Panasonic Tx-21s1t User manual

Panasoni

Service

Manual

Colour

Television

Z—5

Chassis

TX-—21S1T

/TC-—21S1R

TX—14S1T

/TC—14S1R

Power

Source

:

220

/

240

V

AC

50Hz.

58W

TX—21S1T

/

TC—21S1R

39W

TX-1451T

/

TC—14S1R

Power

Consumption

:

Aerial

impedance

:

75Q

unbalanced,

Coaxial

Type

Receiving

System

:

PAL

—

|

(UHF)

PAL

—

60

Receiving

Channels

:

UHF

E21

—

E69

Intermediate

Frequency

:

Video

39.5

MHz

Sound

33.5

MHz

Colour

35.07

MHz

PAL

Video/Audio

Terminals

AV1

IN

Video

(21

pin)

1Vp—p

75Q

Audio

(21

pin)

500mVrms

10kQ

RGB

(21

pin)

AV1

OUT

Video

(21

pin)

1

Vp—p

75Q

Audio

(21

pin)

500

mV

rms1kQ

RCA

IN

Video

1

Vp—p

752

RCA

IN

Audio

500

mVrms,

10KQ

ORDER

NO.

SM-—94001

A51EAL55X13

51

cm

V

90°

measured

diagonally

A34EAC01X13

\

36

cm

V

90°

measured

diagonally.

Picture

Tube

:

Audio

Output

:

5

Watt

8Q,

Rectangular

Remote

Control

2

x

R6(UMS3)

Batteries

High

Voltage

:(zero

beam

current)

21S1

Series

14S1

Series

26.4Kv

21.5Kv

21S1

Series

1481

Series

Speaker

Accessories

supplied

:

Dimensions

:

Height:

477mm

364mm

Width:

518mm

389mm

Depth:

478mm

384mm

21S1

Series

14S1

Series

Net

Weight

21Kg

10Kg

Specifications

are

subject

to

change

without

notice.

Weight

and

dimensions

shown

are

approximate.

IMPORTANT

This

receiver

uses

a

HOT

chassis,

after

service

please

ensure

that

the

chassis

is

returned

to

its

correct

position.

Particular

care

being

taken

to

the

position

of

the

customer

controls.

Failure

to

do

so

could

endanger

customer

safety.

Panasonic

(U.K.)

LTD.

WILLOUGHBY

ROAD,

BRACKNELL,

BERKS,

RG12

8FT.

BX—21511/1C-21351R

VELSMeSs

on

Contents

Safety

Precautions

......

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Location

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Controls

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Adjustment

Procedure

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VIEWS

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Safety

Precautions

General

Guide

Lines

1.

It

is

advisable

to

insert

an

isolation

transformer

in

the

AC

supply

before

servicing

a

hot

chassis.

2.

When

servicing,

observe

the

original

lead

dress

in

the

high

voltage

circuits.

If

a

short

circuit

is

found,

replace

all

parts

which

have

been

overheated

or

damaged

by

the

short

circuit.

3.

After

servicing,

see

that

all

the

protective

devices

such

as

insulation

barriers,

insulation

papers,

shields

and

isolation

R—C

combinations

are

correctly

installed.

4.

When

the

receiver

is

not

being

used

for

a

long

period

of

time,

unplug

the

power

cord

from

the

AC

outlet.

5.

Potentials

as

high

as

26.4Kv

kV

are

present

when

this

receiver

is

in

operation.

Operation

of

the

receiver

without

the

rear

cover

involves

the

danger

of

a

shock

hazard

from

the

receiver

power

supply.

Servicing

should

not

be

attempted

by

anyone

who

is

not

familiar

with

the

precautions

necessary

when

working

.on

high

voltage

equipment.

Always

discharge

the

anode

of

the

picture

to

the

chassis

before

handling

the

tube.

6.

After

servicing

make

the

following

leakage

current

checks

to

prevent

the

customer

from

being

exposed

to

shock

hazards.

Leakage

Current

Cold

Check

1.

Unplug

the

AC

cord

andconnect

ajumper

between

thetwo

prongs

of

the

plug.

Turn

on

the

receiver's

power

switch.

Measure

the

resistance

value

with

an

ohmmeter,

between

the

jumpered

AC

plug

and

each

exposed

metallic

cabinet

part

on

the

receiver,

such

as

screw

heads,

aerials

,

connectors,

control

shafts

etc.

