Panasonic TX-29A3E Manuale utente

ORDER

NO.

SM—93026

‘Service

Manual

Specifications

(Information

brackets

refer

TX—25A3E

)

230

AC,

50Hz

115W

(

105W

)

75Q

unbalanced,

Coaxial

Type

PAL—

B,G

Power

Source

Power

Consumption

Aerial

Impedance

Receiving

System

Receiving

Channels

VHF

E2-

£12

VHF

—

(ITALY)

CATV

(S01

—

S05)

VHF

—

(ITALY)

UHF

E21

E69

CATV

—

S10

(M1—M10)

CATV

S11

—

S20

(U1—U10)

CATV

S21

—

S41

(HYPERBAND)

Intermediate

Frequency

Video

Audio

Terminals

AV1

OUT

AV2

OUT

AV3

AV4

38.9

MHz

Sound

33.4

MHz

Colour

34.47

MHz

(PAL)

Video

(21

pin)

Audio

(21

pin)

Vp—p

752

500mV

rms,10kQ

RGB

(21

pin)

Video

(21

pin)

1Vp—p

75Q

Audio

(21

pin)

500mV

rms,

1kQ

Video

(21

pin)

1Vp—p

75Q

Audio

(21

pin)

500mVrms,10

S-Video

Y:1Vp—p

75Q

(21

pin)

C:0.3

Vp—p

75Q

Video

(21

pin)

Vp—p

75Q

Audio

(21

pin)

500mVrms,10

Selectable

output

(21

pin)

S-Video

Y:1Vp—p

(4—pin

)

C:0.3

Vp—p

752

Audio

(RCA

500mV

rms,10kQ

S-Video

Y:1Vp—p

75Q

(4—pin

)

C:0.3

Vp—p

75Q

Audio

(RCA

500mV

rms,10kQ

Video

(RCAx1)

Vp—p

752

‘Panasonic

Colour

Television

TX—29A3E

TX—25A3E

EURO—1

Chassis

High

Voltage

Picture

Tube

Audio

Output

Internal

Speaker

External

Speaker

Speakers

Headphones

Accessories

supplied

Dimensions

Net

Weight

29.7kV

(29.0

kV)

zero

beam

current

72cm

68cmV

(63cm

cmvV

)

Super

Flat

FST

110°

measured

diagonally.

(Music

Power)

Impedance

(Music

Power)

—

Impedance

9cm

round

(Woofer)

4cm

7cm

oval

(Tweeter)

Impedance

Remote

Control

UMS

Battery

Height

558mm

(509mm)

Width

668mm

(606mm)

Depth

503mm

(482mm)

41.5kg

(31kg)

Specifications

are

subject

change

without

notice.

Weight

and

dimensions

shown

are

approximate.

NOTE

This

service

manual

should

used

conjunction

with

the

EURO

service

guide.

TX-29A3E

TX-25A3E

Contents

Safety

Precautions

+...

6.6.6...

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teen

eee

Location

Controls

......

eee

Chassis

Service

Position.

.....6...-..00ecceeeeeee

reese

eee

ees

Adjustment

Procedure

...........

esse

cere

tence

eee

Alignment

Procedure

teieee's

beeen

eee

nett

eee

Self

Check

.....

Prth

tiMtins

Naini

0%.

seat

artes

ogiichatnlend

eeiete

gheskeiier

eos

Block

Diagrams

..........

cece

eee

teen

ener

eens

Conductor

ViewS

......

0.00.

cece

eee

terete

teen

nee

eenes

Schematic

Diagrams

Seen

ante

ath

hea

ton

Siete

aie

SaSad

Exploded

Views

........

datertnec

Shee

ated

teh

ihetdd

aoe

ties

Parts

List

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

ache

tots

Bid

srraue

Grete

aovibipn

ares

weg

ayet

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

31.0

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

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

Unplugthe

cord

and

connect ajumper

between

the

two

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

ohm

and

20M

ohm.

When

the

exposed

metal

doesnot

have

areturn

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

part

and

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,

thereis

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

setsare

the

high

voltage

section

and

the

picture

tube.

Whenusing

picture

tube

testjig

for

service

ensurethatthe

jig

capable

handling

31.0kV

without

causing

X—Radiation.

NOTE

important

use

accurate

periodically

caitprated

high

voltage

meter

Set

the

brightness

minimum.

Measure

the

high

voltage.

The

meter

should

ndicate

29.7kV

+/—

0.7kV

(29

.OkV

+/—

0.7

KV,

for

TX—2A\3E)

the

meter

indication

out

tolerance,

immediates

ervice

and

correction

required

prevent

the

possbility

premature

component

failure.

prevent

X—

Radiation

possibility,

itis

essenta|

use

the

specified

tube.

