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

50Hz.

58W

TX—21S1T

TC—21S1R

39W

TX-1451T

TC—14S1R

Power

Consumption

Aerial

impedance

75Q

unbalanced,

Coaxial

Type

Receiving

System

PAL

—

(UHF)

PAL

—

Receiving

Channels

UHF

E21

—

E69

Intermediate

Frequency

Video

39.5

MHz

Sound

33.5

MHz

Colour

35.07

MHz

PAL

Video/Audio

Terminals

AV1

Video

(21

pin)

1Vp—p

75Q

Audio

(21

pin)

500mVrms

10kQ

RGB

(21

pin)

AV1

OUT

Video

(21

pin)

Vp—p

75Q

Audio

(21

pin)

500

rms1kQ

RCA

Video

Vp—p

752

RCA

Audio

500

mVrms,

10KQ

ORDER

NO.

SM-—94001

A51EAL55X13

90°

measured

diagonally

A34EAC01X13

90°

measured

diagonally.

Picture

Tube

Audio

Output

Watt

8Q,

Rectangular

Remote

Control

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

change

without

notice.

Weight

and

dimensions

shown

are

approximate.

IMPORTANT

This

receiver

uses

HOT

chassis,

after

service

please

ensure

that

the

chassis

returned

its

correct

position.

Particular

care

being

taken

the

position

the

customer

controls.

Failure

could

endanger

customer

safety.

Panasonic

(U.K.)

LTD.

WILLOUGHBY

ROAD,

BRACKNELL,

BERKS,

RG12

8FT.

BX—21511/1C-21351R

VELSMeSs

Contents

Safety

Precautions

......

Fed

diode

act

tected

Met

rutes

Dats

Location

Controls

0.2...

...

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SENWICE-

POSTION

v.30.

hee

cohenteys

bade

ies

Cass

Adjustment

Procedure

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

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Block:

Diagrams:

sseces

wed

Sats

eatice

ete

whee

Seen

Conductor

VIEWS

.......

0.0

ccc

cece

een

teen

eeeanes

Schematic

DiagraMs

.........

0...

eee

cece

eee

Exploded

VIOWS

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Parts

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eee

Safety

Precautions

General

Guide

Lines

advisable

insert

isolation

transformer

the

supply

before

servicing

hot

chassis.

When

servicing,

observe

the

original

lead

dress

the

high

voltage

circuits.

short

circuit

found,

replace

all

parts

which

have

been

overheated

damaged

the

short

circuit.

After

servicing,

see

that

all

the

protective

devices

such

insulation

barriers,

insulation

papers,

shields

and

isolation

R—C

combinations

are

correctly

installed.

When

the

receiver

not

being

used

for

long

period

time,

unplug

the

power

cord

from

the

outlet.

Potentials

high

26.4Kv

are

present

when

this

receiver

operation.

Operation

the

receiver

without

the

rear

cover

involves

the

danger

shock

hazard

from

the

receiver

power

supply.

Servicing

should

not

attempted

anyone

who

not

familiar

with

the

precautions

necessary

when

working

.on

high

voltage

equipment.

Always

discharge

the

anode

the

picture

the

chassis

before

handling

the

tube.

After

servicing

make

the

following

leakage

current

checks

prevent

the

customer

from

being

exposed

shock

hazards.

Leakage

Current

Cold

Check

Unplug

the

cord

andconnect

ajumper

between

thetwo

prongs

the

plug.

Turn

the

receiver's

power

switch.

Measure

the

resistance

value

with

ohmmeter,

between

the

jumpered

plug

and

each

exposed

metallic

cabinet

part

the

receiver,

such

screw

heads,

aerials

connectors,

control

shafts

etc.

When

the

exposed

metallic

part

has

return

path

the

chassis

the

reading

should

between

and

20M

When

the

exposed

metal

does

not

have

return

path

the

chassis

the

reading

must

infinite.

Leakage

Current

Hot

Check

Plug

the

cord

directly

into

the

outlet.

not

use

isolation

transformer

for

this

check.

Connect

ohm 10W

resistor

series

with

exposed

metallic

part

the

receiver

and

earth

such

water

pipe.

Use

voltmeter

with

high

impedance

measure

the

potential

across

the

resistor.

Check

each

exposed

Metallic

partand

check

the

voltage

each

point.

Reverse

the

plug

the

outlet

and

repeat

each

the

above

measurements.

The

potential

any

point

should

not

exceed

1.4

Vrms.

case

ameasurementis

outside

the

limits

specified,

there

possibility

shock

hazard,

and

the

receiver

should

repaired

and

rechecked

before

returned

the

customer.

HOT

CHECK

CIRCUIT

A.C.

Voltmeter

Water

Pipe

Instrument’s

(Earth)

exposed

metallic

parts

ohm

10W

Fig.1

X—Radiation

Warning

The

potential

sources

X—Radiation

sets

are

the

high

voltage

section

and

the

picture

tube.

Whenusingapicture

tube

testjig

for

service

ensure

thatthe

jig

capable

handling

28.0

kV(21S1

Series)

and

23kV

(14S1

Series)

without

causing

X—

Radiation.

NOTE

itis

important

use

accurate

periodically

calibrated

high

voltage

meter

Set

the

brightness

minimum.

