Teac A-450 Manual de usuario

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GENERAL

INTRODUCTON

This

Service

Manual

is

provided

to

assist

service

technicians

throughout

the

world

to

properly

adjust,

repair

and

maintain

the

TEAC

A-450

Stereo

Cassette

Deck.

The

A-450

is

designed

to

be

used

with

a

high

quality

stereo

amplifier

system.

It

contains

many

of

the

standard

TEAC

features

such

as

selectable

BIAS

and

EQ,

DIN, MIC,

LINE

Inputs,

PAUSE

Control,

Auto-End-Stop,

PEAK

LEVEL

Indicator,

Large

VU

Meters,

TAPE

RUN

Indicator,

etc.

In

addition

it

has

Dolby

NR

Circuitry,

DOLBY

FM/COPY

Facility,

FM

MPX

Filter,

MIC/LINE

Mixing,

Outer-rotor

Motor

and

unexcelled

Wow

and

Flutter

Specs.

If

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.

This

manual

is

written

specifically

for

the

A-450

Model

distributed

in

the

U.S.A.

and

Canada.

However,

the

differences

in

models

distributed

elsewhere

is

very

small.

See

the

chart

on

page

30

for

a

comparison

of

the

various

models.

NOTE

When

ordering

replacement

parts,

please

refer

to

the

PARTS

LIST

which

is

printed

separately

from

this

manual.

_)

*

Noise

reduction

circuit

made

under

license

from

Dolby

Laboratories

Inc.

The

word

“Dolby”

and

the

Double-D

symbol

are

trademarks

of

Dolby

Laboratories

Inc.

TEAC

CORPORATION‘

51031682

CONTENTS

Specifications

&

Service

Data

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

3

Test

Equipment

Required

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

4

TEAC

Test

Tape

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

4

Partial

Dis-assembly

of

Main

Parts............

5

3-1.

Case/Front

Panel

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

6

3-2.

MOtOL

oie

cece

ee

ee

eae

ew

eee

6

3-3.

Cassette

Holder.

............6.--

7

3-4.

Head/Pinch

Roller

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

7

0

Vena

(-1:\¢

a

em

7

3-4B.

Pinch

Roller.................-

7

3-5.

Brake

Bracket

.............06-

8

3-6.

Capstan

Drive

Ass’y/Drive

Belt.

.....

8

3-7.

Reel

Table:

icscce

ve

ve

ae

eee

Sate

9

3-8.

Fast

Wind

Roller

Ass’y

..........

10

3-9,

Power

Transformer

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

10

3-10.

Play

Idler

Assy

.............2.-

11

Mechanical

Checks

and

Adjustments

..........

11

41.

Pinch

Roller

Pressure

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

11

42.

Take-Up

Torque

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

12

43.

Fast

Forward

Torque

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

12

44.

Rewind

Torque

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

13

Torque

Measurement

using

The

Cassette

Torque

Meter

........

13

4-5.

Brake

Tension

.............00-

13

4-6.

Tape

Speed/Wow

and

Flutter

......

14

4-6-1.

Tape

Speed

..............04.8.-

14

46-2.

Wowand

Flutter

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

14

Parts

Location

2.1.0.0...

cece

eee

ee

ee

eee

15

Lubrication

«2.0.2.0...

eee

ee ee

eee

16

61.

MOtOf

rei

gee

lot

Ae

oe

area

eRe

16

62.

Capstan

Assy

........20e

ee

eee

16

6-3.

Flywheel

Ass’y

............606-

16

Electrical

Checks

and

Adjustments

..........

16

7-1.

Playback

Performance

..........

17

7-1-1.

|

Record/Playback

Head

Azimuth

Adjustments

..........

7-1-2.

Specified

Output

Level

Setting......

7-1-3.

VU

Meter

Calibration

-Playback-

...

7-1-4.

|

Frequency

Response

-Playback-

7-1-5.

Signal

to

Noise

Ratio

-Playback-

....

7-1-6.

Headphone

Output

Level

Checks

....

7-2.

Monitor

Performance

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

7-2-1.

Minimum

Input

Level

Checks

......

7-2-2.

Specified

LINE

Control

Setting

7-2-3.

DOLBY

FM/COPY

CAL

Control

Setting

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

7-2-4,

VU

Meter

Calibration

-Record-......

