Panasonic TX-21JT1P User manual

ColourTelevision
TX-21JT1P
TC-21JR1P
TX-14JT1P
TC-14JR1P
Z7Chassis
SPECIFICATION
(Information inbrackets{} refertoTX-14JT1P,TC-14JR1P)
PowerSource: 220-240Va.c., 50Hz
PowerConsumption: 72W{47W}
Stand-byPower
Consumption: 1,1W
Aerial Impedance: 75 unbalanced,Coaxial Type
ReceivingSystem: PALB/G, D/K,PAL-60
SECAMB/G,D/K
ReceivingChannels:
VHFE2-E12VHFH1-H2(ITALY)
VHFA-H(ITALY)UHFE21-E69
CATV(S01-S05) CATV S1-S10(M1-M10)
CATVS11-S20(U1-U10) CATV S21-S41(HYPERBAND)
VHFR1-R2VHFR3-R5
VHFR6-R12
IntermediateFrequency:
Video/Audio
Video38,9MHz
Audio33,4MHz, 32,4MHz
Colour34,47MHz(PAL)
34,5MHz(SECAM)
34,65 MHz(SECAM)
Terminals:
AV1INVideo (21pin)1Vp-p75
Audio(21pin)500mVrms10k
RGB(21pin)
AV1OUTVideo (21pin)1Vp-p75
Audio(21pin)500mVrms1k
RCAINVideo1Vp-p75
RCAINAudio500mVrms10k
HighVoltage: 26,7kV±1kV{22,7kV±1kV}
PictureTube: A51EAL155X1351cm
{A34EAC01X1334cm}
AudioOutput: 6W(M.P.O.)
3W(R.M.S.)
8 Impedance
Headphones: 8Impedance
Accessories
supplied: RemoteControl
2xR6(UM3) Batteries
Dimensions:
Height:476mm{352mm}
Width:512mm{371mm}
Depth:470mm{371,5mm}
Netweight: 20,6kg{9,5kg}
Specifications aresubject tochange without notice.
Weightsanddimensionsshownareapproximate.
NOTE:ThisServiceManualshouldbeusedin
conjunctionwiththeZ7Technicalguide.
ORDERNo. 00-SM-005

CONTENTS
SAFETYPRECAUTIONS..........................................................................................................................................................2
SERVICEHINTS.......................................................................................................................................................................3
ADJUSTMENTPROCEDUREANDFACTORYSETTINGS.....................................................................................................4
WAVEFORMPATTERNTABLE...............................................................................................................................................5
ALIGNMENTSETTINGS...........................................................................................................................................................6
BLOCK DIAGRAMS..................................................................................................................................................................7
PARTS LOCATION.................................................................................................................................................................10
REPLACEMENTPARTSLIST................................................................................................................................................11
SCHEMATICDIAGRAMS.......................................................................................................................................................20
CONDUCTORVIEWS.............................................................................................................................................................27
SAFETYPRECAUTIONS
GENERAL GUIDELINES
1.It isadvisabletoinsert anisolation transformerinthe
a.c. supplybeforeservicing ahot chassis.
2.Whenservicing,observetheoriginal leaddressinthe
highvoltagecircuits.If ashortcircuit isfound, replace
all partsthathavebeenoverheatedor damaged by
theshort circuit.
3.Afterservicing, see thatall theprotectivedevices
such as insulationbarriers, insulationpapers,shields
andisolationR-Ccombinationsarecorrectly
installed.
4.Whenthe receiver isnotbeing usedfor along period
of time,unplug thepowercordfromthea.c. outlet.
5.Potentialsashighas27,7kV{23,7kV} arepresent
whenthisreceiver isinoperation. Operationof the
receiver without therearcoverinvolves thedanger of
ashockhazardfromthereceiver powersupply.
Servicingshouldnot beattemptedbyanyone who is
not familiar withtheprecautionsnecessarywhen
working onhighvoltage equipment. Always
dischargetheanode of thetube.
6.Afterservicingmakethefollowing leakagecurrent
checkstoprevent the customer frombeingexposed
toshockhazard.
LEAKAGECURRENTCOLDCHECK
1.Unplug the a.c. cordandconnect ajumper between
thetwoprongsof theplug.
2.Turnonthereceiver spower switch.
3.Measuretheresistancevaluewithanohmmeter,
betweenthe jumpereda.c. plugand each exposed
metalliccabinet part onthereceiver, such as screw
heads, aerials,connectors, control shaftsetc. When
theexposedmetallicpart hasareturnpathtothe
chassis,thereading shouldbebetween4Mohmand
20Mohm.Whentheexposed metaldoes nothavea
returnpathtothechassis, the readingmustbe
infinite.
LEAKAGECURRENTHOTCHECK
1.Plug thea.c.corddirectlyintothe a.c.outlet. Donot
useanisolationtransformerforthischeck.
2.Connect a2k 10Wresistor inseries withan
exposedmetallicpart onthereceiverandan earth,
such as awater pipe.
3.Useana.c. voltmeter withhighimpedanceto
measurethepotential acrosstheresistor.
4.Check each exposedmetallicpart andcheckthe
voltageat each point.
5.Reversethea.c.plugat theoutlet andrepeateachof
theabovemeasurements.
6.Thepotentialat anypoint shouldnot exceed
1,4Vrms. Incaseameasurementisoutsidethelimits
specified, thereisapossibilityofashock hazard, and
thereceivershouldberepairedand recheckedbefore
it isreturned tothecustomer.
X-RADIATIONWARNING
1.Thepotentialsourcesof X-RadiationinTVsetsare
thehighvoltagesection andthepicturetube.
2.Whenusing apicturetubetest jigfor service, ensure
that thejigiscapableofhandling27,7kV{23,7kV}
without causingX-Radiation.
NOTE: It isimportanttousean accurateperiodically
calibratedhigh voltagemeter.
1.Set thebrightnesstominimum.
2.Measurethe highvoltage. The metershouldindicate
26,7kV±1kV{22,7kV±1kV}.
If the meterindicationisout of tolerance, immediate
serviceandcorrectionisrequiredtoprevent thepossibility
ofprematurecomponent failure.
3.To prevent anyX-Radiationpossibility,it isessential
tousethespecifiedtube.
HOTCHECKCIRCUIT
a.c.VOLTMETER
WATER PIPE
(EARTH)
TOINSTRUMENT'SEXPOSED
METALLIC PARTS Fig.1.
2k 10 Watts
2

