Panasonic TC-14Z88AQ Manuel utilisateur

ORDERNO. MTV0401272C3

Colour Television

TC-14Z88AQ

GP3Chassis

SPECIFICATIONS

Specifications

Power Source : ACAUTO 110-240V, 50 / 60 Hz

Power Consumption : 61W

Aerial Impedance : 75 unbalanced

Coaxial type

Receiving System : 17 Systems

Receiving Channels:

VHF 1-11 PAL B(Australia&N.Zealand)

1-12 PAL / SECAMD

1-12 NTSCMJAPAN

2-12 PAL / SECAMB, G

2-13 NTSCMU.S.A.

UHF 21-69 PAL G I / SECAMB, G, K1

28-69 PAL G (Australia)

13-56 PAL D

13-52 NTSCMJAPAN

14-69 NTSCNTSCMU.S.A.

CATV S1-S41 (Hyper)

IntermediateFrequency:

Video 38.0MHz

Sound 31.5MHz(D, K, K1)

32 MHz(I)

32.5MHz(B, G)

33.5MHz(M)

Colour 33.57 MHz(PAL)

33.6MHz(SECAM)

33.75 MHz(SECAM)

34.42 MHz(NTSC)

Video / Audio Terminals:

RAVIn Video In 1Vp-p 75

Audio In Approx. 400mVrms

MonitorOut Video Out1Vp-p 75

Audio OutApprox. 400mVrms

High Voltage: 24.5kV± -1.5

atzero beam current

Picture Tube: A34KQW42X

34cm (14 inches)

Measured diagonally,

90 ° deflection

Audio Output: 5.0W

Dimensions: Height:356.0mm

Width :459.0mm

Depth :379.5mm

Mass : 10.1kg (NetWt.)

Specificationsare subjectto changewithoutnotice. / Mass

and dimensionsshown are approximate.

Unauthorizedcopying and distribution isaviolation oflaw.

1. SafetyPrecautions

1.1. General GuideLines

1. Itisadvisabletoinsertanisolation transformerintheACsupply

beforeservicing thishotchassis.

2. Whenservicing, observetheoriginal leaddress, especiallythe

leaddress inthehigh voltagecircuits. Ifashortcircuitisfound,

replace all parts whichhavebeenoverheatedor damagedbythe

shortcircuit.

3. Afterservicing, see toitthat all theprotectivedevices suchas

insulation barriers, insulation papers, shieldsand isolation R-C

combinations, areproperlyinstalled.

4. Whenthereceiverisnottobeusedfor along period oftime,

unplug thepowercord from theACcord outlet.

5. Potential, as high as 26.0kV ispresentwhenthisreceiverisin

operation. Operation ofthereceiverwithouttherearcover

involves thedangerofashock hazard from thereceiverpower

supply. Servicing shouldnotbeattemptedbyanyonewho isnot

thoroughlyfamiliarwiththeprecautionsnecessarywhenworking

on high voltageequipment. Alwaysdischargetheanodeofthe

picturetubetothereceiverchassisbeforehandling thetube.

Afterservicing make thefollowing leakagecurrentchecks to

preventthecustomerfrom being exposedtoshock hazards.

1.2. LeakageCurrentColdCheck

1. Unplug theACcord and connect ajumperbetweenthetwo

prongson theplug.

2. Turn on thereceiver’spowerswitch. / Measuretheresistance

value, withanohmmeter, betweenthejumperACplug and each

exposedmetalliccabinet parton thereceiver, suchas screw

heads, aerials, connectors, control shafts, etc.Whentheexposed

metallicparthas areturn pathtothechassis, thereading should

bebetween4M and 20 M . Whentheexposedmetal does not

haveareturn pathtothechassis, thereading must beinfinite.

1.3. LeakageCurrentHotCheck (Fig. 1)

1. Plug theACcord directlyintotheACoutlet. Donotuse an

isolation transformerfor thischeck.