7-2-5.

LED

Peak

Level

Indicator

Calibration

..............000-

7-2-6.

Dolby

NR

Effect

Measurement

7-2-7.

Dolby

FM

Compensator

Efficiency

Checks

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

7-3.

Recording

Performance

..........

7-3-1.

Bias

Trap

Adjustments

..........

7-3-2.

Record

Bias

Setting

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

7-3-3.

Record

Level

Setting

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

7-3-4.

Distortion

Checks

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

7-3-5.

Frequency

Response

-Overall-

......

7-3-6.

Signal

to

Noise

Ratio

-Overall-......

7-3-7.

Erase

Efficiency

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

7-3-8.

Channel

Separation

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

7-3-9.

Adjacent

Track

Crosstalk

Measurement

7-4.

Adjustment

Location

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

8.

Level

Diagram

.........

0...

eee

eee

eee

9.

Trouble-Shooting

...........

0...

eee

eee

10.

Model

Differences

Comparison

Chart

........

10-1.

Functional

Difference

Table

......

10-2.

Electrical

Alignment

Section

......

10-3.

Frequency

&

Voltage

Conversion

...

26

262mm

(10

546)

ES

i}

410mm(16

¥g')

445mm

(17

2’)

176

mm(6

jg)

—4

LTT

TTT

ty

Ea

ona

co

SISAL

M-O13-1

Fig.

1-1

A-450

Dimensions

1.

SPECIFICATIONS

&

SERVICE

DATA

SPECIFICATIONS

Track

System

Heads

Type

of

Tape

Tape

Speed

Inputs

(level

and

impedance)

Outputs

(level

and

impedance)

Equalization

Head

Configuration

Motor

Bias

Frequency

Operating

Position

Power

Requirements

Power

Consumption

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-track,

2-channel

stereo

Two:

Erase

and

Record/Playback

Cassette

tape,

C-60

and

C-90

(Philips

type)

4.8

cm/s

(1-7/8

ips)

Microphones:

Min.

input

level:

-67

dB

#2

dB

(10

Kohms

or

more)

Line:

Specified

input

level:

-5

dB

(50

Kohms)

Min.

input

level:

—15

dB

#2

dB

DIN*:

Min.

input

level:

-35

dB

+2

dB

DOLBY

FM/COPY:

—15

dB

+2

dB

Line

out:

Max.

output

level:

—3.5

dB

+1

dB

(50

Kohms)

Specified

output

level:

—5

dB

Headphones:

Specified

output

level:

—21

dB

+2

dB

(8

ohms)

EQ

1:

3180

us

+

70

us

(for

CrO,

tape)

EQ2:

3180

us

+

70

us

(for

FeCr

tape)

EQ

3:

3180

ws

+

120

us

(for

regular

Hi-Fi

tape)

1/2-track,

1-channel

Erase

Head

1/4-track,

2-channel

Record/Playback

Head

Hysteresis

synchronous

outer-rotor

motor

100

kHz

Horizontal

117V

AC,

60

Hz(U.S.A./Canada

Models)

100/117/220/240V

AC,

50/60

Hz

(General

Export

Models)

220V

AC,

50

Hz

(Europe

Models)

18

W

9.5

kg

(21

Ibs)

net

3,000

Hz

+30

Hz

Playback:

0.07%

(WRMS)

Record/Playback:

0.10%

(WRMS)

400

g420

g

(13.5

~

15.0

02)

Take

Up:

40

~70

g-cm

(0.6

~

1.0

oz-inch)

Fast

Forward:

100

g-cm

(1.4

oz-inch)

or

more

Rewind:

100

g-cm

(1.4

oz:inch)

or

more

100

seconds

for

C-60

4

seconds+2

sec.

Refer

to

frequency

response

limits

charts

on

page

18

and

24.

Playback

method:

47

dB

minimum

Record/Playback

method:

BIAS/EQ

1:

47

dB

minimum

BIAS/EQ

2,

3:

45

dB

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/EQ

1:

2.5%

(maximum)

BIAS/EQ

2:

2.5%

(maximum)

BIAS/EQ

3:

2.5%

(maximum)

NOTE:

©

Improvements

may

result

in

Specifications

and

Service

Data

changes.

e

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

comprensation

should

be

made.