When

the

exposed

metallic

part

has

a

return

path

to

the

chassis

the

reading

should

be

between

4M

Q

and

20M

Q.

When

the

exposed

metal

does

not

have

a

return

path

to

the

chassis

the

reading

must

be

infinite.

Leakage

Current

Hot

Check

1.

Plug

the

AC

cord

directly

into

the

AC

outlet.

Do

not

use

an

isolation

transformer

for

this

check.

2.

Connect

a

2k

ohm 10W

resistor

in

series

with

an

exposed

metallic

part

on

the

receiver

and

an

earth

such

as

a

water

pipe.

3.

Use

an

AC

voltmeter

with

high

impedance

to

measure

the

potential

across

the

resistor.

4.

Check

each

exposed

Metallic

partand

check

the

voltage

at

each

point.

5.

Reverse

the

AC

plug

at

the

outlet

and

repeat

each

of

the

above

measurements.

6.

The

potential

at

any

point

should

not

exceed

1.4

Vrms.

In

case

ameasurementis

outside

the

limits

specified,

there

is

a

possibility

of

a

shock

hazard,

and

the

receiver

should

be

repaired

and

rechecked

before

it

is

returned

to

the

customer.

HOT

CHECK

CIRCUIT

A.C.

Voltmeter

Water

Pipe

To

Instrument’s

|

(Earth)

exposed

metallic

parts

2K

ohm

10W

Fig.1

X—Radiation

Warning

1.

The

potential

sources

of

X—Radiation

in

TV

sets

are

the

high

voltage

section

and

the

picture

tube.

2.

Whenusingapicture

tube

testjig

for

service

ensure

thatthe

jig

is

capable

of

handling

28.0

kV(21S1

Series)

and

23kV

(14S1

Series)

without

causing

X—

Radiation.

NOTE

:

itis

important

to

use

an

accurate

periodically

calibrated

high

voltage

meter

2

1.

Set

the

brightness

to

minimum.

2.

Measure

the

high

voltage.

The

meter

should

indicate:—

26.4Kv

+

1.5

kV

(2181

Series)

21.5Kv

+

1.5

kV

(1481

Series)

ifthe

meterindicationis

out

oftolerance,

immediate

service

and

correction

is

required

to

prevent

the

possibility

of

premature

component

failure.

3.

To

prevent

an

X—Radiation

possibility,

itis

essential

to

use

the

specified

tube.

TX-21811/1C-2151F

BP

SLSSALSESSI:

SHUT

DOWN

CIRCUIT

TEST

This

test

must

be

made

as

a

final

check

before

the

set

is

returned

to

the

customer.

1.

2.

Receive

the

Phillips

pattern.

Check

that

the

shut-down

circuit

functions

when

—60V

is

applied

to

TPE40,

but

does

not

function

when

—40V

is

applied.

Location

Of

Controls

RED

CUTOFF

R364

GREEN

DRIVE

R357

GREEN

CUTOFF

R362

RED

DRIVE

R358

BLUE

CUTOFF

R369

H.WIDTH

L552

SUB

GLR

R607

TEXT

CONTRAST

H.

CENT

R502

R3515

R.FAGC

R109

V.

CENTRE

$451

SERVICE

SWITCH

$301

SUB

CONT

SUB

BRT

V.

HEIGHT

R465

Fig.

2

R316

(R306)

How

to

move

the

chassis

into

the

Service

position

1.

2.

Hold

and

lift

the

rear

of

the

E—

PCB

chassis

and

gently

pull

the

chassis

toward

you.

Release

the

respective

wiring

clips

and

rotate

the

chassis

clockwise.

For

the

21”

model,

a)

Place

the

lower

edge

of

the

chassis

against

the

’L’

shaped

stopper

located

in

the

chassis

rail

whilst

sliding

the

upper

edge

of

the

board

into

the

chassis

holding

rib.

OR

b)

Slidethe

lower

edge

ofthe

chassis

into

the

power

cable

holder

case

whilstslidingthe

upperedge

ofthe

board

into

the

chassis

holding

rib.

