Sea Tel 6006C User manual

Field Service Procedure - Replacement Pol Pot Kit, 6006C, 6009C,
9597B & 9507
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Page1of7
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Document No
135302 Rev B
Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea
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polpotonthe6006C,6009C,9597Band
9507seriesantennas.
2. Checklist:

VerifyRangeofMotion
VerifyPotFeedback
MeasureResistance
3. TheoryofOperation:
Apolangpotentiometerisusedtoprovideafeedbackreferenceforthepositionofthefeedassemblyforlinear
polarization.Thepotactsasapotentialdividergivinganoutputvoltagewhichvariesfrom0Vdcto5Vdc.ThePCU
convertsthevoltageoutputfromthepotintothenumericalvaluedisplayedontheDAC.Afailurewiththepotcausingit
tooutputanincorrectvoltage,willresultinthefeedassemblynotbeingalignedcorrectlycausingbadcrosspolisolation.
Oneindicationthatthereisafaultwiththefeedalignmentofthesystemisthatthetargetlightwillbepermanently
illuminatedontheDACandtheantennawon’ttargetcorrectly.Itwillsit8degreesabove(or8degreesbelowathigh
elevations)thesatelliteselevationlookangle.Aspartoftheantennastargetingprocedurethesystemwillcalculatethe
thresholdvaluebasedonthenoisefloorlevelandthenalignthefeedforthecorrectreceptionpositionbasedonthe
vesselsGPSpositionandthelookuptableintheDAC.
Ifthesystemisunabletodrivethepolmotortoobtainthecorrectfeedback,orifthepothasfailedandwon’tgivethe
correctfeedback,theantennacan’tcompletethetargetprocessandtheantennawillstayinthisposition.Settingthepol
typeto“0009”willmaketheantennatargetbyremovingtheautopolfunctionfromthetargetingprocess;howeverthe
missalignmentofthefeedwillcausebadcrosspolisolation.
4. VerifyRangeofMotion:
FirstverifythesettingsintheDACarecorrect,thepolscaleshouldbesetto0090togivethefeed180degreesofmotion.
Thedefaultpoloffsetis0030(howeverthesemayhavebeenmodifiedslightlyto“trim”thepolangle).Turntrackingoff
(ifapplicable)anddrivetheelevationto0degreestomakeiteasiertoviewthefeedassemblyfordiagnosticpurposes.
SetthepoltypesettinginthesetupmenuoftheDACto“0009”tosetthemodeofthepolassemblyfromautomaticto
manual.Nowenterthepolwindow(aftertherelativewindowinthe“antenna”screenoftheDAC)andholdthedown
arrowtodrivethefeedassemblyintoitsendstop.Atthelowerendoftherangethepolcountshouldbeapproximately
28,atwhichpointthepolangstopplateonthefeedshouldbehorizontalfacingtotheright(whenlookingfaceontothe
feed).
IfnopolmotordriveispresentverifythepolreadingontheDACisn’toutofrange(i.e.displayingavalueofeither0or
255).Ifoneofthesevaluesaredisplayeditspossiblethepotisn’talignedcorrectlyandthatadjustingitmaybringitback
withitsrangeofoperation.Backthepotofffromthemaingearsprocketandrotateitspulley,verifythatthefeedback
valuechangesontheDAC.Ifso,calibratethepolpotandverifyoperationasdescribedinthelaterstagesofthis
document.IfthepolcountontheDACdoesn’tchangewhenthepotisadjustedthepothasfailedandisoutputtinga
defaultvalue.SeeVerifyingtheResistanceofthePolPotsectionbelow.Ifthisisthecasenodrivewillbeissuedtothe
polmotorasthevalueisoutoftherangewhichthesystemoperatesin.


Field Service Procedure - Replacement Pol Pot Kit, 6006C, 6009C,
9597B & 9507
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
Document No
135302 Rev B
Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea
Tel, Inc.. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc. 

5. VerifytheResistanceofthePolPot:
Thepolangpotentiometer(polpot)consistsofaninternalslideraswellasaCWandCCWcontact.Toverifythe
resistanceofthepotamultimetercanbeusedtomeasurebetweenthesliderandoneofthewiperswhilstrotatingthe
shaftthroughitsrangeandverifyingthe0–5Kohmsisoutputtedcorrectly.DisconnectJ1frommotorterminationPCB
assembly.