2.

TEST

EQUIPMENT

REQUIRED

1.

Spring

scale:

For

take-up

torque

check:

For

fast

forward

&

rewind

torque

checks:

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.

2-2.

O-—70g

(O—2.50z.)

0

—

200

g

(0

—

7.0

oz.)

4,

Cassette

Torque

Meter:

For

take-up

torque

check:

0

—

100

g*cm

(0

—

1.4

oz.

inch)

For

fast

forward

&

rewind

torque

checks:

0—

160

g*cm

(0

—

2.2

oz.

inch)

*

Use

of

the

Cassette

Torque

Meter

instead

of

the

spring

scale,

if

you

have

one,

is

recommended

for

easier

measuring.

(See

Fig.

4-6

on

page

13)

*

When

ordering

Cassette

Torque

Meter,

allow

for

longer

delivery

time

that

is

required

for

it.

5.

Spring

scale:

For

Pinch

Roller

pressure

check:

0—

1

kg

(2.2

lbs)

6.

Wow/flutter

meter:

MEGURO

DENPA

SOKKI

K.K.,

Model

MK-668A

7.

Frequency

counter:

Digital

type,

capable

of

10

Hz

to

100

kHz

indication.

8.

AF

oscillator:

10

Hz

—

100

kHz

9,

AC

VTVM:

0.1

mV

—

300

V

10.

Attenuator:

General

Purpose

11.

Distortion

analyzer;

Basic

frequency

400

Hz/1

kHz

12.

Oscilloscope:

General

Purpose

13.

Band-pass

filter:

1

kHz

narrow

band-pass

type

14.

Test

load

resistor:

Non

inductive

type

8

ohm/1

W

15.

Plastic

alignment

tool:

16.

Head

demagnetizer;

TEAC

E-1

or

equivalent

17.

Cleaner:

TEAC

TZ-261

Tape

Recorder

Cleaner

kit

or

pure

alcohol

18.

Oil:

TEAC

TZ-255

Oil

kit

or

equivalent

TEAC

TEST

TAPE

For

tape

speed

&

wow/flutter

test

MTT-111:

MTT-502:

For

playback

performance

alignment

*

For

Dolby

level

Calibration

MTT-150:

MTT-116K:

MTT116U:

*

For

Playback

method

*

3,000

Hz/—10

dB

‘For

Record/playback

method

(blank

tape)

REMARKS:

0

dB

=

DIN

Reference

Level

(333

Hz)

For

record

performance

alignment

(blank

tape)

MTT-505TB:

For

BIAS

1/EQ

1

(CrO,)

MTT-504T:

For

BIAS

2/EQ

2

(Fe-Cr)

MTT-501:

For

BIAS

3/EQ

3

(Hi-Fi

tape)

NOTE:

The

TEAC

test

tapes

require

longer

delivery

time.

*

Dolby

B-type

tone

(modulated

400

Hz

tone),

200

nWb/m

*For

frequency

response

test

for

EQ1&

2(CrO,

&

Fe-Cr)

*

3180

us

+

7Ous

*315

Hz/-4

dB,

31.5

Hz

—

14

kHz/-24

dB

*For

frequency

response

test

for

EQ

3

(Hi-Fi

tape)

*

3180

ws

+

120

ps

*315

Hz/-4

dB,

31.5

Hz

—

14

kHz/-24

dB

Fig.

2-1

TEAC

Test

Tape

iff

Fig.

2-2

Spring

Scale

&

Cassette

Reel

Adapter

Fig.

2-3

Plastic

Alignment

Tool

TEAC

Tz-261

TAPE

RECORDER

i

CLEANER

Fig.

2-4

E-1

Head

Demagnetizer

Fig.

2-5

TZ-261

Tape

Recorder

Cleaner

Kit

Fig.

2-6

TZ-255

Oil

Kit

3.

PARTIAL

DIS-ASSEMBLY

OF

MAIN

PARTS

NOTE

1.

Use

the

proper

tools.

Demagnetize

the

tools

before

use.

When

mounting

or

removing

a

spring,

pay

heed

to

the

position

(direction)

of

the

anchor

or

hook.

The

wrong

position

may

result

in

a

change

in

the

tension.

3.