SERVICEHINTS
Howto remove therearcover
1.Removethe5screwsas shownin Fig.2.
LOCATIONOFCONTROLS
3
Fig.2.
Fig.3.
Screews
E- Board Y- Board Focus
Screen

ADJUSTMENTPROCEDURE
Item/ PreparationAdjustments
Confirmthefollowingvoltages.
TPE1 10±1V TPE11 -13,2±1V
TPE2 5,2±0,3V{-13,8±1V}
TPE3 13±1V TPE12 13,2±1,5V
{13,5±1V}{12,8±1,5V}
TPE4 21,5±1,5V TPE13 125±1,5V
{20,5±1,5V}{104±1,5V}
TPE5 5±0,3V TPE14 7,9±1V
TPE6 9±1V TPE18 8,2±1V
TPE9 30,4±2,5V{8,1±1V}
{31±2,5V} TPE19 31±1V
TPE10 191±10V{30,6±1,5V}
{147±10V}
+BSET-UP
1.OperatetheTVset, patterncrosshatch.
2.Set thecontrols:
BrightnessMinimum
ContrastMinimum
VolumeMinimum
FACTORYSETTINGS
Toreturncustomersettingstofactorysettingsandclear owner IDof all informationinputbythecustomer, enter Self-Check
mode. Pressthedown (-/v) button onthecustomercontrolsatthefrontof the TV set, at thesametimepressing the STATUS
buttonontheremotecontrol. To exit Self Check,switchoff theTV setatthepower button.
ServiceAids
Toaidintheservice of ourcurrent chassisthereareanumberof Service Aidswhichhavebeenmadeavailable.
LUCI interfacekit (Linked Utility Computer Interface)
Part number:TZS6EZ002
Thiscontains interface andcablesfor connectingTVserviceconnector andaPCaswell asdiagnosticsoftware. Asnew
modelsareintroducedupgradesoftwarewill becomeavailable.
VICI (Visual Interactive Computer Information)
TheseC.D.'scontainmultimediadocumentationprovidingquickaccesstoserviceinformation.
Part No. TZS7EZ006,TZS7EZ005, TZS8EZ001&TZS9EZ001
1.ServiceManuals
2.InstructionBooks
3.Technical Information
TASMIN (Technically Advanced Systemfor Multimedia Interactive Notes)
Aswell asprovidingafirststep towards moreinteractivetrainingthisproduct alsoachievesquickaccesstoTechnical
Information.
OPTIONF7
4
NOTE: Self Checkshouldonl
y
beusedwhenrefurbishin
g
the TV setandnotdurin
g
normal re
p
airwork.

