Since “-1” and non dash models have different PCB layouts and parts;
When servicing any of these models please confirm the model number
before starting service so the correct manual is used.
This supplement service manual is issued to ADD the models of the NA7DM family listed above to the simplified
service manual order No. MTNC020515A1 (CT-20D12F). Included in this supplement service manual are unique
characteristics and a complete parts list. Please file and use this simplified service manual together with the simplified
service manual order No. MTNC020515A1 (CT-20D12F) and the main service manual order No. MTNC010305C1
(CT-32D11E).
Chassis
“WARNING! This ServiceManualis designed forexperiencedrepairtechnicians only and is not designedfor use bythe general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this Service Manual by anyone else could result in serious injury or death.”
The service technician is requiredtoreadand follow the “safety precautions”and“important safety notice” in this main manual.
Copyright2002by Matsushita Electric Corporation of
America. All rights reserved. Unauthorized copying
and distribution is a violation of law.
Page 2
Important safety notice
Special components are used in this television set which are important for safety. These parts are identified on the
schematic diagram by the symboland printed in BOLD TYPE on the replacement part list. It is essential that
these critical parts are replaced with the manufacturer’s specified replacement part to prevent x-ray radiation,
shock, fire or other hazards. Do not modify the original design without the manufacturer’s permission.
Safety precautions
General guidelines
An Isolation Transformer should always be used
during the servicing of a receiver whose chassis is not
isolated from AC power line. Use a transformer of
adequate power rating as this protects the technician
from accidents resulting in personal injury from
electrical shocks. It will also protect the receiver from
being damaged by accidental shorting that may occur
during servicing.
When servicing, observe the original lead dress,
especially in the high voltage circuit. Replace all
damaged parts (also parts that show signs of
overheating.)
Alwaysreplaceprotectivedevices,suchas
fishpaper, isolation resistors and capacitors, and
shields afterservicing thereceiver. Useonly
manufacturer’s recommended rating for fuses, circuits
breakers, etc.
High potentials are present when this receiver is
operating. Operation of the receiver without the rear
cover introduces danger for electrical shock. Servicing
should not be performed by anyone who is not
thoroughly familiar with the necessary precautions
when servicing high-voltage equipment.
Extreme care should be practiced when handling the
picture tube. Rough handling may cause it to implode
due to atmospheric pressure. (14.7 lbs per sq. in.). Do
not nick or scratch the glass or subject it to any undue
pressure. When handling, use safety goggles and
heavy gloves for protection. Discharge the picturetube by shorting the anode to chassis ground (not to
the cabinet or to other mounting hardware). When
discharging connect cold ground (i.e. dag ground lead)
to the anode with a well insulated wire or use a
grounding probe.
Avoid prolonged exposure at close range to unshielded
areas of the picture tube to prevent exposure to
x-ray radiation.
The test picture tube used for servicing the chassis at
the bench should incorporate safety glass and
magnetic shielding. The safety glass provide shielding
for the tube viewing area against x-ray radiation as well
as implosion. The magnetic shield limits the x-ray
radiation around the bell of the picture tube in addition
to the restricting magnetic effects. When using a
picture tube test jig for service, ensure that the jig is
capableofhandling35kVwithoutcausing
x-ray radiation.
Before returning a serviced receiver to the owner,
the service technician must thoroughly test the unit to
ensure that is completely safe to operate. Do not use a
line isolation transformer when testing.
Leakage current cold check
Unplug the AC cord and connecta jumper between the
two plug prongs.
Measure the resistance between the jumpered AC plug
and expose metallic parts such as screwheads,
antenna terminals, control shafts, etc.
If the exposed metallic part has a return path to the
chassis, the reading should be between 240kΩ and
5.2MΩ. If the exposed metallic part does not have a
return path to the chassis, the reading should be
infinite.
Leakage current hot check (Fig. 1)
Plug the AC cord directly into the AC outlet. Do not use
an isolation transformer during the check.
Connect a 1.5kΩ 10 watt resistor in parallel with a
0.15µF capacitor between an exposed metallic part
and ground. Use earth ground, for example a
water pipe.
Using a DVM with a 1000 ohms/volt sensitivity or
higher, measure the AC potential across the resistor.
Repeat the procedure and measure the voltage
present with all other exposed metallic parts.
Verify that any potential does not exceed 0.75 volt
RMS. A leakage current tester (such a Simpson model
229, Sencore model PR57 or equivalent) may be used
in the above procedure, in which case any current
measure must not exceed 0.5 milliamp. If any
measurement is out of the specified limits, there is a
possibility of a shock hazard and the receiver must be
repaired and rechecked before it is returned to the
customer.