When

reassembling,

don’t

forget

to

reinstall

all

hardware

such

as

springs

and

washers,

etc.

4.

For

assembling

hardware

shape

identification,

see

ASSEMBL-

ING

HARDWARE

CODING

LIST

on

the

Parts

List.

3-1.

Remove

the

parts

in

the

following

sequence.

1.

NDARWH

When

removing

or

installing

the

Front

Panel,

set

the

BIAS/EQ

Switches

to

the

the

easier.

3-2.

i

2.

3.

CASE/FRONT

PANEL

Left

and

right

Sideboards

(C

and

E)

Head

Cover

(B)

Cassette

Storage

Tray

(A)

Trim

Case

Cover

(D)

Bottom

Cover

(H)

Six

Knobs

(G)

Front

Panel

(F)

2

position

and

other

switches

to

upper

position

to

make

work

MOTOR

Remove

the

Trim

Case

Cover.

See

the

above

section.

Release

the

Drive

Belt

from

the

Motor

Pulley.

Unsolder

the

3

wires

of

the

Motor

Ass’y

from

the

2L-5P

terminal

strip

located

inside

of

the

main

chassis.

Note

the

color

code

and

the

position

of

each

wire

prior

to

unsoldering

the

Motor

leads.

Lift

the

Motor

Ass’y

out

of

the

chassis.

NOTE

When

re-assembling,

clean

the

pulley

and

the

Belt

with

TEAC

TZ-261

Cleaner

kit

(“‘A”

for

the

Pulley,

“B”

for

the

Belt)

or

with

pure

alcohol.

Take

off

or

remount

the

Motor

Ass’y

taking

care

not

to

scratch

or

otherwise

damage

the

Motor

Pulley.

When

re-attaching

the

Drive

Belt

to

the

Pulley

do

not

twist

or

stretch

the

belt.

3-B

_M3x6

ied

=

SS

P

3-BM26x6

.

2-B

M26xl2

ZS

e

B

SES

>

@

K

SP

J

]

S

Fig.

3-2

Motor

Replacement

3-3.

CASSETTE

HOLDER

1.

Remove

the

Trim

Case

Cover.

See

2-PSA

M26x4

3-1

Section

on

page

6.

om

2.

Loosen

the

screw

(G)

and

then

C

0.9

-

ARR

artially

turn

the

Stopper

Bracket

:

G

-

partially

pp

c-3

Ba

kes

(H)

in

the

direction

of

the

arrow

to

enable

the

Cassette

Holder

(D)

to

be

readily

removed.

3.

Remove

the

Spring

(E)

from

the

hook

(C)

of

the

Cassette

Holder.

4.

Remove

the

other

end

of

the

Spring

(E)

from

the

Lever

(F)

to

retain

it.

5.

Remove

the

Cassette

Holder

Shaft

(A)

by

taking

off

the

2

E-rings

to

separate

the

Cassette

Holder

from

the

Cassette

Holder

Retainer

(B).

6.

Remove

the

Cassette

Holder

from

the

Retainer.

:

A

7.

If

necessary,

remove

the

Retainer

SY

Es

Pe

2

a

nS

from

the

chassis

by

taking

off

the

2

screws.

3-4.

HEAD/PINCH

ROLLER

A

3-4A.

HEAD

1.

Remove

the

E-ring

(A)

and

remove

the

Spring

(C)

from

B

the

hook

(D)

of

the

Head

Base

Plate

and

the

tab

of

the

Pinch

Roller

Ass’y

(B).

2.

Remove

the

Pinch

Roller

Ass’y

from

the

pivot

stud

pin

(E).

[

N-M2

REC/PLAY

HEAD

.

3-4B.

PINCH

ROLLER

After

removing

the

Trim

Case

Cover

(see

3-1),do

the

following

procedure.

1.

Unsolder

each

lead

wire

from

the

terminal

pin

of

the

heads

to

facilitate

replacement.

To

re-solder

each

head

wire

to

the

newly

replaced

head,

refer

to

Fig.

3-5.

2.

Lift

up

the

heads

after

taking

off

the

hardware

mounting

them.

When

removing

the

nut,

do

not

loose

T-455

Washer

(F)

and

Spring

(G).

Fig.

3-4

Head/Pinch

Roller

Replacement

ERASE

REC/PLAY

NOTE

1.

