Toshiba KT-4568 Montageanleitung

SERVICE

DATA

FILE

NO.

100-304

TOSHIBA

STEREO

RADIO

CASSETTE

PLAYER

KT-4568

70

STATION

PRESET

DIGITAL/TUNER/

SPECIFICATIONS

Track

system:

Recommended

tape:

Tape

speed:

Frequency

response:

Graphic

equalizer:

Receiving

frequency:

Stereophonic

Normal

ferric,

chrome

dioxide,

and

metal

alloy:

C-30

to

C-90

(Recorded

tape)

4.8

cm/sec.

Reproduction:

40

Hz

to

14

kHz

(normal),

40

Hz

to

16

kHz

(METAL/CrO,)

100

Hz,

1

kHz,

10

kHz

U.S.A.,

Canada

FM:

87.5

MHz

to

108

MHz

(0.1

MHz

steps)

Case

©

530 kHz

to

1610

kHz

(10

kHz

steps)

Case

@

531

kHz

to

1602

kHz

(9

kHz

steps)

Europe,

Australia,

others

FM:

87.5

MHz

to

108

MHz

(0.05

MHz

steps)

AM:

Specifications

are

subject

to

change

without

notice.

Intermediate

frequency:

Antenna:

Output

terminal:

Maximum

output

power:

Power

supply:

Dimensions:

Weight:

PRINTED

IN

JAPAN

22905819

June,

1988

©

AM:

Case

©

531

kHz

to

1602

kHz

(9

kHz

steps)

Case

®

530

kHz

to

1610

kHz

(10

kHz

steps)

FM:

10.7

MHz

AM:

450

kHz

FM:

Headphones

cord

AM:

Ferrite-core

antenna

3.5

mm

dia.

stereo

headphones

jack

x

1

Integration

60

mW

(30

mW

+

30

mW)

3V

DC

(IEC

R6

“AA”

cell

x

2)

External

power

source

supplied

to

the

[DC

IN

3V]

jack

(3.4

mm

dia.

center

connect

negative).

83.5(W)

x

120(H)

x

32.8

(D)

mm

245g

(without

batteries)

K-TA,

TC,

TE,

AY,

VF

OPERATING

CONTROLS

@

[=STOP]

button

@

[>>

REW/FF]

button

©

[<4

FF/REW]

button

@

[<P

PLAY]

button

©

[DIRECTION]

button

@

[REVERSE

MODE]

selector

@

AM

Step

Frequency

selector

(Inside

of

the

cassette

compartment

lid)

@

[GRAPHIC

EQUALIZER]

controls

©

[45]

]

button

@

[MEMORY]

button

@®

[FM/AM]

band

button

@

[<

TUNING

>]

Tuning

buttons/

[HOUR,

MIN]

Time

set

buttons

(dual

operation)

®

[MODE]

button

@

[ALARM]

button

@

[ALARM

STOP]

button

©

Preset

buttons

@

[VOLUME]

control

TOSHIBA

STEREO

RADIO

CASSETTE

PLAYER

mMobEL

No.

KT-4568

DE

3V

===

POWER

SOURCE

IEG

R6(“AA*

CELL)

X2

TOSHIBA

CORPORATION

MADE

IN

JAPAN

AM

531-1602

kHz

©

[OPEN]

button

©

[NORMAL,

METAL/CrO2]

Tape

selector

@

[FM-MONO,

FM-ST]

FM

mode

selector/[

00

OFF,

00

ON]

Dolby*

NR

selector

(dual

operation)

@

[TAPE/RADIO

[OFF]

,

RADIO]

Function

selector

@

[PHONES]

jack

@®

[FWD,

REV]

Tape

direction

indicators/[BATT]

indicators

(dual

operation)

@

Battery

compartment

lid

®

[DC

IN

3V]

jack

@

Headphones

*

Dolby

noise

reduction

manufactured

under

license

from

Dolby

Laborato-

ries

Licensing

Corporation.

‘“DOLBY’’

and

the

double-D

symbol

O00

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

FM

87.5-108

MHz

MINI

STERO

PT.

(D.M.

25.

6.

85/

D.M.

27.

8.87)

N.2/01070/05635

Europe/Australia/Others

Indicator

Section

|

t

[ALARM]

Indicator

Section

e

This

indicator

section

contains

both

the

time

and

radio

displays.

For

the

time

display:

[

[ALARM]

[ON]

]

indicator

[

[ALARM

]

indicator

[TIME]

indicator

For

the

radio

display:

[

]

indicator

[

]

indicator

[

]

indicator

@

[FM,

AM]

indicator

@

Frequency

indicator

e886

668

TOSHIBA

STEREO

RADIO

CASSETTE

PLAYER

mopbEL

No.

