This simplified service manual is issued to add the models of the NA7D family listed above to main manual order No.
MTNC010734C1 (CT-2022HE). Included in this simplified service manual are unique characteristics and a complete
parts list. Please file and use together with the main service manual order No. MTNC010734C1 (CT-2022HE) and
related manuals.
“WARNING! This service manual isdesigned forexperienced repair techniciansonly and is not designed for use by the generalpublic.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products poweredby 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 Manual.
Copyright2002 by Matsushita Electric Corporationof
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 after servicing theReceiver. Use only
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
capable of handling 50kV without causing 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 connect a 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.
Figure 1. Hot check circuit
X-ray radiation
WARNING: The potential source of X-ray radiation in the
receiver isin the high voltagesectionand the picture tube.
Refer to “X-Ray protection circuit check & adjustments”
on page 6 to confirm HHS voltage.
High voltage (CRT anode)
Set the brightness, picture, sharpness and color
controls to minimum (to obtain dark image). Measure
the High Volt age. The high voltage should be
27.70kV ± 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
About lead free solder (PbF)
Note: Lead is listed as (Pb) in the periodic table of elements.
In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder.
The Lead Free Solder used in our ma nufacturing process and discussed below is (Sn+Ag+Cu).
That is Tin (Sn), Silver (Ag) and c opper (Cu) although other types ar e available.
This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For
service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may be
used.
PCBs manufactured using lead free solder will have the “PbF” or a leaf symbolstamped on the
back of PCB.
Caution
• Pb free solder has a higher melting point than standard solder. Typically the melting
point is 50 ~ 70 °F(30~40°C) higher. Please use a high temperature soldering iron
and set it to 700 ± 20 °F(370± 10 °C).
• Pb free solder will tend to splash when heated too high (about 1100 °For600°C).
If you must use Pb solder, please completely remove all of the Pb free solder on the
pins or solder area before applying Pb solder. If this is not practical, be sure to heat the
Pb free solder until it melts, before applying Pb solder.
• After applying PbF solder to double layered boards, please check the component side
for excess solder which may flow onto the opposite side. (see figure below)
slice view
Suggested Pb free solder
There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu
(tin, silver, copper) solder. However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder
canalsobeused.
-3-
Page 4
Importantsafetynotice ...................2
Safetyprecautions..................2
Generalguidelines..................2
Leakagecurrentcoldcheck...........2
Leakagecurrenthotcheck ...........2
X-rayradiation.....................2
High voltage (CRT anode). . . . ........2
Servicenotes ...........................5
Leadless chip component
(surfacemount)....................5
Componentremoval ................5
Chip component installation . . ........5
Howtoreplaceflat-IC...............5
X-ray protection circuit check
&adjustments..................6
Locationofcontrols(Remote) .............9
Identification of components . . . . . . .......10
Audiosignalpathblockdiagram ..........12
Videosignalpathblockdiagram...........13
Partslist ..............................14
Components abbreviations guide. . . .......19
Schematicnotes........................20
A-Boardschematic.......................22
C-Boardschematic.......................27
-4-
Page 5
Service notes
Note:Some components may be affixed with glue. Be careful not to break or damage 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.
Chip components
How to replace flat-IC
- Required Tools -
• Soldering iron• De-solder braids
• Needle nose pliers• Magnifier
• Wire cutters (sharp & small)
1. Cut the pins of a defective IC with wire cutters.
Remove IC from board. If IC is glued to the board,
heat the IC and release the IC. See Note above.
Flat IC
2. Using soldering iron and needle nose pliers
remove the IC pins from the board.
Soldering
Iron
3. Using de-soldering braid and soldering iron remove
solder from affected are on board (pads).
De-soldering
Braid
Soldering
Iron
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). Determine the positions of
the soldering pads and pins by correctly aligning
the polarity symbol. Solder pin #1 first, align the IC.
Polarity
symbol
Solder the pin opposite to pin #1. This will assist
positioning the IC.
5. Solder all pins to the soldering pads using a fine
tipped soldering iron.