Measure

the

high

voltage.

The

meter

should

indicate:—

26.4Kv

1.5

(2181

Series)

21.5Kv

1.5

(1481

Series)

ifthe

meterindicationis

out

oftolerance,

immediate

service

and

correction

required

prevent

the

possibility

premature

component

failure.

prevent

X—Radiation

possibility,

itis

essential

use

the

specified

tube.

TX-21811/1C-2151F

SLSSALSESSI:

SHUT

DOWN

CIRCUIT

TEST

This

test

must

made

final

check

before

the

set

returned

the

customer.

Receive

the

Phillips

pattern.

Check

that

the

shut-down

circuit

functions

when

—60V

applied

TPE40,

but

does

not

function

when

—40V

applied.

Location

Controls

RED

CUTOFF

R364

GREEN

DRIVE

R357

GREEN

CUTOFF

R362

RED

DRIVE

R358

BLUE

CUTOFF

R369

H.WIDTH

L552

SUB

GLR

R607

TEXT

CONTRAST

CENT

R502

R3515

R.FAGC

R109

CENTRE

$451

SERVICE

SWITCH

$301

SUB

CONT

SUB

BRT

HEIGHT

R465

Fig.

R316

(R306)

How

move

the

chassis

into

the

Service

position

Hold

and

lift

the

rear

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,

Place

the

lower

edge

the

chassis

against

the

’L’

shaped

stopper

located

the

chassis

rail

whilst

sliding

the

upper

edge

the

board

into

the

chassis

holding

rib.

Slidethe

lower

edge

ofthe

chassis

into

the

power

cable

holder

case

whilstslidingthe

upperedge

ofthe

board

into

the

chassis

holding

rib.

For

the

14”

model

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

returned

its

original

position

before

returning

the

receiver

the

customer.

21S1

SERIES

14S1

SERIES

Chassis

Holding

Rib

PC.B.

Power

cable

Rail

holder

case

iX=2151

1/1

C-2151R_

CGC

ADJUSTMENTS

ITEM/PREPARATION

ADJUSTMENT

PROCEDURE

BVOEIACE

Confirm

the

indicated

test

points

for

the

specified

voltage.

Operate

the

set.

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

TPE

11V

TPE6:

28.0V

£1.5V

26.7V

1.5V

TPE9:

23.0V

1.0V

23.3V

1.0V

TPE

163V

1.0V

16.0V

1.0V

TPE5:

12.0V

1.0V

12.0V

1.0V

TPE

8.0V

1.0V

8.0V

1.0V

TPE

5.0V

0.3V

5.0V

(0.8V

TPE14:

30V

2.5V

30V

2.5V

Apply

39.5

Mhz

continuous

wave

TPE54

(IF

Tuner)

AFC

(0.5Vp—p/75Q)

Adjust

L104

that

voltage

TPE27

becomes

2.5+0.1V.

Operate

the

set.

Change

the

frequency

and

confirm

the

voltage

shown

below.

Connect

DVM

TPES8.

100kHz:

Less

than

1.0V

—

100kHz:

than

4.0V

Turn

AGC

conirol

R109

fully

counterclockwise.

AGC

Slowly

turn

AGC

control

clockwise

set

the

point

just

before

voltage

TPE28

starts

fall.

Receive

the

Philips

pattern.

Set

the

input

level

(75Q

open).

Connect

oscilloscope

TPE59

(RF

AGC

terminal).

Connect

high

voltage

meter

(Electrostatic

type)

anode

the

picture

tube.

Confirm

that

the

high

voltage

within

range

Receive

crosshatch

pattern.

21S1

Series

14S1

Series

HIGH

VOLTAGE

Set

Contrast,

Bright

and

Sub—Bright

controls

their

26.4Kv+1.5kV

21.5Kv

1.5kV.

minimum

positions

(Zero

beam

current).

-TX-2151

1/1

C-21S

X—14517/1

C-14515

ADJUSTMENTS

SUB

NTRAST

Adjust

Sub

brightness

(R306)

set

Adjust

R316

Receive

Philips

pattern.

fhe

Blaciclevel

ON.

2.8V+/-0.1V—p

(Input

level

75dB).

Adjust

the

Sub

contrast

(R316)

set

Connect

oscilloscope

the

drive

voltage

2.8V+/—

0.1V—p.

TPY1.

Set

controls

Brightness

minimum

Contrast

maximum

Colour

minimum

Adjust

(R306)

Sharpness

centre

Pix

minimum

Fig.5

SUB

COLOUR

1.6Vp—p

+/—

0.1V

Connect

short

jumper

between

TPE6

and

earth.

Adjust

the

sub

colour

(R607)

for

Receive

PAL

colour

bar

pattern.

Set

controls

to:

Brightness

minimum

1.6Vp—p

+/—

0.1V

TPE15

shown

Fig.6.

Contrast

maximum

Sub

colour

eanire

Remove

the

earth

jumper

wire.

Colour

centre

Sharpness

minimum

Connect

oscilloscope

TPE15.

TEXT

CONTRAST

Receive

teletext

signal.

Adjust

R3515

check

the

maximum

level

1.5v

and

minimum

level

0.6v.

Connect

oscilloscope

Adjust

R3515

centre.

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