2. Check a2k non-inductiveresistor and anAC/DC currentmeter,

inseries witheachexposedmetallicparton thereceiverinturn

and anearthsuchas awaterpipe.

Thecurrentfrom anypointshouldnotexceed0.7mApeak ACor

2mADC. Inthecase ofameasurementbeing outsideofthese

limits specified, thereisapossibilityofashock hazard and the

receivershouldberepairedand recheckedbeforeitisreturnedto

thecustomer.

Fig. 1

1.4. X-Radiation

Warning:

The potential sources of X-Radiation inTVsetare the EHTsection and the picture tube. When

using a picture tube testjigforservice, ensure thatjigis capable of handling 26.0kVwithout

causing X-Radiation.

Note:Itis important to use anaccurate periodicallycalibratedhigh voltage meter.

1. Set thebrightness tominimum.

2. Use theremocon toget intoService Mode.

3. MeasuretheEHT. Themeterreading shouldindicate 24.5±-1.5kV.

Ifthemeterindication isoutoftolerance, immediate service and

correction isrequiredtopreventthepossibilityofpremature

componentfailure.

4. TopreventthepossibilityX-Radiation, itisessential touse the

specifiedpicturetube, ifservice replacementbecomes necessary.

1.5. GP3ChassisBlock Diagram

2. Service Hints

2.1. Service Position for E-Board

1. Removetheback cover.

2. Stand theTV set as showninFig. 2.

3. RemovetheA-Board from theTV set bypulling themainboard

outas showninFigure2.

Fig. 2

2.2. FactoryModeAdjustment

Howtoset :

Toset theFactorymode, press Volume0dac on theTV and Timer

Setting 30 min. on theremote control and press Volume(-) Down

button on theTV togetherpress recall on theremote control. /

CHK shouldappearon rightofTV screen. / Tomovefrom CHK1to

CHK2mode, etc. please followbelowrotation :

ToSet Self-Check :

Press theVolumeDownbutton on TV thenpress theOff Timer

button on remote control.

2.3. Adjustmentfor White Balance

Preparation:

1. Receivethewhite balance pattern and aging shouldhavebeen

performedover30 minutes.

2. Set thepicturemenu toDYNAMICNORMAL.

3. Degauss theCRTface.

4. FixtheCRTcolour analyzerreceiverunittoCRTface.

Adjustment of LowLight.

1. AdjustmentSub Bright, sothat Y =7.0±1.0nit.

2. AdjustmentR-CUTOFF, sothat X =0.238 ±0.010 nit.

3. AdjustmentG-CUTOFF, sothat Y =0.229 ±0.010 nit.

Adjustment of High Light

1. AdjustmentSub Bright, sothat Y =155 nit.

2. AdjustmentR-Drive, sothat X =0.263 ±0.010 nit.

3. AdjustmentB-Drive, sothat Y =0.273 ±0.010 nit.

2.4. Adjustmentfor CRTCUTOFF

Preparation:

1. Connect theoscilloscopeprobetoTPL5.

2. ScreenVRmin.

3. Set thedata Sub Bright, Bright.

4. Inservice Modeat “Bright”dac press [5] infactorymodetoenter

vertical lineand adjust byvolumedownor up button.

5. Adjust “ScreenVR”until 1-HLineappears.

2.5. AdjustmentProcedure

Item/ Preparation Adjustment Procedure

+B Voltage

Confirmthe DC voltage atthe indicatedtestpoints,

1. Operate the TVset. TPA10 :141.0 ±2.0V

2. Setcontrol as follows : TPA8 :8 ±1V

Brightness ........... minimum TPA9 :5 ±1V

Contrast.............. minimum TPA21 :175 ±15

RFAGC

1. Receive a colourbarsignal atanRF

level of 69 +1-2 dBU with 75

loaded.

1. Select“RFAGC”indication inCHK2, on Screen

control atfactorymode.

2. Connectdigital multimeterto RF

AGC atTuner. 2. SetRFAGC byusing remote control Volume (+)

(-) button until voltage AGC atTunerreaches 2.6 ±

0.1V

TPA15 (Tunerpoint).

