Panasonic TC-21PM50A User manual

ORDERNO. MTV0308252C3
Colour Television
TC-21PM50A
GP3 Chassis
SPECIFICATIONS
Specifications
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Power Source : AC AUTO 110-240V, 50/60 Hz
Power Consumption : 66W
Aerial Impedance : 75 unbalanced
Coaxial type
Receiving System : 17 Systems
Receiving Channels:
VHF 2-12 (PAL/SECAM B, K1)
0-12 (PALB AUST.)
1-9(PALB N.Z.)
1-12 (PAL/SECAM D)
1-12 (NTSC M JAPAN)
2-13 (NTSC M U.S.A.)
UHF 21-69 (PALG, H, I/SECAM G, K, K1)
28-69 (PALB AUST.)
13-57 (PALD, K)
13-62 (NTSC M JAPAN)
14-69 (NTSC M U.S.A.)
CATV S1-S41 (OSCAR)
1-125 (U.S.A. CATV)
C13-C41 (JAPAN)
S21-S41 (HYPER)
Z1-Z37 (CHINA)
IntermediateFrequency:
Video 38.0MHz
Sound 31.5MHz (D, K, K1) / 32.5MHz (B, G)
32.0MHz (I) / 32.5MHz (M)
Colour 33.57 MHz (PAL)
33.6MHz (SECAM)
32.5MHz (B, G)
33.75 MHz (SECAM)
34.42 MHz (NTSC)
Video/ AudioTerminals:
FAV In VideoIn1Vp-p75
AudioInApprox. 400mVrms
RAV In VideoIn1Vp-p75
AudioInApprox. 400mVrms
MonitorOut VideoOut 1Vp-p75
AudioOut Approx. 400mVrms
High Voltage: 28.1kV (±1.5)
at zerobeam current
Picture Tube: A51QDX992X
51cm (21 inches)
Measureddiagonally,
90° deflection
AudioOutput : 3.5W
Speaker : 8
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Dimensions: Height : 486.0mm
Width: 510.0mm
Depth: 489.0mm
Mass : 24.7kg(Net Wt.)
Specificationsare subject tochangewithout notice. / Mass
and dimensionsshownare approximate.
2003 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution isaviolation of law.
1. Safety Precautions
1.1. General Guide Lines
1. Itisadvisableto insert an isolation transformer inthe AC supply
before servicing thishot chassis.
2. When servicing, observe the original lead dress, especiallythe
lead dress inthe high voltage circuits. Ifashort circuitisfound,
replace all parts which have been overheated or damaged bythe
short circuit.
3. After servicing, see to itthat all the protective devices such as
insulation barriers, insulation papers, shields and isolation R-C
combinations, are properlyinstalled.
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4. When the receiver isnot to be used for along period of time,
unplug the power cord from the AC cord outlet.
5. Potential, as high as 29.0kV ispresent when thisreceiver isin
operation. Operation of the receiver without the rear cover
involves the danger of ashock hazard from the receiver power
supply. Servicing shouldnot be attempted byanyone who isnot
thoroughlyfamiliar with the precautions necessarywhen working
on high voltage equipment. Alwaysdischarge the anode of the
picture tube to the receiver chassisbefore handling the tube.
After servicing make the following leakage current checks to
prevent the customer from being exposed to shock hazards.
1.2. Leakage Current ColdCheck
1. Unplug the AC cord and connect ajumper between the two
prongs on the plug.
2. Turn on the receiver’spower switch. / Measure the resistance
value, with an ohmmeter, between the jumper AC plug and each
exposed metalliccabinet part on the receiver, such as screw
heads, aerials, connectors, control shafts, etc. When the exposed
metallicpart has areturn path to the chassis, the reading should
be between 4M and 20 M . When the exposed metal does not
have areturn path to the chassis, the reading must be infinite.
1.3. Leakage Current Hot Check (Fig. 1)
1. Plug the AC cord directlyinto the AC outlet. Donot use an
isolation transformer for thischeck.
2. Check a2k non-inductive resistor and an AC/DC current meter,
inseries with each exposed metallicpart on the receiver inturn
and an earth such as awater pipe.
The current from anypoint shouldnot exceed 0.7mApeak AC or
2mADC. Inthe case of ameasurement being outside of these
limits specified, there isapossibilityof ashock hazard and the
receiver shouldbe repaired and rechecked before itisreturned to
the customer.
Fig. 1
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1.4. X-Radiation
Warning:
The potential sources of X-Radiation inTV set are the EHTsection and the picture tube. When
using a picture tube test jigforservice, ensure that jigis capable of handling 29.0kV without
causing X-Radiation.
Note: It is important touse anaccurate periodicallycalibratedhigh voltage meter.
1. Set the brightness to minimum.
2. Use the remocon to get into Service Mode.
3. Measure the EHT. The meter reading shouldindicate 27.5(±1.5)kV.
Ifthe meter indication isout of tolerance, immediate service and
correction isrequired to prevent the possibilityof premature
component failure.
4. To prevent the possibilityX-Radiation, itisessential to use the
specified picture tube, ifservice replacement becomes necessary.
1.5. GP3 ChassisBlock Diagram
2. Service Hints
2.1. Service Position for E-Board
1. Remove the back cover.
2. Stand the TV set as showninFig. 2.
3. Remove the A-Board from the TV set bypulling the mainboard
out as showninFig. 2.
Fig. 2
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