

the

Cassette

Holder

Stopper

®)

and

the

Reel

Table

Remove

the

Cabinet

and

the

Front

Panel.

(See

Section

2-1,

@

TAKE-UP

REEL

TABLE

@

simultaneously

by

taking

off

the

2

screws

6).

_-

2-7B.

Supply

Reel

Table

1.

2.

2-8.

Repeat

steps

1

to

3

in

2-7A

(Take-up

Reel

Table).

Remove

the

Cassette

Holder

Stopper

®

and

the

Supply

Reel

Table

at

the

same

time

by

taking

off

the

2

screws

MOTOR

REPLACEMENT

After

removing

the

Tape

Transport

Chassis

from

the

Main

Chassis,

do

the

following

procedures

(See

Section

2-1,

2-2,

2-4).

Remove

the

Capstan

Belt

(1)

from

the

Motor

Pulley

@.

Remove

the

PC

Board

(part

of

the

Motor

Assy)

@

from

the

Main

Chassis.

,

Bend

open

the

Wire

Clamp

®@

to

loosen

the

wires.

Unsolder

the

2

wires

(5)

(connected

from

the

Power

Supply

PC

Board)

to

the

PC

Board(3).

Remove

the

screw

(6)

attaching

the

Cassette

Guide

B

®,

and

loosen

the

screw

43)

and

turn

the

Guide

slightly

in

the

direction

of

the

arrow.

(for

access

to

the

Motor)

Remove

the

Motor

Assy

(incl.

the

Motor

Mount.

Plate

@)

from

the

Transport

Chassis

by

taking

off

the

3

nuts

(0).

Remove

the

Motor

Assy

a)

from

the

Motor

Mount.

Plate

@)

by

taking

off

the

3

screws

qd.

NOTE

Since

the

entire

Motor

Assy

includes

the

DC-servo

Ampl.

PC

Board

(provided

for

motor

speed

control),

always

replace

the

Motor

together

with

its

PC

Board.

Fig.

8

Reel

Table

Replacement

o)

ND

I.

\

y

7

Ne

y

j

<9

|

{

Al

|

|

B)WHT/ALK,

4

™

ee

NOTE:

For

assembling

hardware

shape

identification,

see

ASSEMBLING

HARDWARE

CODING

LIST

on

the

Parts

List.

2-9.

FLYWHEEL/CAPSTAN

BELT

REPLACEMENT

1.

After

removing

the

Tape

Transport

Chassis

from

the

Main

Q ®

Chassis,

perform

the

following

process.

(See

Section

2-1,

©

2-2,

2-4)

FLY

WHEEL.

2.

Remove

the

Flywheel

Bearing

Plate

a)

from

the

mounting

studs

(2)

by

taking

off

the

2

screws

(3).

3.

Retain

the

Spacer

@)

and

remember

to

re-install

it

when

replacing

the

Flywheel

Assy.

4.

Remove

the

Capstan

Belt

®

from

the

Flywheel

Assy

6)

and

the

Motor

Pulley

6).

5.

Remove

the

Oil

Retaining

Washer

@®

from

the

shaft

of

the

Flywheel.

:

:

@)

CAPSTAN

BELT

PSA

M2.6x8

i>

6.

Carefully

Tift

out

the

Flywheel

G5)

from

the

Capstan

Housing

(8).

—

Viewed

from

Rear

of

Transport

All

driving

surfaces

NOTE

aces

Siar

moana

After

reinstalling

the

Flywheel,

always

do

the

following.

1.

Clean

all

driving

surfaces

of

the

Flywheel

with

TEAC

Fig.

10

Flywheel/Capstan

Belt

Replacement

TZ-261A

Head

Cleaner

or

with

pure

alcohol

as

shown

in

“A”

in-

Fig.

10.

2.

Clean

the

Capstan

Belt

with

TEAC

TZ-261B

Rubber

Cleaner

As

OM

494-9

or

with

pure

alcohol.

\

Pe

ME

TAPE

RECORDER

3.

Apply

a

drop

of

a

light

machine

oil

with

an

oil

applicator

to

the

shaft

of

the

Flywheel

and

spread

oil

evenly

over

the

shaft

with

a

flannel

cloth.

After

installing

the

Flywheel

be

sure

to

clean

the

tape

moving

portion

of

shaft

with

TZ-261A

Head

Cleaner.