—

TX-29A3E

TX-25A3E

Location

Controls

SCREEN

(P3362)

Fig.2

Service

Hints

How

remove

the

rear

cover

Remove

the

fixing

screws

(A)

shown

Fig.3/Fig.4.

CTT

TITS

TTT

Tae

HELO

SCREWS

(A)

Fig.3.

TX-29A3E

TX-25A3E

How

move

the

chassis

into

the

Service

position

Hold

and

lift

the

rear

the

E—

PCB

chassis

shown

fig.5.

and

gently

pull

the

chassis

toward

you.

Release

the

respective

wiring

clips

and

turn

the

chassis

through

90°,

counter—clockwise,

shown

fig.6.

Clip

the

chassis

onto

the

support

bracket

(B)

shown

fig.6

and

fig.7.

After

servicing

ensure

all

wiring

returned

its

original

position

before

returning

the

receiver

the

customer.

(ho

SUPPORT

BRACKET

(B)

SUPPORT

BRACKET

(B)

0000000%000000

CHASSIS

BRACKET

Fig.7.

Fig.6.

TX-29A3E

TX-25A3E

HOW

MOVE

THE

CONTROL

PANEL,

AND

PCB

BOARDS

Place

the

board

into

the

service

position

shown

page

Remove

the

three

screws

(C)

(Fig.8)

from

the

front

the

chassis.

Lift

the

two

plastic

clips

(D)

(Fig.9)

and

pull

the

chassis

horizontally

outwards,

making

sure

leads

are

stressed.

ced

eta

After

servicing

ensure

all

wiring

returned

its

origina!

position

before

returning

the

receiver

the

customer.

SCREWS

(C)

Fig.8.

<)>

Fig.9

Plastic

clip

(D)

‘TX-29A3E

TX-25A3E

Service

position

for

the

A—Board

Remove

the

A—board

from

the:

main

chassis

(E—board),

ensuring

all

leads

are

disconnected.

Remove

the

two

screws

(E)

(fig.10)

from

the

plastic

cover

and

unclip

the

cover

from

the

A—board.

Remove

the

three

metal

clips

(F)

(Fig.1

from

the

metal

cover.

Unclip

the

plastic

clips

each

corner

the

front

metal

cover

(fig.11)

and

remove

from

the

A-board

(fig.12).

the

same

for

the

rear

metal

cover

(fig.13).

Fit

the

extension

leads

the

A—board

making

sure

that

the

A—board

does

not

touch

the

E—board

(fig.14).

After

servicing

ensure

all

wiring

returned

its

original

position

before

returning

the

receiver

the

customer.

Note

The

extension

lead

wire

kit

supplied

service

kit.

(Part

number

TZS2EK025).

Plastic

clip

Metal

clips

(F)

Board

Sits

-—

TX-29A3E

TX-25A3E

Adjustment

Procedure

ettings/Specia

features

Measure

Cathode

D651

Voltmeter

shows

past

Pees

+150V-£0.5(TX-29A3E

+147V+0.5V).

Place

oscilloscope

Pilot

fitter

54.7KHZ|

probe

Adjust

P1321

Max.

amplitude

ones

1C1301

(ACP2371)

Place

oscilloscope

The

oscilloscope

trace

Sana

calor

“Bar

probe

pin-

must

show

1.80V

p-p.

IC1601

(SAD2140).

0.05V

Slowly

turn

P4703

anti—

clockwise,

set

P4703

where

the

AGC

volt-

age

drops

0.2V

from

the

maximum.

230

50Hz

—

beam

Operating

voltage

Enicere

Test

pattern

Video

Input

Level

Adjust

P1227.

Receive

standard

Colour

Bar

Signal,

60dB

(75Q)

42dB.

Placeanoscilloscopeon

tuner

AGC

Adjust

P4703

clockwise

The

remote

control

used

for

entering

and

storing

adjustments,

with

the

exception

cut—off

adjustments

which

must

always

done

prior

service

adjustment.

Perform

adjustments

accordance

with

screen

display.

The

display

the

screen

also

specifies

the

CCU

variants

wellas

the

approx.

setting

values.

Before

you

enter

the

service

mode,

set

contrastto

step

and

brightness

step

andstore

each

these

values.

The

adjustment

sequence

for

the

service

mode

indicated

below.

Set

the

Bass

maximum

position,

set

the

Treble

Press

the

YELLOW

BLUE

buttons

alter

the

function

minimum

position,

press

the

Volume

down

the

values.

customer

controls

atthe

front

ofthe

and

atthe

sametime

Press

the

STORE

button

the

preset

panel

after

each

press

the

Reset

button

onthe

remote

control,

this

will

place

the

into

the

Service

Mode.

Press

the

RED

GREEN

buttons

step

down

through

the

functions.