AC VOLTMETER
COLD
WATER
PIPE
(GROUND)
0.15µF
TO
INSTRUMENT’S
EXPOSED METAL
PARTS
1500Ω,10 W
Figure 1. Hot check circuit
X-ray radiation
WARNING: The potential source of x-ray radiation in the
TV set are the high voltage section and the picture tube.
Refer to x-ray protecton circuit check in service
notes in this manual to confirm HHS voltage.
High voltage (CRT anode)
Confirm anode voltage is within limits:
Set the BRIGHTNESS, PICTURE, SHARPNESS and
COLOR to minimum (to obtain a dark image). Measure
high voltage. It should be:
26.60
± 1.25kV.
If the upper limit is out of tolerance, immediate service
and correction is required.
Note: It is important to use an accurate, calibrated
high voltage meter.
-2-
Page 3
Importantsafetynotice...................2
Safetyprecautions.................2
Generalguidelines.................2
Leakagecurrentcoldcheck..........2
Leakagecurrenthotcheck...........2
X-rayradiation.....................2
Highvoltage(CRTanode) ...........2
Servicenotes...........................4
Leadless chip component
(surfacemount) ................4
Componentremoval................4
Chip component Installation . .........4
HowtoreplaceFlat-IC ..............4
X-rayprotectioncircuitcheck.........5
Receiverfeaturetable....................6
Boardsdesignation......................7
Partslist...............................8
Foldoutsnotes.........................14
A-BoardTNP2AH048DR .................16
C-BoardTNP2AA124AF..................21
A-BoardTNP2AH048DS..................22
A&C-PCBBoard.......................28
-3-
Page 4
Service notes
Note: These components are affixed with glue. Be careful not to break or damage any foil under the
component or at the pins of the ICs when removing. Usually applying heat to the component for a short time
while twisting with tweezers will break the component loose.
Leadless chip component
(surface mount)
Chip components must be replaced with identical chips
due to critical foil track spacing. There are no holes in
the board to mount standard transistors or diodes.
Some chips capacitor or resistor board solder pads
may have holes through the board, however the hole
diameter limits standard resistor replacement to 1/8
watt. Standard capacitor may also be limited for the
same reason. It is recommended that identical
components be used.
Chip resistor have a three digit numerical resistance
code - 1st and 2nd significant digits and a multiplier.
Example: 162 = 1600 or 1.6kΩ resistor, 0 = 0Ω (jumper).
Chip capacitors generally do not have the value
indicated on the capacitor. The color of the component
indicates the general range of the capacitance.
Chip transistors are identified by a two letter code. The
first letter indicates the type and the second letter, the
grade of transistor.
Chip diodes have a two letter identification code as per
the code chart and are a dual diode pack with either
common anode or common cathode. Check the parts
list for correct diode number.
Component removal
1. Use solder wick to remove solder from component
end caps or terminal.
2. Without pulling up, carefully twist the component
with tweezers to break the adhesive.
3. Donotreuseremovedleadlessorchip
components since they are subject to stress
fracture during removal.
Chip component Installation
1. Put a small amount of solder on the board
soldering pads.
2. Hold the chip component against the soldering
pads with tweezers or with a miniature alligator clip
and apply heat to the pad area with a 30 watt iron
until solder flows. Do not apply heat for more than
3 seconds.
TYPE
b
e
ANODES
MH DIODE
Chip components
GRADE
c
TRANSISTOR
COMMON
CATHODE
SOLDER
CAPS
CAPACITOR
1ST DIGIT
RESISTOR
SOLDER
CAPS
2ND DIGIT
MULTIPLIER
=1600 = 1.6k
How to replace Flat-IC
- Required tools -
•Soldering iron•De-solder braids
•Sharpen pliers (wire
cutters and long nose)
1. Cut the pins of the defective IC with the wire cutters
pliers, and remove it completely away from the
board. If the IC is glued to the board, apply hot air
to complete the removal. CAUTION- Do not pull or
twist the pliers, may damage the soldering pads in
the board.
Componente
plano
2. Using the soldering Iron and the long nose pliers,
remove the IC pins that still attached to the board.
3. Using the de-solder braid and the soldering iron,
remove the solder from the board soldering pads.