KT-4568

POWER

SOURCE

IEC

R6(“AA™

CELL)

x2

TOSHIBA

CORPORATION

FREQ.RANGE

BOY

Se

FM

87.5-108

MHz

AM

530-1610

kHz

MADE

IN

JAPAN

U.S.A./Canada

DISASSEMBLY

INSTRUCTIONS

BACK

CABINET

REMOVAL

¢1.7

x

6mm

1.

Remove

one

screw

@,

two

screws

®and

two

screws

©.

Note

1:

For

the

model

whose

model

number

is

more

than

#22001,

one

screw

is

added

on

the

©

section.

So

remove

the

screw

also

when

removing

the

back

cabinet.

2.

Remove

the

back

cabinet

from

the

unit

slowly.

Note

2:

The

mask

sheet

is

pasted

on

the

Osection

of

the

back

cabinet

for

servicing.

For the

unit

with

the

screw

is

tightened

on

the

Osection,

remove

the

mask

sheet

by

using

the

screw-

driver.

Back

Cabinet

Figure

1

DC

Jack

©

$1.7

x

4mm

Figure

2

Figure

3

FRONT

CABINET

REMOVAL

1.

Remove

the

back

cabinet.

2.

Remove

two

screws

©.

3.

Remove

the

front

cabinet

from

the

©

or

@

section.

Note

3:

There

are

steel

balls

and

springs

in

the

®and

@section.

Be

sure

not

to

miss

them.

Front

Cabinet

‘Doty

noise

reduction

manufactured

under

|

Sense

fom

Dolby

Laboratories

Licedsing

oxpixation.

“OORy"

and

tea

doibie

‘Symbol

ae

trademarks

of

Dolby

Labocatores

{_

Eeensing

Gomporation.

E

Rigure:4

Figure

5

ADJUSTMENTS

Z|

COO3

TN

FM

Ant,

4)

clo08

AM

Ant.

)

Figure

6

AM

ALIGNMENT

1.

2.

3.

oO

Turn

on

the

AM

signal

generator,

sweep

generator

and

the

VTVM

allowing

a

fifteen-minute

warm-up

period.

First,

do

the

AM-IF-Alignment

(AM

ALIGNMENT

CHART),

refering

to

Figure

7.

Using

the

test

loop

across

the

output

of

the

signal

generator,

inductively

connect

the

signal

generator

to

the

radio.

(Figure

8)

.

Connect

the

VTVM

across

the

Pins

No.

12

and

19

(Q101)

.

Set

signal

generator

frequency

as

listed

in

ALIGNMENT

CHART

and

maintain

a

sufficient

output

level

to

provide

an

indica-

tion

on

VTVM.

.

Set

volume

control

at

mid-position.

SCOPE

ANTENNA

COIL

AM

450

kHz

SWEEP

GENERATOR

ONE-TURN

COIL

Figure

7

Q101

LOOP

ANTENNA

AM

SIGNAL

UNIT

UNDER

GENERATOR

ANTENNA

TEST

Figure

8

AM

ALIGNMNET

CHART

Signal

Generator

Frequency

Setting

Adjustment

Remarks

Frequency

Adjust

coil

T102

until

450

kHz

Lowest

Frequency

T102

best

signal

peak

is

obtained.

Ant.

Coil

Adjust

for

maximum

T103

inidication.

600

kHz

Tune

to

Signal.

Ant.

Trim.

Adjust

for

maximum

C108

indication.

1400

kHz

Tune

to

Signal.

Repeat

steps

2

and

3

as

required.

FM-IF

ALIGNMENT

1.

Set

the

select

switch

to

FM

position.

2.

Turn

on

both

sweep

generator

and

oscilloscope,

and

allow

a

fifteen-minute

warm-up

period.

3.

Connect

the

RF

SWEEP

SIGNAL

OUTPUT

of

the

sweep

generator

to

the

test

points

TP3

and

TP4.

(Figure

9)

4.

Connect

the

oscilloscope

vertical

input

directly

to

the

test

points

TP1

and

connect

the

shielded

lead

to

the

test

point

TP2.

5.

Connect

the

SWEEP

VOLTAGE

OUTPUT

to

the

sweep

generator

to

the

oscilloscope

Horizontal

input.

6.

Proceed

as

outlined

in

the

FM-IF

ALIGNMENT

CHART.

FM-IF

ALIGNMENT

CHART

Frequency

i

Setting

Connection

Set

scope

for

con-

necting

output

signal

from

TP1

to

Lowest

vertical

axis

of

Frequency

scope

“V”

and

sweep

generator

10.7

MHz

+

25kHz

output

to

horizontal

axis

“H”.

S

CURVE

Sweep

generator

of

10.7

MHz

center

freq.

with

10.7

MHz

marker.