2-10.

FAST

WIND

IDLER

ASS’Y

REPLACEMENT

1.

First

perform

the

steps

fisted

below.

Cabinet

Removal

(Section

2-1)

Front

Panel

Removal

(Section

2-2)

Tape

Transport

Chassis

Removal

(Section

2-4)

Flywheel/Capstan

Belt

Removal

(Section

2-9)

.

Take-up

Reel

Table

Removal

(Section

2-7A)

2.

Remove

the

Spring

@

from

the

Fast

Wind

Idler

Assy

@

and

the

Fast

Wind

Plate

G3).

(Note

that

the

position

of

the

FAST

WIND

Spring

a

and

the

arm

of

the

Fast

Wind

Idler

Ass’y.

on

Pree)

which

the

Spring

is

mounted.

Position

the

Spring

and

%

pape

the

arm

correctly

when

replacing

or

re-installing

the

Fast

Wind

Idler

Ass’y.

)

3.

Remove

the

E-ring(@)from

the

pivot

pin(S).

4.

Lift

out

the

Fast

Wind

Idler

Assy

Q)

from

the

pivot

pin

5.

&.

re-assembling

the

Idler

Assy,

turn

the

left

Rotary

Lever

to

the

FF

position

to

simplify

remounting.

:

—

Viewed

from

Rear

of

Transport

Chassis

—

:

Fig.

12

Fast

Wind

idler

Replacement

NOTE:

For

assembling

hardware

shape

identification,

see

ASSEMBLING

HARDWARE

CODING

LIST

on

the

Parts

List.

3.

MECHANICAL

CHECKS

AND

ADJUSTMENTS

TEST

EQUIPMENT

REQUIRED

1.

Spring

scale:

For

take-up

torque

check:

0

~

70g

(0

~

2.5

02)

For

fast

forward

and

rewind torque

checks:

0

~

200g

(0

~

7.0

oz)

2.

String:

Length:

about

50

cm

(20”)

3.

Cassette

Reel

Adapter:

Diameter:

22

mm

*

The

tools

above

(1

~3)

are

constructed

as

shown

in

Fig.

13.

4.

Cassette

Torque

Meter:

For

take-up

torque

check:

0

~

100

g-cm

For

fast

forward

and

rewind

torque

checks:

0

~

160

g-cm

*

Use

of

the

Cassette

Torque

Meter

instead

of

the

spring

scale,

if

you

have

one,

is

recommended

for

easier

measuring,

(See

Fig.

19

on

Page

11)

Fig.

13

Spring

Scale

and

Cassette Reel

Adapter

5,

Spring

scale

(for

the

Pinch

Roller

pressure

check):

O~1kg

(2.2

Ibs)

6.

TEAC

MTT-111

test

tape:

For

tape

speed

and

wow/flutter

checks

7.

Wow/Flutter

meter:

MEGURO

DENPA

SOKKIK.K.

Model

MK-668A,

D

&

R

Co.,

FL-

ae

or

equivalent:

8.

Frequency

counter:

Digital

type,

capable

of

10

Hz

to

100

kHz

indica-

tion.

NOTE

All

the

mechanical

checks

and

adjustments

should

be

done

with

the

Cabinet

and

the

Front

Panel

removed.

(See

Section-2-1,

2-2)

PINCH

ROLLER

PRESSURE

The

Pinch

Roller

pressure

should

be:

400

g

+ 20

g-

(13.

5

as

15.0

oz)

Open

the

Cassette

Holder

door

to

the

left.

Switch

the

POWER

switch

to

the

ON

position.

Place

the

deck

in

the

PLAY

mode

with

no

tape

loaded.

Attach

the

spring

scale

to

the

Pinch

Roller

shaft

as

shown

in

Fig.

14.

Gently

draw-the

scale

away

(in

the

direction

of

the

arrow)

until

the

Capstan

shaft

and

the

Pinch

Roller

are

completely

separated.

Gradually

release

the

tension

on

the

scale

until

the

Pinch

Fe

Oe

Roller

just

begins

to

rotate.

The

scale

should

then

be

reading

©

—-

Bend

here

to

adjust

1-407

approximately

400

g

+

20

g

(13.5

~

15.0

o2).