For

the

14”

model

a)

Slidethe

lower

edge

ofthe

chassis

into

the

power

cable

holder

case

whilstsliding

the

upperedge

ofthe

board

intothe

chassis

holding

rib.

After

servicing

ensure

all

wiring

is

returned

to

its

original

position

before

returning

the

receiver

to

the

customer.

21S1

SERIES

14S1

SERIES

Chassis

Holding

Rib

E

PC.B.

Power

cable

Rail

holder

case

iX=2151

1/1

C-2151R_

|

CGC

CS

ADJUSTMENTS

ITEM/PREPARATION

ADJUSTMENT

PROCEDURE

BVOEIACE

1.

Confirm

the

indicated

test

points

for

the

specified

voltage.

1.

Operate

the

TV

set.

2.

Set

controls

:

21S1

Series

14S1

Series

Bright

(R318)

minimum

TPE

13:1245V

+

1.5V

103V.

+

1.5V

Beam

Current

TPE

11:

31V

+

2Vv

27.0V

+

2V

TPE

1:

WW

+

1V

11V

ct

1V

TPE6:

28.0V

4+

£1.5V

26.7V

+

1.5V

TPE9:

23.0V

+

1.0V

23.3V

+

1.0V

TPE

4:

163V

4

=

1.0V

16.0V

+

1.0V

TPE5:

12.0V

+

1.0V

12.0V

+

1.0V

TPE

3:

8.0V

+

1.0V

8.0V

+

1.0V

TPE

2:

5.0V

+

0.3V

5.0V

cz

(0.8V

TPE14:

30V

+

2.5V

30V

+

2.5V

1.

Apply

39.5

Mhz

continuous

wave

to

TPE54

(IF

of

Tuner)

AFC

(0.5Vp—p/75Q)

2.

Adjust

L104

so

that

voltage

at

TPE27

becomes

2.5+0.1V.

1.

Operate

the

TV

set.

3.

Change

the

frequency

and

confirm

the

voltage

as

shown

below.

2.

Connect

a

DVM

to

TPES8.

+

100kHz:

Less

than

1.0V

—

100kHz:

more

than

4.0V

1.

Turn

RF

AGC

conirol

R109

fully

counterclockwise.

RF

AGC

2.

Slowly

turn

RF

AGC

control

clockwise

to

set

it

at

the

point

just

before

voltage

at

TPE28

starts

to

fall.

1.

Receive

the

Philips

pattern.

2.

Set

the

input

level

to

60

+

2

dB

(75Q

open).

3.

Connect

an

oscilloscope

to

TPE59

(RF

AGC

terminal).

1.

Connect

a

high

voltage

meter

(Electrostatic

type)

to

an

anode

of

the

picture

tube.

2.

Confirm

that

the

high

voltage

is

within

a

range

of

1.

Receive

a

crosshatch

pattern.

21S1

Series

14S1

Series

HIGH

VOLTAGE

2.

Set

Contrast,

Bright

and

Sub—Bright

controls

to

their

26.4Kv+1.5kV

21.5Kv

+

1.5kV.

minimum

positions

(Zero

beam

current).

|

-TX-2151

1/1

C-21S

7h

LT

X—14517/1

C-14515

ADJUSTMENTS

SUB

NTRAST

:

i

Adjust

Sub

brightness

(R306)

to

set

Adjust

R316

1.

Receive

a

Philips

pattern.

fhe

Blaciclevel

16

ON.

2.8V+/-0.1V—p

(Input

level

75dB).

.

Adjust

the

Sub

contrast

(R316)

to

set

Connect

an

oscilloscope

to

the

drive

voltage

to

2.8V+/—

0.1V—p.

TPY1.

Set

controls

to

:

Brightness

minimum

Contrast

maximum

Colour

minimum

~~

Adjust

(R306)

4

Sharpness

centre

Pix

minimum

Fig.5

SUB

COLOUR

1.6Vp—p

+/—

0.1V

Connect

a

short

jumper

between

TPE6

and

earth.

Adjust

the

sub

colour

(R607)

for

1.

Receive

a

PAL

colour

bar

pattern.

2.

Set

controls

to:

Brightness

minimum

1.6Vp—p

+/—

0.1V

at

TPE15

as

shown

in

Fig.6.

Contrast

maximum

Sub

colour

eanire

Remove

the

earth

jumper

wire.