UNIT

UNDER

FM

SWEEP

GENERATOR

Figure

9

FM-RF

ALIGNMENT

Turn

on

the

signal

generator

and

the

VTVM,

and

allow

a

fifteen-minute

warm-up

period.

Connect

the

signal

generator

output

through

a

75

ohm

dummy

antenna

across

FM

antenna.

(Figure

10)

Connect

the

VTVM

across

the

test

points

TP1

and

TP2.

Set

the

volume

control

to

mid-position.

Adjust

the

signal

generator

frequency

as

indicated

in

FM-RF

ALIGNMENT

CHART,

and

maintain

a

sufficient

signal

output

level

to

provide

a

measurable

indication.

6.

Proceed

as

outlined

in

the

FM-RF

ALIGNMENT

CHART.

aPWON

>

FM-RF

ALIGNMENT

CHART

Signal

Generator

Radio

Dial

Setting

Adjustment

Remarks

Ant.

Coil

90.1

MHz

L001

|

Adjust

for

maximum

Tune

to

signal.

ee Se

Ant.

Trim.

output

indication.

106.1

MHz

C003

Repeat

steps

1

and

2

required.

FM

SIGNAL

GENERATOR

DUMMY

ANTENNA

50

OHM

Figure

10

OUTPUT

LEVEL

ADJUSTMENT

I.

Preliminary

Work

1)

Place

function

switch

in

“NORMAL”

position.

2)

Place

Dolby

switch

in

“IN”

position.

3)

Load

MTT-150

(ATT-150)

400

Hz

test

tape.

4)

Connect

a

lead

(terminated

with

alligator

clip)

of

VTVM

to

Dolby

output

terminal

and

another

lead

to

chassis

ground.

Level

Adjustment

1)

Playback

the

test

tape.

2)

Adjust

trimming

post

semi-fixed

resisstor

R401

(L

ch),

R402

(R

ch)

until

output

reading

of

100mV

+8mV

is

obtained

on

the

VTVM,

using

alignmnet

driver.

(Proceed

this

alignment

for

both

left

and

right

channels.)

Note:

When

connecting

alligator

clip

to

the

output

terminal,

clip

it

to

C503

(or

13

of

Q501),

C504

(or

4

or

Q501).

MOTOR

SPEED

ADJUSTMNET

1.

Connect

a

VTVM

or

a

Frequency

counter

to

the

headphone

jack.

2.

Insert

cassette

test

tape

(MTT-111,

3

kHz).

3.

Playback

the

test

tape

in|

FWD

|direction

about

tape

start.

4.

Adjust

R904

for

3000

Hz

+15

Hz

reading

on

the

frequency

counter.

CURRENT

CONSUMPTION

HARB

es

6

cuore

o.xa

ve

Ose

sade

anders

don

ie

160mA

FIM

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47mA

AM:

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37mA

CASSETTE

MECHA.

TORQUE

PLAN

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toss

csc

cap

as

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~

55g-cm

FEAR

EW

sii

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dardtioe

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More

than

55g

-

cm

ELECTRICAL

PARTS

LOCATIONS

Main

P.C.Board

DC

Jack

Leaf

SW(Reverse)

$902

Motor

Switch

PC.Board

S90!

|

eaf

SW

L—

(Play)

tos.

Antenna

Coil

LED

P.C.Board

REV

FWD

To

Head

EPO5

Flexible

PC.Board

Phone

Jack

Battery

Spring

EPO4

Flexible

PC.Board

Synth.

P.C.Board

Frequency

E,

1OOHz

|

KHz

Zz

1OKHz

EPO2

Piezo

Alarm

G.

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PC.Boar

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Q.0

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FM

STEREO

|

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1

921nV

921mV

2|

1.64v

|

_1.64V

3

|

2.82v

|

2.80v

|

4]

16ov

|

1.61V

5

ov

6

|

2.78V

|

2.82V

T|_2.76v

|

2.75V

2.807

Q1

0

1

(TASIS2AF)

FM FM

AM

STEREO

|

MONO

1[

2.85v

|

2.87

|

2.93V

2[

135av

|

892ev

|

9d5nV

3

|

2.85v

|

2.87V

|

2.93V

4|_2.85v

|

2.87v

|

2.59V

5

|

2.85V

|

140av

|

2.93V

6

|

2.2

|

2.26v

|

2.32v

7{

1.49

[1.490

|

280av

8

820V

82.