NOTE:

This

also

has

the

option

using

Memory

Pack

which

enables

you

copy

the

preset

channels

and

analogue

levels

into

the

Memory

Pack

and

then

upload

them

onto

another

EURO—1

set.

adjustment

has

been

made

store

the

required

values.

exit

the

Service

Mode

switch

off

the

TV.

Memory

Pack

process

Memory

Pack

Process

Plug

the

memory

pack

into

the

lower

the

two

ale

Piug

the

memory

pack

into

the

lower

the

two

terminals

the

back

the

and

switch

the

on.

the

terminals

the

back

the

and

switch

the

on.

the

has

only

one

connector

then

this

will

able

has

only

one

connector

then

this

will

able

the

memory

pack.

the

memory

pack.

into

the

Service

Mode

explained

above.

The

screen

into

the

Service

Mode

explained

above.

The

screen

will

show:

—

will

show:

—

Program

External>

>TV

External>>TV

Press

the

blue

button

ontheremote

control.

Thescreen

will

Press

the

STORE

button

the

TV.

The

screen

will

show:

—

show:

—

Program

Press

the

STORE

button

the

TV.

The

screen

will

All

the

tuning

information

stored

inside

the

Memory

Pack

show:

—

will

now

transferred

the

TV.

This

process

will

take

2—3

minutes

complete

and

when

finished

the

screen

will

Storing

show:—

All

the

tuning

information

stored

inside

the

will

now

OK!

transferred

the

Memory

Pack.

This

process

willtake

2—3

minutes

complete

and

when

finished

the

screen

will

The

tuning

information

from

the

Memory

Pack

has

now

show:

—

been

copied

into

the

OK!

exit

from

the

Service

Mode

switch

off

the

TV.

The

process

has

now

been

completed

and

the

Memory

Pack

can

now

removed.

Errors

error

occurs

while

using

the

Memory

Pack

the

will

detect

this

and

the

screen

will

show:

—

Program

Error!

this

happens

then

switch

off

the

and

then

repeat

the

process

that

was

being

used.

the

errors

continue

occur

then

check

the

connectors

between

the

and

the

memory

pack

and

check

the

battery

inside

the

memory

pack.

TX-29A3E

TX-25A3E

Alignment

Settings

(TX—29A3E)

Alignment

Function

Settings

Special

features

V—AMP

Amplitude

154

V—SYM

Symmetry

018

Vertical

amplitude:

Vertical

symmetry

Vertical

linearity

Optimum

setting

Horizontal

amplitude

Horizontal

position

EW-amplitude

EW-—amplitude

Trapezium—comp

Position

002

E—W-—AMP

EW—Ampl.1

106

E—-W-AMP

EW-—Amp.2

037

TRAPEZ-1

Trapezi

144

TRAPEZ—2

Trapez2

034

SW-OVER—1

SW-Over—1

028

SW-OVER-2

SW-Over-—2

155

Y—DELAY

Y—Delay

011

COLOUR-VCO

Colour

VCO

033

Optimum

setting

Optimum

setting

Trapezium~—

comp

10.

Switch—-over

point

11.

Switch—-over

point

12.

Y—delay

13.

Sub—carrier

osc.

adjustment

15.

Low

light

16.

High

light

adjust

the

screen

settings.

Turn

P3362

minimum,

place

oscilloscope

probe

the

cathode

with

the

highest

output

and

adjust

P3368

the

oscilloscope

trace

reads

160V-L5V

then

turn

P3362

the

high-

est

numbered

box

the

screen

reads

040

010.

SCREEN

Press

the

GREEN

button

step

through

the

settings.

Adjust

for

optimum.

Press

the

GREEN

button

step

through

the

settings_

Adjust

for

optimum.

Alignment

Settings

(TX—25A3E)

Alignment

Function

V—AMP

Amplitude

150

Vertical

symmetry

Symmetry

024

V—LIN

Vertical

linearity

Linearity

021

H-AMP

Amplitude

067

H-—POS

Position

002

E—W-—AMP

EW~amplitude

048

EW-—Amp!.1

048

EW-amplitude

Trapezium—comp

Vertical

amplitude

Horizontal

amplitude

Horizontal

position

—Ampl.2

044

TRAPEZ—1

Trapez

060

TRAPEZ—2

Trapez

056

Trapezium—

comp

SW-OVER—1

SW-Over

024

SW-OVER-2

11.

Switch—over

point

142

SW-Over

142

12.

Y—-delay

10.

Switch—over

point

Y—DELAY

Y—Delay

010

Colour—VCO

Colour

VCO

043

13.

Sub—carrier

osc.

adjustment

SCREEN

14.

Screen

LOW

LIGHT

15.

Low

light

054

053

HIGH

LIGHT.

