Panasonic TX-29A3E User manual

ORDER NO. SM—93026
‘Service
Manual
Specifications
(Information
in
brackets
refer
to
TX—25A3E
)
230 V 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 A — H (ITALY)
CATV (S01 — S05)
VHF H1 — H2 (ITALY)
UHF E21 ~ E69
CATV S1 — S10 (M1—M10)
CATV
S11
—
S20
(U1—U10)
CATV
S21
—
S41
(HYPERBAND)
Intermediate Frequency : Video
_ Video / Audio
Terminals :
AV1 IN
AV1 OUT
AV2 IN
AV2 OUT
AV3 IN
AV4 IN
38.9 MHz
Sound 33.4 MHz
Colour 34.47 MHz (PAL)
Video (21 pin)
Audio (21 pin)
1 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 kQ
S-Video IN Y:1Vp—p 75Q
(21 pin) C:0.3 Vp—p 75Q
Video (21 pin) 1 Vp—p 75Q
Audio (21 pin) 500mVrms,10 kQ
Selectable output (21 pin)
S-Video IN Y:1Vp—p 75
(4—pin ) C:0.3 Vp—p 752
Audio (RCA x 2) 500mV rms,10kQ
S-Video IN Y:1Vp—p 75Q
(4—pin ) C:0.3 Vp—p 75Q
Audio (RCA x 2) 500mV rms,10kQ
Video (RCAx1) 1 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) at zero beam
current
72cm 68cmV (63cm 59 cmvV ) Super
Flat FST 110° measured diagonally.
2x 10 W (Music Power)
8Q Impedance
2 x 20 W (Music Power)
4 — 8Q Impedance
2 x 9cm round (Woofer)
2x 4cm x 7cm oval (Tweeter)
1x 8 Q Impedance
Remote Control
UMS Battery
Height : 558mm (509mm)
Width : 668mm (606mm)
Depth : 503mm (482mm)
41.5kg (31kg)
Specifications are subject to change without notice.
Weight and dimensions shown are approximate.
NOTE
:
This
service
manual
should
be
used
in
conjunction
with
the
EURO
1
service
guide.

TX-29A3E
TX-25A3E
Contents
Safety
Precautions
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Location
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Controls
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Service
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Procedure
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Alignment
Procedure
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Self
Check
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Diagrams
..........
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Conductor
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Schematic
Diagrams
Seen
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Siete
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Views
........
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datertnec
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Parts
List
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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
31.0
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.
Unplugthe
AC
cord
and
connect ajumper
between
the
two
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
ohm
and
20M
ohm.
When
the
exposed
metal
doesnot
have
areturn
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 part and 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, thereis
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 setsare the
high voltage section and the picture tube.
2. Whenusing a picture tube testjig for service ensurethatthe
jig is capable of handling 31.0kV without causing
X—Radiation.
NOTE : it is important to use an accurate periodically caitprated
high voltage meter
Set the brightness to minimum.
2. Measure the high voltage. The meter should ndicate
29.7kV +/— 0.7kV (29 .OkV +/— 0.7 KV, for TX—2A\3E) if
the meter indication is out of tolerance, immediates ervice
and correction is required to prevent the possbility of
premature component failure.
3. To prevent an X— Radiation possibility, itis essenta| to use
the specified tube.

a _ | — TX-29A3E
TX-25A3E
Location Of Controls
SCREEN
(P3362)
7 t
Fig.2
Service Hints
= How to remove the rear cover
1. Remove the 8 fixing screws (A) as shown in Fig.3/Fig.4.
CTT TITS
ST TTT Tae
HELO A A
SCREWS (A)
Fig.3.