After

replacing

the

head,

always

adjust

the

head

GRN

alignment

especially

the

Record/Playback

Head’s

BLU

azimuth

(see

7-1-1),

and

then

secure

the

screws

and/or

the

nut

with

a

drop

of

locking

paint.

T-463

Fig.

3-5

Head

Wiring

Diagram

2.

Connect

the

wires

to

the

head

terminal

pins

quickly

to

prevent

breaking

of

internal

wires

of

the

head

due

to

overheating.

3.

After

replacement,

always

clean

the

driving

surfaces

of

the

Pinch

Roller

with

the

TEAC

TZ-261B

Rubber

Cleaner

or

with pure

alcohol,

then

proceed

directly

to

the

PINCH

ROLLER

PRESSURE

adjustment

section.

See

page

11.

3-5.

BRAKE

BRACKET

1.

Remove

the

Trim

Case

Cover.

See

3-1

section.

2.

Remove

the

Cassette

Holder.

See

3-3

section.

3.

Detach

the

2

E-rings

(A)

and

then

take

off

the

Spring

(B)

and

the

Brake

Bracket

(C)

from

the

chassis.

4.

Remove

each

Brake

Shoe

(D)

from

the

Brake

Bracket.

3-6.

CAPSTAN

DRIVE

ASS’Y/DRIVE

BELT

1.

Remove

the

Bottom

Cover.

See

3-1

section.

Detach

the

Flywheel

Bearing

Plate

(A)

from

the

mounting

studs

(D

and

F)

by

taking

off

the

2

screws.

3.

Take

out

the

Drive

Belt

(C)

from

the

Flywheel

(B)

and

the

Motor

Pulley

(G).

4.

Carefully

lift

out

the

Flywheel

from

the

Capstan

Housing

Ass’y

(E).

5.

Remove

the

Capstan

Housing

Ass’y

from

the

chassis

by

unscrewing

the

3

screws.

NOTE

1.

Since

the

Capstan

Drive

Ass’y

is

a

precision

part,

TEAC

specially

distributes

the

Flywheel

and

the

Capstan

Housing

Ass’y

as

a

whole

assembly.

Hence,

always

replace

the

Flywheel

together

with

the

Capstan

Housing

Ass’y.

2.

Clean

all

driving

surfaces

of

the

Flywheel

and

the

Drive

Belt

with

TEAC

TZ-261

Cleaner

kit

(“‘A”

for

Flywheel.

““B”

for

Belt)

or

with

pure

alcohol.

3.

Do

not

bend

the

Capstan

Shaft

as

this

will

increase

wow/flutter

or

speed

deviation.

4.

During

re-assembly

re-attach

the

Drive

Belt

with-

out

twisting

or

stretching

it.

5.

The

Belt

should

always

be

attached

right

and

in

the

predetermined

place.

Lubrication:

For

lubrication

of

the

newly

replaced

Capstan

Drive

Ass’y,

the

following

should

be

observed.

1.

Apply

a

drop

of

a

light

machine

oil

of

good

quality

(e.g.:

TEAC

TZ-255)

with

an

oil

ap-

plicator

to

the

shaft

of

the

Flywheel

and

spread

oil

evenly

over

the

shaft

with

a

flannel

cloth.

Afier

installing

the

Flywheel,

be

sure

to

clean

the

tape

moving

portion

of

shaft

with

TEAC

TZ-261A

Head

Cleaner

or

with

pure

alcohol.

Viewed

from

Bottom

Viewed

from

Bottom

T-458

Fig.

3-7

Capastan

Drive

Ass’y/Drive

Belt

Replacements

Apply

a

drop

of

the

proper

oil

in

the

same

way

as

above

to

the

innermost

area

of

capstan

shaft

(next

to

the

Flywheel).

Apply

a

film

of

light

grease

to

the

well

of

the

Flywheel

Bearing

Plate.

3-7.

REEL

TABLE

1.

Remove

the

Trim

Case

Cover.

See

3-1

section.

See

Fig.

3-8

for

step

2

to

4.

Remove

the

Spring

(A)

from

the

hook

(B)

of

the

Cassette

Holder

(D).

Loosen

the

screw

on

the

Stopper

Bracket

(C)

and

then

partially

turn

the

Bracket

in

the

direction

indicated

by

the

arrow.