10V

81nV

9

|

2.85v

|

2.877

|

2.93

|

10]

—

|

ll

ov

|

2.37

|

2.37v

|

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ov

|

13]

952av

|

959av

|

958aV

|

14|

9750V

|

983nv

|

982aV

15[

2.1ev

|

2.38v

|

2.67V

16{

1.6ev

|

2.55v

|

2.91V

17|_2.0av

|

2.8ev

|

2.62v

18|

6240v

|

625ev

|

623aV

19[_1.34v

|

1.41v

[|

1.26v

20{

1.98v

|

2.00v

|

2.81V

ai{

2.eav

|

2.87v

|

2.92V

22|

2.65V

|

2.68

|

2.20V

23|

2.85v

|

2.87v

|

2.93V

Q1.0

3

(RN2204)

2.84V

1.0

4

(RN2204)

FM

STEREO

MONO

STEREO

|

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E

Cc

2,85

2.02V

2.87V

2.86V

2.87V

B

2.82V

ov

Q1.0

5

(25C2458)

E

Cc

B

Q3

0

1

(TAT6B8F)

5

0

1

(NJM2063AM)

PLAY

1 1.47V

2

1.47

3

—=

4

L.ATV

5

==

6

2.52V

1

1.53V

8

ov

9

3.00V

10

1.52V

ll

2.54V

12

are

13]

2.99V

4

—

15]

1,47V

16]

1.47V

Q4_0

1

(NJM2067M)

aX

2

3[

2.sav

|

2.5av

|

2.5av

|

2.54v

4

1.47V

1.47V 1.47V 1.47V

KE

ov

|

ov

6[

ia

[

iaw

lia

|

1.47

it

1.47V 1.47V

1.47V

L.A7v

8

|

575aV

49nV

|

575aV

49

9

ov

|

S72av

ov

|

559aV

10[

_1.60V

Tonv

|

1.60V

790V

1i[_400v

|

1.61V

40nv

|

1.61V

12[

137m

|

137av [1.47

[|

1.47V

13[

1.54v

|

1.5av

|

1.54v

|

1.52V

14]

1.47

1.47V

{|

1.47V

{a5[

isev

|

1.5iv

{

1.56v

[

1.51V

|

16;

__(1.47V

1L.47V

LAV

L.47V

MECHANISM

EXPLODED

VIEW

(UPPER)

MECHANISM

EXPLODED

VIEW

(LOWER)

62

NOTE:

Parts

excluded

in

the

parts

list

are

not

stocked

NOTE:

Parts

exciuded

in

the

parts

list

are

not

stocked

since

they

are

seldom

required

for

routine

service.

Some

since

they

are

seldom

required

for

routine

service.

Some

delay

should

be

anticipated

when

ordering

these

items.

delay

should

be

anticipated

when

ordering

these

items.

Des

=

4t—

Location

CASSETTE

MECHANISM

PARTS

LIST

No.

Part

No.

Description

51

25759175

BELT,

CAPSTAN

52

25797283

FLYWHEEL

ASSY,

T

53

25797284

FLYWHEEL

ASSY

54

25766541

WASHER,

2.1X4.0X0.2MM,

TE

56

25770209

SPRING

TENSION

60

25778684

SPRING

62

22709279

SCREW,

1.4X3.8MM

64

25778685

SPRING

66

25735296

RING,

1.6X3.2X0.25MM

67

25778686

SPRING

68

25797280

ROLLER

ASSY,

PRESSURE

70

22707638

SCREW,

1.7X4.5MM,

B,

BID

71

25757317

GEAR,

FR

72

25747437

LEVER,

FR

73

25757318

GEAR,

S

REEL

74

25757319

GEAR,

T

REEL

75

25766542

WASHER,

1.6X3.5X0.13MM,

PE

76

25757320

GEAR,

R

77

25778687

SPRING

78

25797281

ROLLER

ASSY,

PRESSURE

79

22217550

HEAD,

PLAYBACK

102

22709280

SCREW,

1.4X3MM

103

25747438

LEVER,

MODE

106

25757321

GEAR,

CAM

108

25770210

SPRING

DIR.

LEVER

110

25778688

SPRING

FF

LEVER

111

25757322

GEAR,

DECELERATION

13

25766543

WASHER,

1.25X3.5X0.25MM,

PE

115

25757323

GEAR,

T

116

25770211

SPRING

LOCK

PLATE

120

25770212

SPRING

TENSION

122

25797282

WHEEL

ASSY,

MIDWAY

123

25792459

MOTOR

ASSY

=~

13

Location

No.

Part

No.

Description

CABINET

EXPLODED

VIEW

318

For

the

units

with

the

manufacturing

No.

22001

and

on,

only

the

FF

button

is

fixed

with

a

screw(REW

and

STOP

button

are

no

longer

fixed

with

screws).

NOTE:

Parts

excluded

in

the

parts

list

are

not

stocked

since

they

are

seldom

required

for

routine

service.

Some

delay

should

be

anticipated

when

ordering

these

items.

—14—

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