Colour

centre

Sharpness

minimum

.

Connect

an

oscilloscope

to

TPE15.

TEXT

CONTRAST

1.

Receive

a

teletext

signal.

1.

Adjust

R3515

to

check

the

maximum

level

>

1.5v

and

a

minimum

level

<

0.6v.

2.

Connect

an

oscilloscope

T2

5.

2.

.

Adjust

R3515

to

centre.

(pk

—

pk

*)

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SCHEMATIC

DIAGRAM

FOR

MODELS

TX—21S1T

/

TX-21S1R

/

TX-14S1T

/

TC-14S1R

(Z—5

CHASSIS)

IMPORTANT

SAFETY

NOTICE

Components

identified

by

/\

mark

have

special

characteristics

en

eee

ae

pees

ae

og

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rent

sen

comsonss

important

for

safety.

When

replacing

any

of

inese

componenis,

use

only

manufacturer's

specified

parts.

1.

RESISTOR

7.

=>

Indicates

the

Video

signal

path

6

All

resistors

are

carbon

%4W

resistor,

unless

marked.

Die=B)

.Qi2-B4

4

TPi7

Tes

Unit

of

resistance

is

OHM

(@)

(K=1,000,

M=1,000,000).

<5

__

indicates

the

Audio

signal

path

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ella

sia

oO

=

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Xx

a

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|

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as

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Wire

Wound

A

:

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8.

This

schematic

diagram

is

the

latest

at

the

time

of

printing

DIs—C2

pacasicd,

|

me

‘ge

°:

7

2

CAPACITOR

and

is

subject

to

change

without

notice.

DO8—C2

ICO6—B2

All

capacitors

are

ceramic

50V

capacitors,

unless

marked

Remarks:

D10—-c2

1C3502—B2

ce

as

follows:

6:

\Fara=

pa

Gog2

63

5.

Unit

of

capacitance

is

yF,

unless

otherwise

stated.

1.

Care

must

be

taken

when

servicing

this

receiver,

as

it

uses

[o11-D4_[icos—c3

‘3.

.

~”

:

Temprature

Compensation

@)

:

Polyester

a

HOT

chassis.

The

circuit

is

defined

by

HOT

and

COLD

Nas

octal

1C3501—C4

4ch8

—

indications

in

the

schematic

diagram.

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the

following

=a

1c04—D5

;

2

Roe

am:

:

Polypropylene

@)

:

Dipped

Tantalum

precautions.

All

circuits

except

the

Audio,

Video

input

=

e.

NP

.r

circuits

are

HOT.

rr

Slama

ie

ty-

:

Electrolytic

—-

:

Bipolar

“THO

ict

,

2.

Precautions

°

@)

:

Metallised

Polyester

@

_

:z-1pe

a.

Do

not

touch

the

hot

part,

or

the

hot

and

cold

parts

of

the

3

COIL

chassis,

at

the

same

time,

as

you

are

liable

to

a

shock

4

Unit

of

inductance

is

nH,

unless

otherwise

stated.

nee

b.

Do

not

short—circuit

the

hot

and

cold

circuits

as

electrical

4.

TEST

POINT

°

Test

Point

position

{Pevetorm

Test

Point

position

components

may

be

damaged.

c.

Donotconnect

an

instrument,

such

as

an

oscilloscope,

to

Z

yeas

eats

a

Id

Line

Earth

(Hot

the

hotand

cold

circuits

simultaneously,

as

this

may

cause

=|

assis

Earth

(Cold)

|

Line

Earth

(Hot)

fuse

failure.

Connect

the

earth

of

the

instruments

to

the

6.

VOLTAGE

MEASUREMENT

earth

connection

of

the

circuit

being

measured.

ae

ies

diisaplar

inlay

DG

voltmeter.

Measurement

d.

Make

sure

to

disconnect

the

power

plug

before

removing

Power

source

............05-

AC

220

/

240V,

50Hz

Mena:

3

=

Receiving

Signal

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

Colour

Bar

signal

(RF)

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No

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the

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Parts

list

|

X-21511/1C-2151h

4S

7h

26

27

NOTE

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mechanical

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Parts

list

PARTS

LOCATION

FOR

TX-14S1T

/

TC-14S1R

WIM

‘

TT,

Panasonic TX-21S1T User manual

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