Panasonic TX-43P250 User manual

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Service Manual
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ORDERNO.ITD0110012C3
Projection Television
lTX-43P250/TX-51P250/TC-43P250/TC-51P250
EURO-7VPChassis
Specifications
PowerSource:
TX-43/51P250, TC-51P250H:AC220V-240V, 50/60Hz
TX-43/51P250X:AC110V-240V, 50/60Hz
PowerConsumption:
TX-43/51P250, TC-51P250H:228W
TX-43/51P250X:238W
3.0W(Stand-by condition)
AerialImpedance:
75 unbalanced,Coaxial type
TuningSystem:
21Systems
FrequencySynthesizer
AutoSearch
100(Position)/125(Direct)
Receiving Channels:
VHF Band 2-12(PAL/SECAM-B,K1)
0-12(PAL-B AUST.)
1-9 (PAL-B N.Z.)
1-12(PAL/SECAM-D)
1-12(NTSC-MJAPAN)
2-13(NTSC-MU.S.A.)
UHF Band 21-69(PAL-G,H,I)
21-69(SECAM-G,K,K1)
28-69(PAL-B AUST.)
13-57(PAL-D,K)
13-62(NTSC-MJapan)
14-69(NTSC-MU.S.A.)
CATVS1-S20(OSCAR)
S21-S41 (HYPER)
1-125(U.S.A.CATV)
5A, 9A(AUST.)
Z1-Z37(CHINA)
C13-C49(JAPAN)
Intermediate Frequency:
Video38.0MHz
Sound31.5MHz(D, K)/32.0MHz(I)
32.5MHz(B, G)/33.5MHz(M)
Colour33.57MHz(PAL)/33.6MHz(SECAM)
33.75MHz(SECAM)/34.42 MHz(NTSC)
Receiving Stereosoundsystem:
NICAMB/G,NICAMI,
NICAMD, A2(German)
ScreenSize:
Type51 Type43
Diagonal: 296 mm1092 mm
Height:780 mm655 mm
Width:1037 mm874 mm
Projection Tube:
Type51 Type43
TVVAB10GAV (B-ASSY)TVVAB10GLV(B-ASSY)
TVVAG10GAV (G-ASSY) TVVAG10GLV(G-ASSY)
TVVAR10GAV (R-ASSY)TVVAR10GLV(R-ASSY)
90°deflection
High Voltage:

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5SelfCheck
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1.Self-Checkisusedtoautomaticallycheck thebuslinesand hexadecimalcodeoftheTVset.
2.Togetinto theSelf-Checkmodepressthedown(
)button on thecustomercontrolsatthefrontoftheset,atthesametimepressingtheHELP
button on theremotecontrol,and thescreenwill show:
IftheCCUportshavebeencheckedand found tobeincorrectornotlocatedthen “--”willappearin
placeof“O.K.”.
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7.1DynamicFocusAdjustment
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1.Focusadjustmentsshouldbeperformedafter1hourofaging.
2.Useoscilloscopewith100 :1probe.
3.Applymonoscopepattern.
4.AdjusttheRed,Blueand GreenfocusVRon thefocusblockforbestfocusofoverall picture
ofeachCRT.(Fig.2)
Fig. 2
5.ConnectthescopeprobetoTPD20,GND toTPD21.Scopesetat20V/div&5msec./div.
6.AdjustV-PARA(Servicemode1)sothatwaveform(A)is380V±20V.(Fig.3)
7.AdjustH-PARA(Servicemode1)sothatwaveform(B)is560V±40V.(Fig.3)
Fig. 3
8.ProceedwithFocusAdjustments.
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7.2ElectricalFocusAdjustment
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1.Receiveamonoscopepattern.
2.CovertheRedand BlueCRT,projectingGreenonly.
Theelectricalfocuscontrolsarelocatedon thefront.AdjusttheGreenFocusVRforbest
focusofoverallpicture.(Fig.2)
3.RepeatforRedfocusVRwhileprojectingRedonly.
4.RepeatforBlue.(Bestfocusatbottomleftcornerofscreen)
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7.3Optical LensFocusAdjustment
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Note:
Thisadjustmentnormallyshouldnotrequireresettingunlessthelenshasbeenreplacedor
adjustmenthaschanged.
1.Opticalfocusadjustmentislocatedon thetop ofeachCRTlenssystem. Loosenthe
adjustmentknurlslockingknob.(Fig.4)
Fig. 4 (Rearview)
2.TurntheReceiverON applyand viewamonoscopepattern.
3.AdjusteachlensfocusforbestfocuswhileviewingeachCRT.
4.CovertheRedand BlueCRT,projectinggreenonly.RotatetheGreenlensforbestfocus
around screencenterarea.
5.DothesamefortheRedfocuslenswhileprojectingRedonly.
6.RepeatforBlue.
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7.4CenteringMagnetAdjustment
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1.Receiveamonoscopepattern.
2.ConfirmthatCoarseconvergencedata(Servicemode1)forR,Gand Bis0.
3.SetthatFineconvergencedata(Servicemode1)isclear(no correction).
4.SetthatV-Posdata(Servicemode1)is[100].
5.SetthatH-Posdata(Service mode1)is[55].
6.SetthatH-Paralleldata(Servicemode1)is[8].
Procedure:
1.CovertheRed, BlueCRTlens,projectingGreenonly.
2.Adjustgreencenteringmagnet(DY)iftheprojectedgreen horizontal/verticallinedoesnot
lineup withthescreenhorizontal/verticalcenterline.
3.CovertheGreen,RedCRTlens,projectingBlueonly.
4.Repeatstep2.forblue.
5.CovertheGreen,BlueCRTlens,projectingRedonly.
6.Repeatstep2.forred.
7.CovertheRed, BlueCRTlens,projectingGreenonly.
8.Adjustgreencenteringmagnetsuntilthecenterofthemonoscopepatternlineup withthe
screencenterline.
9.CovertheGreen,RedCRTlens,projectingBlueonly.
10.Adjustbluecenteringmagnetstoposition thecenterofthebluerasterW2awayfromthe
centerofthegreenraster.
11.CovertheGreen,BlueCRTlens,projectingRedonly.
12.Adjustredcenteringmagnetstoposition thecenteroftheredrasterW1awayfromthecenter
ofthegreenraster.

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7.5Alignment magnetAdjustment
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Preparation:
1.Receiveancrosshatchpatternwithdots(pincushion).
2.Loosenthecenteringmagnetsscrews.
3.Positionthelongertabofthefour-polemagnetto90 degrees(uncorrectedposition).
VMCoilwith focuscorrection magnet
4-polemagnet
4.Positionthelongtabofall alignmentmagnetsand ofthedummyringtogetherinan
uncorrectedposition.
Alignmentmagnet(ordummyring)
Procedure:
1.Receiveancrosshatchpatternwithdots.
2.CovertheRed, BlueCRTlens,projectingGreenonly.
3.TurnthegreenelectricalfocusadjustmentVR(on focuspack)fullycounterclockwiseand note
theposition ofthedotsatthecenterofthepicture.
4.TurnthegreenelectricalfocusadjustmentVRfullyclockwise.
5.Adjustthefourpolemagnetsuntiltheshapeofthedotatthecenterofthescreeniscircular.

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6.AdjustforbestgreenelectricalfocuswithgreenelectricalfocusadjustmentVR.
7.CovertheGreen,RedCRTlens,projectingBlueonly.
8.Repeatstep4.~step6.forblueelectricalfocus.
9.CovertheGreen,BlueCRTlens,projectingRedonly.
10.Repeatstep4.~step6.forredelectricalfocus.
11.Receiveanmonoscopepattern.
12.CovertheRed, BlueCRTlens,projectingGreenonly.
13.Ifthecenterofthemonoscopepatternisnotinsidethe15mm circle,showninbelow,adjust
thecenteringmagnets.Repeatthealignmentmagnetadjustmentsand fourpolemagnet
adjustments(step1.~step6.)
Centering magnetadjustment
14.CovertheGreen,BlueCRTlens,projectingRedonly.
15.Repeatstep13.forthered.
16.CovertheGreen,RedCRTlens,projectingBlueonly.
17.Repeatstep13.fortheblue.
18.Followingadjustments,fixthecenteringmagnetsofDY,dummyringsofVMcoil,fourpole
magnetsofVMcoil and thealignmentmagnetsofVMcoil topreventthemfrommoving.
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14 Schematic Diagram
14.1. Schematic Diagram Notes
67