WAVEFORMPATTERNTABLE
5
CONDITIONS:
Contrast:MAX
Brightness:MID
Colour:MID
CATS: OFF
Sharpness:MID

ALIGNMENTSETTINGS
1.Select programposition60andsetthesharpnesstominimum.
2.Pressthe Off Timer buttononthe remotecontrolandat thesametimepressthe (down) buttonon thecustomer
controlsat the front of theTV, thiswill placetheTV intoServiceMode.
3.Pressthe / buttonstostepup / downthrough thefunctions.
4.Pressthe +/ -buttonstoafter the function values.
5.Pressthe STORE buttonafter each adjustmenthasbeenmadetostoretherequiredvalues.
6.To exit ServiceMode pressthe Normalizationbutton.
NOTE : Thefiguresusedbelowarenominal andusedfor representativepurposesonly.
AlignmentFunction Settingindication
Note: All setting valuesareapproximate Settings /Special features
1.Vertical amplitude V-Amp
31
Optimumsetting
2.Vertical position V-Pos
22
Optimumsetting
3. Horizontal centre H-Ctr
07
Optimumsetting.
4.Redcutoff R-Cut
148
Optimumsetting.
5. Green cutoff G-Cut
146
Optimumsetting.
6. Bluecutoff B-Cut
163
Optimumsetting.
7. Reddrive R-Drv
37
Optimumsetting.
8.Bluedrive B-Drv
25
Optimumsetting.
9.AGC AGC
29
Optimumsetting.
10. Subcontrast S-Con
26
Optimumsetting.
11. Subcolour S-Col
49
Optimumsetting.
12. Subbright S-Bri
43
Optimumsetting.
6

PARTSLOCATION
NOTE:
The numberson theexplodedviewbelowrefer tothe
explodedviewsectionof theReplacementPartsList.
10
2
5
18
9
8
13
22
17
19
3
10
14
15
11
1
21
4
16
12
6
7
20

SCHEMATICDIAGRAMS FORMODEL
TX-21JT1P,TC-21JR1P, TX-14JT1P,TC-14JR1P
(Z7CHASSIS)
NOTE
1.RESISTOR
All resistorsarecarbon ¼Wresistor, unlessmarkedotherwise.
Unit of resistance isOHM ( ) (k=1,000, M=1,000,000)
2.CAPACITORS
All capacitorsareceramic50Vunlessmarkedotherwise.
Unit ofcapacitanceis Funlessotherwisestated.
3.COIL
Unit ofinductanceis H, unlessotherwisestated.
4.TESTPOINT
TestPoint Position
5.EARTHSYMBOL
ChassisEarth(Cold)
LineEarth(Hot)
6.VOLTAGEMEASUREMENT
Voltageismeasuredbyad.c. voltmeter.
Measurement conditionsareasfollows:
Power sourcea.c.220V-240V,50Hz
ReceivingSignalColour Barsignal (RF)
All customercontrolsMaximumposition
7.
IndicatestheVideosignal path
IndicatestheAudiosignal path
Theseschematicdiagramsarethe latestat timeofprinting and aresubject tochangewithoutnotice.
REMARKS
a.Donot touchthehotpart, or the hotandcoldpartsat thesametime, asyouareliabletoashockhazard.
b.Donotshort circuit thehot andcoldcircuitsaselectricalcomponentsmaybe damaged.
c.Donotconnect aninstrument, suchasanoscilloscope, tothe hotandcoldcircuitssimultaneouslyasthismaycause
fusefailure. Connect theearthof theinstrumentstotheearthconnection of thecircuit beingmeasured.
d.Makesuretodisconnect the power plug beforeremovingthechassis.
NOTE
1.ThePower SupplyCircuit containsacircuit area, whichusesaseparatepower supplytoisolatetheearthconnection.
The circuit isdefinedbyHOTand COLDindications inthe schematicdiagram. All circuits, except the PowerCircuit,are
COLD.
IMPORTANTSAFETYNOTICE
Componentsidentifiedbymarkhavespecial characteristics
importantfor safety.Whenreplacing anyofthesecomponents,use
onlymanufacturers' specified parts.
20