TX-29A3E
TX-25A3E
How
to
move
the
chassis
into
the
Service
position
1.
Hold
and
lift
the
rear
of
the
E—
PCB
chassis
as
shown
in
fig.5.
and
gently
pull
the
chassis
toward
you.
2.
Release
the
respective
wiring
clips
and
turn
the
chassis
through
90°,
counter—clockwise,
as
shown
in
fig.6.
:
3.
Clip
the
chassis
onto
the
support
bracket
(B)
as
shown
in
fig.6
and
fig.7.
4.
After
servicing
ensure
all
wiring
is
returned
to
its
original
position
before
returning
the
receiver
to
the
customer.
(ho °
SUPPORT BRACKET (B)
SUPPORT
BRACKET
(B)
0000000%000000
CHASSIS
BRACKET
Fig.7.
Fig.6.

ae
HB
eg
se
en
EE
|
TX-29A3E
TX-25A3E
HOW TO MOVE THE CONTROL PANEL, L AND P PCB BOARDS
Place the E board into the service position as shown on page 4.
Remove the three screws (C) (Fig.8) from the front of the chassis.
Lift the two plastic clips (D) (Fig.9) and pull the chassis horizontally outwards, making sure no leads are stressed.
ha ced eta
After servicing ensure all wiring is returned to its origina! position before returning the receiver to the customer.
SCREWS (C)
Fig.8.
a
:
|
|
<)>
oe
Fig.9
IN
Plastic
clip
(D)

‘TX-29A3E
TX-25A3E
Service
position
for
the
A—Board
1.
2
3.
4
on
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
AV
cover
and
unclip
the
AV
cover
from
the
A—board.
Remove
the
three
metal
clips
(F)
(Fig.1
0)
from
the
metal
cover.
Unclip
the
plastic
clips
at
each
corner
of
the
front
metal
cover
(fig.11)
and
remove
from
the
A-board
(fig.12).
Do
the
same
for
the
rear
metal
cover
(fig.13).
Fit
the
3
extension
leads
to
the
A—board
making
sure
that
the
A—board
does
not
touch
the
E—board
(fig.14).
After
servicing
ensure
all
wiring
is
returned
to
its
original
position
before
returning
the
receiver
to
the
customer.
Note
:
The
extension
lead
wire
kit
is
supplied
as
a
service
kit.
(Part
number
TZS2EK025).
Plastic clip
a
Metal clips (F)
A Board