4. Position the new Flat-IC in place (apply the pins of
the Flat-IC to the soldering pads where the pins
need to be soldered). Properly determine the
positions of the soldering pads and pins by
correctly aligning the polarity symbol. Start aligning
and soldering pin no.1, then align and solder the
pin in the apposite corner of the IC, this will help to
align the rest of the pins.
Muesca
5. Solder all pins to the soldering pads using a fine
tipped soldering iron.
Soldadura
6. Check with a magnifier for solder bridge between
the pins or for dry joint between pins and soldering
pads. To remove a solder bridge, use a de-solder
braid as shown in the figure below.
Puente
(en corto)
•Magnifier
Cautin
malla
para desoldar
cautin
Iron
2do punto
Cautin con
punta fina
Malla
1er punto
Cautin
-4-
Page 5
Service notes (continued)
IMPORTANT: To protect against possible damage to
the solid state devices due to arcing or static discharge,
make certain that all ground wires and CTR DAG wire
are securely connected.
CAUTION: The power supply circuit is above earth
ground and the chassis cannot be polarized. Use an
isolation transformer when servicing the receiver to
avoid damage to the test equipment or to the chassis.
Connect the test equipment to the proper ground ( ) or
() when servicing, or incorrect voltages will be
measured.
Procedure:
1. Connect receiver to isolator transformer.
2. Apply a monoscope pattern.
3. In service mode. (Refer to service mode section)
select register C0B.
4. Measure TP5 (TPs port close to tuner). Compare
the measure of TP5 and set the data for C0B
according the following table
TP5
MEASURE (V)
DATA TO
C0B (Hex)
WARNING: This receiver has been designed to meet
or exceed applicable safety and x-ray radiation
protection as specified by government agencies and
independent testing laboratories.
To maintain original product safety design standards
relative to x-ray radiation and shock and fire hazard,
parts indicated with the symbolon the schematic
must be replaced with identical parts. Order parts from
the manufacturer’s parts center using the parts
numbers shown in this service manual, or provide the
chassis number and the part reference number.
For optimum performance and reliability, all other parts
shouldbereplacedwithcomponentsof
identical specification.
X-ray protection circuit check
This test must be performed as final check before the
receiver is returned to the customer. If voltage is out of
tolerance, immediate service and correction is required
to insure safe operation and to prevent the possibility of
premature component failure.
Equipment needed to check the protection circuit:
1. Isolator transformer.
2. High voltage meter.
3. Short jumper.
4. Diode connection jumper.
Use similar diode than D823, refer to parts list for
part No., (diode should support at least 150V.)
0 ~ 0.9300
0.93 ~ 0.9701
0.97 ~ 1.0102
1.01 ~ 1.0503
1.05 ~ 1.0904
1.09 ~ 1.1305
1.13 ~ 1.1706
1.17 ~ 1.2107
5. Exit service mode and turn receiver OFF.
6. Connect a jumper from TPD16 to TPD17.
7. Connect the
diode jumper
, cathode to TPD14
(cold GND), anode to TPD15 (hot GND).
Note: Refer to Fig. 2 for test point location.
8. Apply 75V AC to the AC input of the Insulator
transformer.Turn receiver ON.
9. Set PICTURE and BRIGTHNESS to minimum.
10. Increase the AC voltage at the input of Insulator
transformer and confirm the HHS voltage is
32.0kV, at the point set starts to loose sync,
11. Reset picture controls to original levels.
12. Turn the set OFF, and remove all jumpers and
connections from chassis.
-5-
Page 6
Receiver feature table
FEATURE\MODELCT-20G7DF-1CT-20D12DF-1CT-2017F-1
Chassis NoDP391EP391DP391
FamilyNA7DM
Number of channels181
Menu languageENG/SPAN/FR
Closed CaptionX
V-Chip (USA/CANADA)X
75 Ω inputX
Remote Model numberEUR501450EUR51 150 2EUR501450
Picture tube SupplierSAMSUNG
Comb Filter2DIG
V/A normV
MTS/SAP/DBXX
Built-in audio power1.5Wx2 (10%)
Number of speakers2
AI SoundX
A/V in (rear/front)1(1/1)
Audio Out (F:FAO/V:VAO)---F,V---S-VHS In (rear/front)---1/0---FM Radio---X--EPJ/HPJ/MISCHPJ
Dimensionsmm
(WxDxH)in
Weight (kg/lbs)18/39.6
Anode voltage
Video input jack1Vp-p 75Ω, phono
Audio input jack500mV rms, 47KΩ
515.7x490.5x461.7
20.30x19.31x18.17
26.60 ± 1.25 kV
Table 1. Receiver features
Specifications are subject to change without notice or obligation.
