Sea Tel 6003A Manuale utente

Field Service Procedure – Replacement Level Cage Motor Kit, XX04 &

6003A/6004

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Page1of5

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Document No

135290 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



1. BriefSummary:

TroubleshootingdocumentfordiagnosingafaultwithandreplacingthelevelcagemotorontheXX04and6003A/6004

seriesantennas.

2. Checklist:

VerifyInitialization

VerifyPointing

VerifyTargeting

3. TheoryofOperation:

ElevationdriveoccursfromoffsettingthelevelcagewhichintroduceserrorintothePCU’scontrolloop,theelevation

motorwillthendrivetheaxistobringthelevelcagebacktolevel,removingtheerrorandinturnchangingtheelevation

lookangleoftheantenna.Ifthelevelcagemotorisdefectiveitwillpreventthesystemfromtargetingthecorrect

elevation,bynotoffsettingthelevelcagethecorrectamountandthereforecausingtheelevationtargetingerror.

Asignthatthelevelcagemotorisfaultyisthesystemkeepsfindingthesatelliteatdifferentelevationpositionsandthe

trimsneedadjustingtocompensateforthis.Anotheristhesystemmis‐pointscompletelyandthelookangleofthe

antennadoesn’tcorrespondwiththevaluedisplayedontheDAC.Whatisactuallyhappeningisthemotorisn’toffsetting

thelevelcageproperly,thereforethesystemisn’ttargetingcorrectlyTheDAC,however,willdisplaythedesiredtarget

positionasthereisnolivefeedback.

4. VerifyInitialization:



Powercyclethepedestal

1. Levelcagedrivestoitsendstop,thenbacksoffexactly45degrees

2. Elevationaxisdrivestolevelbasedonthelevelcage’shorizonreference

3. Crosslevelaxisdrivestolevelbasedonthelevelcage’shorizonreference

4. Limitedazimuthsystemsdriveclockwiseintotheazimuthendstop,thenbackoffto630degreesof

relative



Verifyifthelevelcagemotordrivescorrectly,ifnotthenthesystemwon’ttarget45degreesofelevationduringthe

initializationprocess.

IftheACUreportsmodel"xx03/xx04",theantennasN0parameterneedscalibratingandverifyingthatthePCUsavesit

correctly.Adriveissueorpedestalerror(error8)requiresfurthertroubleshooting.



Field Service Procedure – Replacement Level Cage Motor Kit, XX04 &

6003A/6004

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Page2of5

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Document No

135290 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



5. VerifyPointing:

Drivetheantennathroughoutitselevationrangeandverifyitpointscorrectly.Target0,45&90degrees,makingsure

thereflectorisatthecorrectpositiondisplayedontheDAC.

6. VerifyTargeting:

Iftheantennaappearstopointcorrectlyamoreaccuratewaytoverifythisistoseeifitcanrepeatedlytargetthecorrect

elevationofasatellite.Trimthesystemtothecorrectelevationandthenpointtheantennaawayfromthesatellite.Now

targetthedesiredsatelliteandverifythesystemtargetstowithin0.5degreesofthecorrectelevation.

Anyerrorintheabovestepsisanindicationthelevelcagemotorisdefective.

7. TesttheMotor:

Thesteppermotorcanbeverifiedbymeasuringresistanceacrossthefollowingconnections:



Pin1to3=38ohm

Pin2to3=38ohm

Pin5to4=38ohm

Pin6to4=38ohm

Pin1to2=76ohm

Pin5to6=76ohm



Ifoneofthemeasuringpointsisopen(noresistance)themotorisdefectiveandneedstobereplaced.Alsomeasurefrom

allthepinstoground(themetalcaseofthemotor)theymustbeopen,notshorted.



Field Service Procedure – Replacement Level Cage Motor Kit, XX04 &

6003A/6004

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Page3of5

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Document No

135290 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



8. FurtherInformation:

Nowthemotorhasbeenreplacedverifythesysteminitializesproperly,hasthecorrectrangeofmotionandtargetsthe

correctelevationvalues(iftheelevationtrimwasadjustedbecauseofthetargetingerrorthiswillneedresetting).

IfthetargetingissuestillpersiststhereisthepossibilitythatthedriverforthelevelcagemotoronthePCUmotherboard

hasfailed.TestthefourtransistorsonthePCUmotherboardfordamageasperthebelowimage.



