Panasonic TC-21PM50A User manual

ORDERNO. MTV0308252C3
Colour Television
TC-21PM50A
GP3 Chassis
SPECIFICATIONS
Specifications
1

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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2.2. FactoryMode Adjustment
How to set :
To set the Factorymode, press Volume 0dac on the TV and Timer
Setting 30 minon the remote control and press Volume (-) Down
button on the TV together press recall on the remote control. /
CHK shouldappear on right of TV screen. / To move from CHK1to
CHK2mode, etc. please follow below rotation :
To Set Self-Check :
Press the Volume Downbutton on TV then press the Off Timer
button on remote control.
2.3. Adjustment for White Balance
Preparation:
1. Receive the white balance pattern and aging shouldhave been
performed over 30 minutes.
2. Set the picture menu to DYNAMICNORMAL.
3. Degausse the CRTface.
4. Fixthe CRTcolour analyzer receiver unitto CRTface.
Adjustment of LowLight.
1. Adjustment Sub Bright, so that Y= 6.3± 1.0nit.
2. Adjustment R-CUTOFF, so that X= 0.235 ± 0.010 nit.
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3. Adjustment G-CUTOFF, so that Y= 0.235 ± 0.010 nit.
Adjustment of High Light
1. Adjustment Sub Bright, so that Y= 270 nit.
2. Adjustment R-Drive, so that X= 0.265 ± 0.010 nit.
3. Adjustment B-Drive, so that Y= 0.265 ± 0.010 nit.
2.4. Adjustment for CRTCUTOFF
Preparation:
1. Connect the oscilloscope probe to TPL5.
2. Screen VRmin.
3. Set the data Sub Bright, Bright.
4. Inservice Mode at “Bright” dac press [5] infactorymode to enter
vertical line and adjust byVolume Downor Upbutton.
5. Adjust “Screen VR”until 1-HLine appears. (AKB OFF)
6. Adjust Bright, so the voltage at TPL5 is130 volt.
7. Press digitkey“5” AKB ONand confirm inpicture mode.
2.5. Adjustment Procedure
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Item/ Preparation Adjustment Procedure
+B Voltage Confirm the DC voltage at the indicatedtest points,
as
:
1. Operate the TV set. TPA 10 : 140.5 ± 1.5V
2. Set control as follows : TPA 8 : 8 ± 1V
Brightness ...........minimum TPA 9 : 5 ± 1V
Contrast .............. minimum TPA 21 : 175 ± 15V
RFAGC
1. Receive a colourbarsignal at anRF
level of 69 ± 1-2 dBU with75
loaded.
1. Select “RFAGC” indication inCHK2, on Screen
by
control at factorymode.
2. Connect digital multimetertoRF
AGC at Tuner. 2. Set RFAGC byusing remote control Volume (+)
or
(-) button until voltage AGC at Tunerreaches 2.6 ±
0.1V
TPA 15 (Tunerpoint).
3. Increase RFsignal strengthby2dB, confirm AGC
at
voltage drop.
High Voltage
1. Receive the crosshatchpattern. 1. Connect a DC voltage metertoTPA 20 and
confirm
voltage is 140.5 ± 1.5V.
2. Set to0 Beam.
ScreenVR .......... minimum 2. Connect a high frequencyvoltmetertoheaterand
confirm
that voltage reads 6.3 ± 0.48 (VRMS).
Contrast .............. minimum
3. Normalize the brightness and contrast.
Item/ Preparation Adjustment Procedure
NTSC TINTCOLOUR
Connect a short jumperbetweenTPA
10 and TPA 20.
Press MainMenu and set systemto
use AV-NTSC (3.58 MHz).
DYNAMIC ................. Normal
Channel CLR Set ..... STD
1. Adjust Sub-Tint sothat No. 2, 3 and 4 becomes
level
waveform is similartoFig. 3.
2. Confirm phase at Tint is changes more than± 30
by
control.
3. Confirm that colourlevel is maximumwhen
colour
adjustedtomaximumposition.
Note: Use remote control onlywhenadjusting
user
Sub-Tint.
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Fig. 3
2.6. PALColour
1. Receive the PALB/G studiocolour bar pattern and adjust local
frequencyat the best tuned position.
2. PicMenu: DynamicNormal, Confirm Contrast -100AC, Sub
Contrast -21DAC.
3. Channel colour set --------- STD.
4. “CHK2” and press digitkey“5” (AKB OFF) also confirm OSD
become blue colour.
5. Set ABLOFF (Note :ABLisset off in(CHK2).
6. Set (A)to 2.3± 0.2V byBRT(CHK2) at measurement point TPL 2
Fig. 4.
2.7. Adjustment
1. Connect oscilloscope probe to TPL 2(G OUT) with 10k series
resistor and adjust Contrast so that (B)as inFig. 4is2.6± 0.1V.
2. Adjust “Sub Colour” so that waveform as inFig. 4(1) 2.5± 0.1V.
3. Connect oscilloscope probe to TPL 1(ROUT) with 10k series
resistor and confirm waveform as inFig. 5is(2) 2.7± 0.4V.
4. Set ABLON(Note :Exit(CHK2mode).
5. Press digitkey“5” (AKB ON)and confirm the OSDbecome white
colour.
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Before ColourPurity, Convergence and White Balance
adjustment are attempted,
V. Height, H. Centre and Focus adjustments must be completed.
ColourPurity
1. Set the Brightness and Contrast controlsto theirmaximum
positions.
2. Operate the TV set for 60 minutes.
3. Fullydegausse the picture tube byusing an external degaussing
coil.
4. Applyacrosshatch pattern signal and adjust the static
convergence magnets to the approximatelycorrect position.
5. Receive ablack and white signal.
6. Set the control as follows: / Red................minimum /
Green.............minimum / Blue.................minimum / Press the
Shipping button on the remote control twice to select CRT
Adjustment Mode to select low light.
7. Loosen the clamp screw for the Deflection Yoke AinFig. 10 and
move the Deflection Yoke as close to the puritymagnet as
possible.
8. Adjust the puritymagneticrings so that avertical green fieldis
obtained at the centre of the screen.
Fig. 6
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