Dimensions and weights are approximate.
*Note: When ordering a board, add and ”S” after the board suffix application.
Example, If order A-Board for
CT-2017F-1
, should be ordered as: TNP2AH048DRS.
Important notice:
Since “-1” and non dash models have different PCB layouts and parts;
When servicing any of these models please confirm the model number
before starting service so the correct manual is used.
-7-
Page 8
REPLACEMENT PARTS LIST
Models: CT-20G7DF-1, CT-20D12DF-1, CT-2017F-1
Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing
any of these components use only manufacturer’s specified parts.
THIS S CHEMATIC DIAGRAM INCORPORATES SPECIAL
FEATURES THAT ARE IMPORTANT FOR PROTECTION FROM
X-RADIATION, FIRE AND ELECTRICAL SHOCK HAZARDS.
WHENSERVICINGITISESSENTIALTHATONLY
MANUFACTURERS SPECIFIED PARTS BE USED FOR THE
CRITICAL COMPONENTS DESIGNATED WITH AIN THE
SCHEMATIC.
SCHEMATIC NOTES
1. Resistors are carbon 1/4W unless noted
otherwise.
2. Capacitors are ceramic 50V unless noted
otherwise.
3. Coil value notes is inductance in µH.
4. Test point indicated by; Test point but no
pin .
5. Components indicated withare cr itical
parts and replacement should be made
with manufacture specified replacement
parts only.
6.(BOLD LINE) indicates the route
of B+ supply.
7. The schematic diagram s are current at
the time of printing and are subject to
change without notice.
-AC input to the Receiver is 120V.
NTSC (HD, 1125i & 525P when
applicable)signalgeneratoris
connected to the antenna of the
Receiver. (Color bar pattern of 100
IRE white and 7.5 IRE black.)
-All Picture and Audio adjustments are
set to Normalize.
TV ANT/CABLE - (Set-Up Menu) in
TV/ANT Mode
Volume - Min.
TV/Video SW - TV position
Audio Mode - Stereo
-Voltage readings are nominal and
may vary ±10% on active devices.
Some voltage reading will vary
with signal strengt h and picture
content.
-Supply voltages are nominal.
2. Ground symbolindicates ground lead
connection of meter.
Incorrect ground connection will result
in erroneous readings.
CAUTION: Incorrect ground connection
of the test equipment will result in
erroneous readings.
CHIP TRANSISTOR
LEAD DE SIGNATION
B
E
used for engineering design
purposes.
C
3
1.indicates waveformmeasurement.
(Measurement can be taken at the best
accessible location in common to the
indicated point.)
2. Taken with an NTSC signal generator
connected to the antenna terminal.
(NTSC color bar pattern of 8 bars of EIA
colors, 100 IRE white and 7.5 IRE black.)
3. Customer Controls (Picture/Audio Menu) are
set t o Normalize. Volume is set to “MIN”.
WAVEFORM MEASUREMENTS
4. All video and color waveforms are taken
with a wideband scope and a probe
with low capacitance (10 to 1). Shape
andpeakaltitudesmayvary
depending on the type of Oscilloscope
used and its settings.
5. Ground symbolshown on waveform
number indicates (Hot) ground lead
connection of the Oscilloscope.
CAUTION: Incorrect ground connection of
the test equipment will result in erroneous
readings.
-14-
Page 15
Notas:
NOTA DE SEGURIDAD
LOSDIAGRAMASELÉCTRICOSINCLUYEN
CARACTERÍSTICAS ESPECIALES MUY IMPORTANTES
PARALAPROTECCIÓNCONTRARAYOS-X,
QUEMADURAS Y DESCARGAS ELÉCTRICAS. CUANDO
SE DE SERVICIO ES IMPORTANTE USAR PARA
REEMPLAZO DE COMPONENTES CRITICOS, SOLO
PARTES ESPECIFICADAS POR EL FABRICANTES. LOS
COMPONENTES CRITICOS ESTAN SEÑALADOS EN LOS
DIAGRAMAS POR EL SIMBOLO.
NOTAS DE LOS DIAGRAMAS
1.Las Resistencias son de Carbón de 1/4W, a
menos que se indique otra característica.
2.Los Capacitores son de Cerámica para
50V, a menos que se indique otra
característica.
3.El valor indicado de las Bobinas es la
inductancia expresada en µH.