Rotate

the

Cassette

Holder

away

from

the

Reel

Tables

(E

and

F).

Remove

the

Bottom

Cover.

See

3-1

section.

Remove

the

Drive

Belt

and

the

Flywheel.

See

3-6.

See

Fig.

3-9

for

step

7

to

9.

When

only

the

Supply

Reel

Table

(J)

is

to

be

removed,

first

take

out

the

Back

T464

Fig.

3-8

Rotation

of

Cassette

Holder

Tension

Bracket

(H)

riding

in

the

Wheel

by

taking

off

the

Screw

(G).

At

this

time,

note

the

predetermined

position

(direction)

of

the

Spring

(I)

for

reinstalling.

For

Detaching

the

Take-up

Reel

Table

(K),

first

take

out

the

Large

Counter

Belt

(L).

Take

off

the

screws

mounting

the

Reel

Table

which

requires

replacement;

next,

with

the

PLAY

key

de-

pressed

to

release

the

Brake

Shoes

(M)

from

the

Reel

Tables,

pull

out

the

table.

NOTE

Always

replace

the

complete

Reel

Table

Ass’y

as

an

entire

assembly,

““Take-up”

or

“Supply”.

!

Viewed

from

Bottom

Ce

we

Sy

bp

T-459

Fig.

3-9

Reel

Tables

Replacement

3-8.

FAST

WIND

ROLLER

ASS’Y

Pee

3-9.

POWER

TRANSFORMER

1.

2.

Remove

the

Trim

Case

Cover.

See

3-1

section.

Rotate

the

Cassette

Holder

away

from

the

Reel

Tables.

See

3-7

section

on

page

9.

Remove

the

Bottom

Cover.

See

3-1

section.

Remove

the

Drive

Belt

and

the

Flywheel.

See

3-6.

Remove

the

Spring

(C)

from

the

hook

(G)

of

the

F.F.

Lever.

Gently

take

off

the

2

E-rings

(B

and

H)

and

lift

out

the

Fast

Wind

Roller

Ass’y

(A)

from

the

stud

(F).

In

doing

this

do

not

tilt

the

assembly

at

any

angle

as

this

may

damage

the

Roller

Pin

(D)

and

the

Spring

(E)

or

cause

them

to

be

bent

or

broken.

If

it

is

necessary

to

further

disassemble

the

Fast

Wind

Roller

Ass’y,

refer

to

the

DETAIL

OF

“A”

figure.

NOTE

During

remounting

of

the

removed

Fast

Wind

Roller

Ass’y,

do

the

following:

1.

Lubricate

the

entire

shaft

with

a

thin

application

of

light

machine

oil.

(e.g.:

TEAC

TZ-255)

2.

Clean

the

Fast

Wind

Belt

and

all

friction

surfaces

of

the

Rollers

with

TEAC

TZ-261B

Rubber

Cleaner

or

with

pure

alcohol

before

re-installing

the

Belt.

2B,

DETAIL

Cc

M4xl0

OF

ay

ND

Remove

the

Trim

Case

Cover

and

the

Bottom

Cover.

See

3-1

section

on

page

6.

Unsolder

each

wire

of

the

Power

Transformer

(B).

Note

the

color

code

and

position

of

each

wire

prior

to

unsoldering

the

Transformer

leads.

Take

off

the

4

screws

(G)

and

remove

the

complete

Transformer

Ass’y

(A)

from

the

main

chassis.

Separate

the

Transformer

body

and

the

Mounting

Plates

(D,

E,

F)

by

taking

off

the

2

screws

(C).

NOTE

When

teinstalling

the

new

Transformer,

loosely

tighten

the

2

screws

(C)

to

attach

the

Transformer

body

and

the

mounting

plate

(E).

Then

after

attach-

ing

the

complete

Transformer

Ass’y

(A)

to

the

main

—

chassis,

position

the

transformer

body

by

sliding

it

in

&

i

a

either

direction

as

shown

by

the

arrows

to

find

the

: :

position

that

produces

the

lowest

hum.

After

this,

firmly

tighten

the

2

screws

(C).

4-BSA

M3x8

T-a62

Fig.

3-11

Power

Transformer

Replacement

10