:

If

the

reading

is

out

of

specified

range,

adjust

the

tension

of

Fig.

14

Pinch

Rotler

Pressure

Measurement

the

Pressure

Spring

by

bending

the

tab

of

the

Pinch

Roller

Assy

slightly.

3-2.

TAKE-UP

TORQUE

MEASUREMENT

The

take-up

torque

should

be:

45

~

70

g-cm

(0.6

~

1.0

oz*inch)

Open

the

Cassette

Holder

door

fully

to

the

left.

Remove

the

Cassette

Guide

Plate.

(See

2-7A

in

Section

2-7)

Switch

the

POWER

switch

to

the

ON

position.

Set

the

Cassette

Reel

Adapter

(22

mm

Dia.),

connected

to

the

spring

scale

(Q

~

70

g,

or

0

~

2.5

oz)

by

the

string,

on

the

Take-up

Reel

Table

as

shown

in

Fig.

15.

Place

the

deck

in

the

PLAY

mode.

6.

Allow

the

rotation

of

the

Reel

Table

to

draw

the

scale

Pons

n

Take-up

Reel

Table

pointer

toward

the

Adapter

with

the

spring

scale

moving

in

the

same

direction

at

nearly

the

same

speed

as

the

tape

would

be

moved,

and

obtain

the

scale

reading.

Make

reading

only

when

the

pointer

becomes

stable.

7.

The

scale

should

indicate

41

~

64

g

(1.4

~

2.2

02).

This

corresponds

to

a

torque

of

45

~

70

g:cm

(0.6

~

1.0

oz‘inch).

For

the

torque

calculation,

refer

to

Fig.

16.

8.

If

the

reading

is

out

of

specified

range,

clean

the

driving

surfaces

of

the

Reel

Table

Assy,

the

Play

Idler

and

the

Flywheel

with

the

TEAC

TZ-261B

Rubber

Cleaner

or

with

pure

alcohol

(Fig.

17)

;

9.

If

the

above

cleaning

is

ineffective

for

torque

correction,

replace

the

Reel

Table

Assy.

(See

Section

2-7)

3-3.

FAST

FORWARD

TORQUE

MEASUREMENT

The

fast

forward

torque

should

be:

80

g-cm

(1.1

oz-inch)

or

more

1.

Repeat

step

1

to

3

in

3-2

above.

2.

Set

the

Cassette

Reel

Adapter

(22

mm

Dia.),

connected

to

the

spring

scale

(0

~

200

g,

or

0

~

7.0

oz)

by

the

string,

on

the

Take-up

Reel

Table

as

shown

in

Fig.

15.

3.

Place

the

deck

in

the

FF

mode.

4.

Permit

the

revolution

of

the

Reel

Table

to

pull

the

scale

pointer

toward

the

Adapter,

and

obtain

the

scale

reading.

Do

not

read

until

the

pointer

becomes

stable.

5.

The

scale

should

indicate

73

g

(2.6

oz)

or

more.

This

corresponds

to

a

torque

of

80

g-cm

(1.1

oz-inch)

or

more.

.

6.

If

the

indication

is

out

of

specified

range,

clean

the

driving

surfaces

of

the

Reel

Table

Assy,

the

Fast

Wind

Idler

Assy

and

the

Flywheel

with

the

TEAC

TZ-261B

Rubber

Cleaner

or

with

pure

alcohol.

(Fig.

17)

7.

|f

the

above

cleaning

is

ineffective

for

the

torque

correction,

replace

the

Fast

Wind

Idler

Assy.

(See

Section

2-10)

10

-

/Fast

Wind

Idier

Assy

Supply

Reel

Table

{

7-406

Fig.

15

Take-up/Fast

Forward

Torque

Measurement

Cassette

Reel

Adapter

T-409

T

=

Fxr

For

example:

T:

torque

(g-cm)

if

F=41g

F:

force

(g)

r:

radius

(cm)

T=Fxr

=41x

1.1

=

45

(g-cm)

;

Consequently

the

torque

is

45

g-cm.

Fig.

16

Torque

Calculation

Method

Flywheel

Play

Idler

Take-up

Reel

Table

Capstan

Belt

~

xe

‘Our

Ne

a

mess

Motor

Supply

Reel

Table

7-386

Fig.

17

Tape

Drive

System