4.Los puntos de prueba en la terminal de
algún componente son indicados por Los
puntosdepruebafueradelos
componentes se indican con .
5.Los componentes señalados con el
símbolosonconsiderados
componentes críticos y deben ser
6.(LINEA GRUESA) indica las
7.Los diagramas eléctricos están sujetos a
8.El símboloindica que es una
NOTA: Losdemassímbolosde
IDENTIFICACI ÓNDE TERMINALES
PARA TRANSISTORES EN
B
E
reemplazados sólo con las partes
especificadas por el fabricante.
líneas de alimentación de los Voltajes
B+.
cambio sin previo aviso.
conexión a Tierra Caliente y el símbolo
indica conexión a Tierra Fría.
componentesincluidosson
usados con fines de diseño.
CHIP
C
MEDICIÓN DE VOLTAJES
1.Medición de voltaje:
-El voltaje de entrada al Receptor es de
120VdeCorrienteAlterna.Un
generador de patrones con formato
NTSC se conecta a la entrada de la
antena. (Patrón de Barras de Colores
con 100 IREs para el Blanco y 7.5 IREs
para el Negro.)
-Los ajustes de los Menus Picture y
Audiosenormalizan.
EnelMenúSet-Up,enlaopción
ANTENA, se selecciona el modo de
CABLE.
El nivel de Volumen se minimiza.
De los modos TV y Video, seleccionar el
modo TV.
Seleccionarmodo Estereo del Audio.
MEDICIÓN DE FORMAS DE ONDA
1. Un símbolo comoindica el punto para medir
una señal. (La medición puede hacerse en
el punto con mayor accesibilidad, siempre
que sea com ún al indicado.)
2. Se midieron utilizando un generador con
formato NTSC conectado a la terminal de la
antena. (Patrón de 8 Barras de Colores
EAI, formato NTSC de 100 IREs para el
Blanco y 7.5 IREs para el Negro.)
3. Los ajustes de usuario de los Menus
PICTURE y AUDIO se normalizaron.
Posteriormente el nivel de volumen se
ajusta al mínimo.
4. Las formas de onda de Video y Color
fueron tomadas con un osciloscopio de
3
-Las mediciones de los voltajes son
nominales y pueden variar hasta
10%encomponentesen
funcionamiento. Las lecturas de los
voltajes pueden variar por la
potencia de la señal y el c ontenido
de la imagen.
-Las fuentes devoltajes son
nominales.
2.El símboloindica el tipo de tierra que
se utiliza en la conexión del medidor.
PRECAUCION: SI no se utiliza la
conexión a la tierra adecuada, se
obtendrán mediciones equivocadas y
podría dañar el equipo de medición.
banda alta y con un punta de prueba de
baja capacitancia (10 a 1). La forma y
amplitud de las ondas puede variar
según el tipo de osciloscopio que se
utilice y sus características.
5. El símbolo de tierraque aparece junto al
número de la forma de onda, indica que
se utiliza conexión a Tierra Caliente en
el extremo negativo de la punta de
prueba.
PRECAUCION: Si no se utiliza la conexión
a la tierra adecuada, se obtendrán
mediciones equivocadas y podría dañar el
equipo de medición.
PARTS LIST
-15-
Page 16
TNP2AH048DRCT-2017F-1, CT-20G7DF-1
- 16 -
Page 17
- 17 -
TNP2AH048DRCT-2017F-1, CT-20G7DF-1
Page 18
TNP2AH048DRCT-2017F-1, CT-20G7DF-1
- 18 -
Page 19
- 19 -
TNP2AH048DRCT-2017F-1, CT-20G7DF-1
Page 20
TNP2AH048DR
- 20 -
CT-2017F-1, CT-20G7DF-1
Page 21
- 21 -
TNP2AA124AFCT-2017F-1, CT-20G7DF-1, CT-20D12DF-1
Page 22
TNP2AH048DSCT-20D12DF-1
- 22 -
Page 23
CT-20D12DF-1
- 23 -
TNP2AH048DS
Page 24
TNP2AH048DS
- 24 -
CT-20D12DF-1
Page 25
- 25 -
TNP2AH048DSCT-20D12DF-1
Page 26
TNP2AH048DS
- 26 -
CT-20D12DF-1
Page 27
NOTES:
- 27 -
NOTES
Page 28
A&CPCBBOARDALL MODELS
- 28 -
Page 29
ALL MODELS
- 29 -
A&CPCBBOARD
Page 30
Printed in USA
K02102597PL1113
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