SS
Sits
es
-—
TX-29A3E
TX-25A3E
Adjustment Procedure
ettings/Specia
features
Measure Cathode D651
: so a Voltmeter shows
past Pees +150V-£0.5(TX-29A3E
+147V+0.5V).
a aC
: Place oscilloscope
Pilot
fitter
ai
a
54.7KHZ|
probe
on
pin
19
of
|
Adjust
P1321
Max.
amplitude
ones 1C1301 (ACP2371)
Place
oscilloscope
The
oscilloscope
trace
Sana
py
calor
“Bar
probe
on
pin-
10
of
must
show
1.80V
p-p.
IC1601 (SAD2140). + 0.05V
Slowly turn P4703 anti—
clockwise, set P4703
where the RF AGC volt-
age drops by 0.2V from
the maximum.
230 V AC 50Hz — beam
Operating voltage Enicere
Test pattern
Video
Input
Level
Adjust
P1227.
Receive a_ standard
Colour Bar Signal, 60dB
(75Q) 42dB.
Placeanoscilloscopeon
tuner AGC pin Adjust P4703 clockwise
The
remote
control
is
used
for
entering
and
storing
adjustments,
with
the
exception
of
cut—off
adjustments
which
must
always
be
done
prior
to
service
adjustment.
Perform
adjustments
in
accordance
with
screen
display.
The
display
on
the
screen
also
specifies
the
CCU
variants
as
wellas
the
approx.
setting
values.
Before
you
enter
the
service
mode,
set
contrastto
step
44
and
brightness
to
step
22
andstore
each
of
these
values.
The
adjustment
sequence
for
the
service
mode
is
indicated
below.
1.
Set
the
Bass
to
maximum
position,
set
the
Treble
to
3.
Press
the
YELLOW
/
BLUE
buttons
to
alter
the
function
minimum
position,
press
the
Volume
down
on
the
values.
customer
controls
atthe
front
ofthe
TV
and
atthe
sametime
4.
Press
the
STORE
button
on
the
preset
panel
after
each
press the Reset button onthe remote control, this will place
the TV into the Service Mode.
2. Press the RED / GREEN buttons to step up / down through
the functions.
NOTE:
This
TV
also
has
the
option
of
using
a
Memory
Pack
which
enables
you
to
copy
the
preset
TV
channels
and
analogue
levels
into
the
Memory
Pack
and
then
upload
them
onto
another
EURO—1
TV
set.
adjustment
has
been
made
to
store
the
required
values.
5.
To
exit
the
Service
Mode
switch
off
the
TV.
TV to Memory Pack process Memory Pack to TV Process
1.
Plug
the
memory
pack
into
the
lower
of
the
two
21
pin
ale
Piug
the
memory
pack
into
the
lower
of
the
two
21
pin
terminals
at
the
back
of
the
TV
and
switch
the
TV
on.
If
the
terminals
at
the
back
of
the
TV
and
switch
the
TV
on.
If
the
TV
has
only
one
21
pin
connector
then
this
will
be
able
to
TV
has
only
one
21
pin
connector
then
this
will
be
able
to
accept the memory pack. accept the memory pack.
2.
Go
into
the
Service
Mode
as
explained
above.
The
screen
2.
Go
into
the
Service
Mode
as
explained
above.
The
screen
will show: — will show: —
Program Program
External> >TV External>>TV
3.
Press
the
blue
button
ontheremote
control.
Thescreen
will
3.
Press
the
STORE
button
on
the
TV.
The
screen
will
show: — show: —
Program
:
4.
Press
the
STORE
button
on
the
TV.
The
screen
will
4.
All
the
tuning
information
stored
inside
the
Memory
Pack
show:
—
will
now
be
transferred
to
the
TV.
This
process
will
take
2—3
minutes to complete and when finished the screen will
Storing show:—
5.
All
the
tuning
information
stored
inside
the
TV
will
now
be
OK!
transferred to the Memory Pack. This process willtake 2—3
minutes
to
complete
and
when
finished
the
screen
will
5.
The
tuning
information
from
the
Memory
Pack
has
now
show: — been copied into the TV
OK!
6.
To
exit
from
the
Service
Mode
switch
off
the
TV.
7. The process has now been completed and the Memory
Pack can now be removed.
Errors
if an error occurs while using the Memory Pack the TV will detect this and the screen will show: —
Program
Error!
If
this
happens
then
switch
off
the
TV
and
then
repeat
the
process
that
was
being
used.
If
the
errors
continue
to
occur
then
check
the
connectors
between
the
TV and
the
memory
pack and
check
the
9V
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
5. Horizontal position
6. EW-amplitude
7. EW-—amplitude
8. Trapezium—comp
Position 002
E—W-—AMP 1
EW—Ampl.1 106
E—-W-AMP 2
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
To adjust the screen settings. Turn P3362 to minimum,
place an oscilloscope probe on the cathode with the
highest output and adjust P3368 so the oscilloscope
trace reads 160V-L5V then turn P3362 up so the high-
est numbered box on the TV screen reads 040 + 010.
SCREEN
Press the GREEN button to step through the settings.
Adjust for optimum.
Press the GREEN button to 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 1
6. EW~amplitude 048
EW-—Amp!.1 048
7. EW-amplitude
. Trapezium—comp
. Vertical amplitude
. Horizontal amplitude
. Horizontal position
EW —Ampl.2 044
TRAPEZ—1
Trapez 1 060
TRAPEZ—2
Trapez 2 056
. Trapezium— comp
SW-OVER—1
SW-Over 1 024
SW-OVER-2
11. Switch—over point 142
SW-Over 2 142
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
a
HIGH
LIGHT.
TX-29A3E
TX-25A3E
Settings / Special features
Optimum setting
Optimum setting
Optimum setting
Do not adjust
Optimum setting
Set frequency
To adjust the screen settings. Turn P3362 to ninimum,
place an oscilloscope probe on the cathode vith the
highest output and adjust P3368 so the oscillsscope
trace reads 170V-L5V then turn P3362 up so the high-
est numbered box on the TV screen reads 04) + 010.
Press the GREEN button to step through the settings.
Adjust for optimum.
Press the GREEN button to step through the settings.
Adjust for optimum.
|
3
}
|
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|
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:

