Panasonic TC-14Z88AQ User manual

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.
2004 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
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,
as
:
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
by
control atfactorymode.
2. Connectdigital multimeterto RF
AGC atTuner. 2. SetRFAGC byusing remote control Volume (+)
or
(-) button until voltage AGC atTunerreaches 2.6 ±
0.1V
TPA15 (Tunerpoint).
3. Increase RFsignal strength by2dB, confirmAGC
at
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
by
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