TX-29A3E

TX-25A3E

Settings

Special

features

Optimum

setting

Optimum

setting

Optimum

setting

not

adjust

Optimum

setting

Set

frequency

adjust

the

screen

settings.

Turn

P3362

ninimum,

place

oscilloscope

probe

the

cathode

vith

the

highest

output

and

adjust

P3368

the

oscillsscope

trace

reads

170V-L5V

then

turn

P3362

the

high-

est

numbered

box

the

screen

reads

04)

010.

Press

the

GREEN

button

step

through

the

settings.

Adjust

for

optimum.

Press

the

GREEN

button

step

through

the

settings.

Adjust

for

optimum.

}

TX-29A3E

TX-25A3E

SELF

CHECK

Self

check

used

automatically

check

the

Bus

lines

and

Hexadecimal

code

the

set.

enter

the

Self

Check

mode

press

Volume

down

button,

onthe

Preset

Panel,

atthe

sametime

pressing

the

Off

Timer

button,

onthe

Remote

Control,

and

the

screen

will

show:

—

the

CCU

ports

have

been

checked

and

found

incorrect

then

Reset

Analogue

Values

After

exiting

from

the

Self

Check

mode

the

set

will

have

reset

the

EEPROM

the

values

descibed

below:

—

ReCallicccc

sink

dect

Gate

seen

hee

Off

Last

programme

.........-...-2-05-

Music

Speech

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

Music

LASTAV.

sista

wae

eek

teeta

eae

AV1

Sound

Multi

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

eee eee

Stereo,

Balance

.......--ccceeeeee

ere

cceee

Centre

Warm-Up

.......

cece

creer

renee

Reset

Programme

data

(0-99)

...........

AFG®

2.05

s33

050

sebsacdg

SuSardta

RSENS

belo

ale

tale

acteele

wich

Colour

Sys

Auto

leer

ance

icrechdiesea

ead

itet

OAS

eee

Fine

Tune

...

Centre

Sets

normal

levels

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

Volume

ileiee

wunataea

GATE

tiaras

ate

gianna

Bass

eee

Treble

Sivleodvete

hee

atal

wre

mibeecee.e

eeleo

sea

ees

Cojour

ica

Sail

Bed

ates

ies

Seana

Seen

SteNes

ebi

Brightness

scartate

Rusia

aera

uneceh

oie

Sars

HED

ode

Tint

Rig

deta

tcecauh

Sgone,

aoe

tthe

ewe

tee

Contrast

GSES

Aen

ash

alidtg

Wine

ese

saan

iar

ede

ehel's

Sharpness

Tuner

SCL1

Key

Scan

VIE

scL2

Fast

Blanking

Priority

EEPROM

SHU

Service

Mode

Sound

SDA

switch1

RAM

Sound

switch2

Video

switching

switch

Video

switch2

switching

Sat

tuner

Reset

TPU

Hex

codes

bus1

Reset

APU

bus2

Stand

LED

——”

will

appear

place

"OK".

Fixed

Mode

Operation

This

will

reset

the

following

listed

settings

and

systems

assist

fault—finding

and

servicing

the

set.

Use

the

Service

Remote

Control

(Part

No.

TZS2EK004)

enter

the

fixed

mode

operation

follows.

Press

the

Service

button,

located

between

the

Off

Timer

and

Audio

Out

buttons,

plus

one

ofthe

following

numeric

keys

select

the

desired

system

and

listed

functions:

—

Warsi

elena

sabe?

hee

eRe

Fixed

data

PAL

Dis

scascolteck

lane:

ehentdeincoase

tela

tatasy

agave

coasts

Fixed

data

SECAM

heres

REN

adage

eee

Se5.sed

Fixed

data

M~NTSC

iiccol

Avie

oare

noi

aieraca

ame

ages

Fixed

data

NTSC

Fixed

Data

POWeF:

occ

ice

debate

aed

ING

cad

iasishd

hada

eeaaw

aes

(AV1)

COlOUI

i.c00s

tod

cath

ood

orbier

Mid

Brightness

..................00008.

Mid

Contrast:

\.ciswed

sta

decets

eta

das

Max

Sharpness

........

edeatnd-adeie

ate

toate

Mid

MOde::sssccdces

ces

saerce

vee

Off

RGB

Interrupt

..................2.0.

Off

Text

Processor

................0-85

OSD:

Ssecdcinid

oie

sends

tanta

Off

VOIUME

2...

cece

eee

cette

eee

Position

steps

Balance:

.3.0c

none

Pen

ewe

lane

Centre

BASS

iio.

8b es

Siete

ogee

eaten

Centre

Wreble

wiisnews

dhaweeet

eee

hiss

Centre

Music

Speech

.................4.

Music

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