TX-29A3E
TX-25A3E
SELF CHECK
Self
check
is
used
to
automatically
check
the
Bus
lines
and
Hexadecimal
code
of
the
TV
set.
To
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: —
If
the
CCU
ports
have
been
checked
and
found
to
be
incorrect
then
Reset Analogue Values
After
exiting
from
the
Self
Check
mode
the
set
will
have
reset
the
EEPROM
to
the
values
descibed
below:
—
ReCallicccc sink dect Gate seen 6 hee Off
Last programme .........-...-2-05- 1
Music / Speech ..............000-- Music
LASTAV. sista wae eek teeta eae sd AV1
Sound
Multi
.............--
2
eee eee
Stereo,
$1
Balance
.......--ccceeeeee
ere
cceee
Centre
Warm-Up
.......
0.
cece
creer
renee
Reset
Programme
data
(0-99)
...........
AFG®
2.05
s33
050
On
J
sebsacdg
SuSardta
Gy
aN
RSENS
belo
ale
tale
ec
acteele
wich
Colour
Sys
..
Auto
leer
ance
icrechdiesea
ead
oe
itet
OAS
eee
Fine
Tune
...
Centre
Sets
to
normal
levels
.............--
Volume
Sb ileiee wunataea GATE tiaras ate gianna Bass
eee
re
er
re
er
Treble
Sivleodvete
hee
atal
Re
wre
mibeecee.e
eeleo
ee
sea
ees
Cojour
ica
Sail
Bed
wa
ates
ies
Seana
Seen
SteNes
ce
ebi
OG
Brightness
scartate Rusia dt aera uneceh oie oie Sars HED ode Tint
is
Rig
deta
d
op
tcecauh
Sgone,
aoe
tthe
pe
ewe
tee
Contrast
GSES R Aen ash alidtg a Wine ese saan iar ede ehel's Sharpness
10
Tuner
SCL1
Key
Scan
VIE
scL2
Fast
Blanking
Priority
EEPROM
SHU
»
Service
Mode
Sound
AV
SDA
switch1
RAM
Sound
AV
XB
switch2
Video
AV
IM
switching
4
switch
Video
AV
ei
gs
switch2
IM
switching
5
98
Sat
tuner
Reset
TPU
co
Hex
codes
IM
bus1
Reset
APU
16
IM
bus2
Stand
By
LED
23
——” will appear in place of "OK".
Fixed Mode Operation
This will reset to the following listed settings and TV systems to
assist fault—finding and servicing of the TV set.
Use the Service Remote Control (Part No. TZS2EK004) to enter
the fixed mode operation as follows.
Press the Service button, located between the Off Timer and
Audio Out buttons, plus one ofthe following numeric keys to select
the desired TV system and listed functions: —
Warsi Rs elena sabe? hee as ne RS eRe Fixed data + PAL
Dis scascolteck lane: ehentdeincoase tela i tatasy agave coasts Fixed data + SECAM
8 heres oh REN adage eee Se5.sed 36 Fixed data + M~NTSC
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Music / Speech .................4. Music

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ALL COMPONENTS ON THE L BOARD HAVE
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N-BOARD TNP8EN012
PARTS LOCATION
PARTS LOCATION
18