Setyourmulti‐metertotheDiodesettingandtestbetweenthepinsofthetransistorsasperthefollowing

procedureandverifytheresults.



Pins1(+)and2(‐)=LO

Pins1(+)and3(‐)=0.66V(+/‐0.03)

Pins1(‐)and3(+)=LO

Pins1(‐)and2(+)=0.66V(+/‐0.01)

Pins3(‐)and2(+)=0.66V(+/‐0.01)

Pins3(+)and2(‐)=LO



2



13



AnyreadingsshortedtogroundoroutoftheabovetolerancesmeanthetransistorisdefectiveandthePCUneedstobe

replaced(ifthisisthecaseit’spossibletheoriginalmotorisnotdefective).

Ifthesystemisdisplayingapedestalerror(error8)thenthereisadriveissuewiththeantennaandattentionwillneedto

bepaidtothemotorandmotordriverfortherelevantaxis.



Field Service Procedure – Replacement Level Cage Motor Kit, XX04 &

6003A/6004

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Page4of5



Document No

135290 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



9. ReplacingtheLevelCageMotor:

9.1. Tools.



2mmFlatBlade(Terminal)Screwdriver

#1PhillipsScrewdriver

#2PhillipsScrewdriver

½”Wrench/Spanner

Loctite222,242and638



9.2. Procedure.

Procedureforreplacingthelevelcagemotor,SeaTelpartnumber:124115‐2(levelcagemotorpartnumber:116059‐

2).



*CAUTION:Powerdownthepedestalbeforefollowingthis

procedure.

1.Usinga2mmflatbladescrewdriverloosentheretainingscrews

fromtheD‐subconnector&removethereferenceharnessfromthe

levelcage.

2.Usinga#1Phillipsscrewdriverloosen(don’tfullyremove)the4

screwssecuringthelevelcagemotorandpushthemotortowards

thelevelcage.

3.Nowusinga½”wrenchundotheNylocknutandremovethe

levelcageassembly.

4.Usinga#2Phillipsscrewdriverremovethefourscrewsattaching

theELpancovertothePOLAUXRelayassembly(oneoftheseis

locatedbehindthelevelcageasshown)andremovethesixscrews

&twoP‐clampsattachingtheouterELpancovertotheinsideEL

pancover.



6.SlidetheELPancovertotheleft&carefullyremoveittoexpose

thelevelcagemotorwiringharness&disconnecttheIDCconnector

frommotorterminationPCB.



Field Service Procedure – Replacement Level Cage Motor Kit, XX04 &

6003A/6004



Page5of5

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Document No

135290 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



7.Usinga#1Phillipsscrewdriverremovethefourscrewssecuring

themotortotheELpan&savethehardwareforfutureuse.

8.ApplyLoctite638totheshaftofthereplacementmotorandfit

thepulleyinthesamepositionastheoneonthedefectivemotor.

FitthesetscrewsintothepulleywithLoctite222.

*Note:ForfurtherinformationrefertotheLoctiteProcedure

121730providedwiththiskit.

9.InstallthereplacementlevelcagemotorintotheELpanwiththe

beltaroundthesprocketandlooselysecurethemotor.



10.ConnecttheIDCconnectorintothemotorterminationPCB&

re‐InstalltherightELpan.

11.ApplyLoctite242tothehardware&reinstallall10screws

makingsurethelonger2screwsareusedontheP‐clipswhich

securethereferenceharness.

12.Refitthelevelcage,aligningitsendstopssoithas90degreesof

rotationfromhorizontaltovertical.InstalltheNylocknutremoved

earlierandconnectthereferenceharnessintotheD‐subconnector,

tighteningtheretainingscrewsusinga2mmflatbladescrewdriver.



13.Verifythelevelcagehas90degreesofmovementwithoutthe

referenceharnessbeingpulledtaught.

14.Tensionthebeltbyslidingthemotorassemblybyhandaway

fromthelevelcage&tightenoneofthefourscrews.



15.Increasethebelttensionuntilthebeltcanonlybeeasilytwisted

just¼turnwithyourfingers.

16.Ifthebelttensionistootight/loose,adjustuntilcorrect&then

securethemotor.

17.Ifthebelttensioniscorrecttightenthe3loosescrews.



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