Panasonic TC-21PM50A Manuale utente

ORDERNO. MTV0308252C3

Colour Television

TC-21PM50A

GP3 Chassis

SPECIFICATIONS

Specifications

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

Dimensions: Height : 486.0mm

Width: 510.0mm

Depth: 489.0mm

Mass : 24.7kg(Net Wt.)

Specificationsare subject tochangewithout notice. / Mass

and dimensionsshownare approximate.

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.

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

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

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.

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

Item/ Preparation Adjustment Procedure

+B Voltage

Confirm the DC voltage at the indicatedtest points,

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

control at factorymode.

2. Connect digital multimetertoRF

AGC at Tuner. 2. Set RFAGC byusing remote control Volume (+)

(-) button until voltage AGC at Tunerreaches 2.6 ±

0.1V

TPA 15 (Tunerpoint).

3. Increase RFsignal strengthby2dB, confirm AGC

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

control.

3. Confirm that colourlevel is maximumwhen

colour

adjustedtomaximumposition.

Note: Use remote control onlywhenadjusting

user

Sub-Tint.

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.

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

Indice

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