3. Increase RFsignal strength by2dB, confirmAGC

voltage drop.

High Voltage

1. Receive the crosshatchpattern. 1. Connecta DC voltage meterto TPA12 and

confirm

voltage is 141.0 ±2.0V.

2. Setto 0 Beam.

ScreenVR .......... minimum 2. Connecta high frequencyvoltmeterto heaterand

confirm

thatvoltage reads 6.0 ±0.24 (VRMS).

Contrast.............. minimum

3. Normalize the brightness and contrast.

Item/ Preparation Adjustment Procedure

NTSC TINTCOLOUR

Connecta shortjumperbetweenTPA

10 and TPA20.

Press MainMenu and setsystemto

use AV-NTSC (3.58 MHz).

DYNAMIC ................. Normal

ChannelCLR Set..... STD

1. AdjustSub-Tint sothatNo. 2, 3 and 4 becomes

level

waveformis similarto Fig. 3.

2. Confirmphase atTint is changes more than±30

control.

3. Confirmthatcolourlevel is maximum when

colour

adjustedto maximum position.

Note:Use remote control onlywhenadjusting

user

Sub-Tint.

Fig. 3

2.6. PALColour

1. ReceivethePALB/G studiocolour barpattern and adjust local

frequencyat thebest tunedposition.

2. PicMenu:DynamicNormal, Confirm Contrast -63, Sub Contrast -

21.

3. Channel colour set --------- STD

4. “CHK2”and press digitkey“5”(AKB OFF)alsoconfirm OSD

becomebluecolour.

5. Connect TPA10 toTPA20.

6. Set (A)to1.9±0.1V byBRT(CHK2) at measurementpointTPL2

Fig. 4.

2.7. Adjustment

1. Connect oscilloscopeprobetoTPL2(G OUT)with10k series

resistor and adjust Contrast sothat (B) as inFig. 4is2.60 ±0.05V.

2. Adjust “Sub Colour” sothat waveform as inFig. 4(1) 2.3±0.2V.

3. Connect oscilloscopeprobetoTPL1(R OUT)with10k series

resistor and confirm waveform as inFig. 5is(2) 2.3±0.2V.

4. Take outjumperTPA10 and TPA20.

5. Press digitkey“5”(AKB ON) and confirm theOSDbecomewhite

colour.

Before ColourPurity, Convergence and White Balance

adjustment are attempted,

V. Height, H. Centre and Focus adjustments mustbe completed.

ColourPurity

1. Set theBrightness and Contrast controlstotheirmaximum

positions.

2. Operate theTV set for 60 minutes.

3. Fullydegauss thepicturetubebyusing anexternal degaussing

coil.

4. Applyacrosshatchpattern signal and adjust thestatic

convergence magnets totheapproximatelycorrect position.

5. Receiveablack and white signal.

6. Set thecontrol as follows:/ Red................minimum /

Green.............minimum / Blue...............minimum / Press the

Shipping button on theremote control twice toselect CRT

AdjustmentModetoselect lowlight.

7. Loosentheclamp screwfor theDeflection Yoke AinFig. 10 and

movetheDeflection Yoke as close tothepuritymagnet as

possible.

8. Adjust thepuritymagneticringssothat avertical greenfieldis

obtainedat thecentreofthescreen.

Fig. 6

9. SlowlypushtheDeflection Yoke and set itwhereauniform green

fieldisobtained. Fig. 21

10. Re-adjust theLowLightcontrolstotheircorrect settingsand

make surethat auniform white fieldisobtained.

11. Tightentheclamp screwAinFig. 10.

Convergence

1. Applyacrosshatchpattern signal and NormalizeContrast control

tothemaximum positions.

2. Adjust Brightness until thegreyposition ofthecrosshatch

pattern just becomes black.

3. Adjust theRedand Bluelineat thecentreofthescreenby

rotating theR-B static. Fig. 8

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