2nd solder
1st solder
Solder
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.
-5-
Soldering
Iron
Page 6
IMPORTANT: To protect against possible damage to
the solid state devices due to arcing or static discharge,
make certain that all ground wires and CRT 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.
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
should be replaced with components of identical
specification.
X-Ray protection circuit check &
adjustments
This test must be performed as final check before the
Receiver is returned to the customer. If voltages are out
of tolerance, immediate service and correction is
required to insure safe operation and to prevent the
possibility of premature component failure.
Equipment:
1. Isolation transformer.
2. High voltage meter.
3. Short jumper.
4. Jumper diode (same as D823, PN S3L60P154004).
diode should be rated a minimum of 150V.
Procedure:
1. Connect the receiver to an isolation transformer.
turn receiver ON.
2. Apply a monoscope pattern.
3. In service mode (see service mode section in this
manual) select register C0B.
4. Measure TP5 (located near the tuner). Compare
the measured value to the left column of the table
below. Set C0B with value from the right column
corresponding to the measured level at TP5.
Example, if the measured level at TP5 is 1.03V, set
C0B to 03.
TP5 MEASUREMENTSET C0B TO (HEX)
0 ~ 0.93V00
0.93 ~ 0.97V01
0.97 ~ 1.01V02
1.01 ~ 1.05V03
1.05 ~ 1.09V04
1.09 ~ 1.13V05
1.13 ~ 1.17V06
1.17 ~ 1.21V07
5. Exit service mode and shut it OFF .
6. Connect the short jumper between TPD16 and
TPD17.
7. Connect the jumper diode between TPD14 and
TPD15 (cathode connected to TPD14, anode
connected to TPD15).
8. Apply 75VAC to the input of the isolation
transformer.
9. Turn receiver ON.
10. Set PICTURE and BRIGHTNESS to minimum.
11. Slowly increase the voltage at the input of the
isolation transformer and confirm HHS voltage
measure 34.0KV when the receiver starts to go out
of sync.
12. Turn receiver OFF and remove jumper & diode.
-6-
Page 7
Receiver feature table
FEA TURE/MODELCT-2022HBF/HBCF
ChassisAP395
Tuning system
Number of channels181
Closed CaptionX
V-ChipX
75 Ω inputX
Remote TV OnlyEUR501450
CRT SUPPLIERBMCC
Comb filter2Dig
V/A norm (X=BOTH)V
AUTO ONX
AI Sound (always on)X
Built-in audio power1.5W
Number of speakers1
A/V in (rear/front)(0/1)
Smart plug interfaseSMART PLUG
Dimensionsmm
(HxWxD)in
Weight (kg/lbs)19.7/43.34
40K - GEN
516x492x462
20.28x19.33x18.15
II
Power source (V/Hz)120/60
Anode voltage27.7kV±1.25kV
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 critical
parts and replacement should b e made
with manufacture specified replacement
parts only.
6.(BOLD LINE) indicates the route
of B+ supply.
7. The schematic diagrams are current at
the time of printing and are subject to
change without notice.
-AC input to t he 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 nom inal and
may vary ±10% on active devices.
Some voltage reading will vary
with signal strength 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 DESIGNATION
B
E
used for engineering design
purposes.
C
3
1.indicateswaveform measurement.
(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 c olo r bar pattern of 8 bars of EIA
colors, 100 IRE white and 7.5 IRE black.)
3. Customer Controls (Picture/Audio Menu) are
set to 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.
PARTS LIST
-20-
Page 21
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
IDENTIFICACIÓNDE TERMINALES
PARATRANSISTORES 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
Audio se normalizan.
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 paramedir
una señal. (La medición puede hacerse en
el punto con m ayor accesibilidad, siempre
que sea común 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 contenido
de la im agen.
-Lasfuentes de voltajesson
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 form a 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.
-21-
Page 22
A-Board
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Page 23
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A-Board
Page 24
- 24 -A-Board
Page 25
- 25 -
A-Board
Page 26
A-Board
- 26 -
Page 27
- 27 -
C-Board
Page 28
®
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