Lookingdownontotheshaftofthepotrotateitclockwiseuntil
itreachesitsendstop.
NowmeasuretheresistancebetweenthesliderandtheCW
contact(redcable,pin3ontheIDCconnectorandthegreycable
pin2ontheIDCconnector).
Thefeedbackshouldbeapproximately0kohms.


Nowslowlyrotatetheshaftofthepotcounterclockwise,the
readingshouldcountupsequentially.Afterfiveturnsthepotwill
beinthecentreofitsrangegivingaresistanceofapproximately
25kohms.



Continuetorotatethepotuntilthecounterclockwiseendstop
(itwillnowhaveturnedthroughall10rotationsofitsrange),the
resistanceshouldbeapproximately5kohms.

Leavingthepotatitscounterclockwiseendstopmeasurebetweentheclockwisecontactandtheslider(greycable,pin2
ontheIDCconnectorandthebrowncablepin1ontheIDCconnector)theresistanceshouldbereversedfromthe
previousrotation,reading0ohms.Rotatingtheshaftofthepotclockwiseshouldincreasetheresistancethroughits
rangeto5kohms.Anyerrorwiththepotnotgivingthecorrectresistanceisanindicationthepotisdefectiveandneeds
replacing.
 

Field Service Procedure - Replacement Pol Pot Kit, 6006C, 6009C,
9597B & 9507
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Document No
135302 Rev B
Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea
Tel, Inc.. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc. 

6. PolPotReplacementProcedure:
6.1. Tools.

Snips/Cutters
9/64”AllenWrench/Key
3/32”AllenWrench/Key
12mmWrench/Spanner
Loctite222,242and638
CableTies
6.2. Procedure.
ProcedureforreplacingthePolPotonthe6009C,9597Band9507linearC‐Bandsystems,SeaTelkitpartnumber:
134919(potpartnumber:115425‐5).

*CAUTION:Powerdownthepedestalbeforefollowingthis
procedure.

1.Cutthecabletiessecuringthepolpotharness.


2.DisconnectthepolpotIDCconnectorfromthetermination
block.


3.Usinga9/64”Allenwrench,removethepotassemblyfromthe
feed.


Field Service Procedure - Replacement Pol Pot Kit, 6006C, 6009C,
9597B & 9507
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Document No
135302 Rev B
Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea
Tel, Inc.. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc. 


4.Installthemountingbracketontothepolpotusinga12mm
wrench.
5.ApplyLoctite638totheshaftofthepotandinstallthepulley,
applyLoctite222tothesetscrewandinstallusinga3/32”Allen
wrench.




6.ApplyLoctite242tothemountingscrewandinstallthe
replacementpolpotassembly.Donotfullyengageatthistime.



7.Securethepolpotharnesswithcabletiesandreconnectthe
IDCconnector.
8.Followthebelowprocedureforcalibratingthepot.




Field Service Procedure - Replacement Pol Pot Kit, 6006C, 6009C,
9597B & 9507

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
Document No
135302 Rev B
Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea
Tel, Inc.. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc. 

7. PolPotAlignmentandVerification:

1. Drivethereflectortozerodegreesofelevationtoviewtheorientationofthefeedassembly:
Pressthebuttontoturnthetrackingfunctionoff(ifapplicable)topreventtheantennafromgoingintoa
search.Pushthebuttonuntilthe‘Antenna’windowisdisplayed(thescreenwillshowtheAZ,ELandREL
values).Pressthebuttontwicetoisolatethe‘EL’windowandthenpressthearrowtoactivateit(acursor
willbedisplayed).Nowusetheandarrowkeystoscrollthecursoralongandusetheandarrowkeys
tochangetheelevationvalueto“00.0”andpressthebutton.

2. SetthePolangTypetomanualmode:
Enterthe‘SetupMenu’modebypressingandholdingthearrowkeystogetheruntilthe‘ELTrim’or‘Auto
Trim’windowisdisplayed.Pushthearrowkeyuntilthe‘PolangType’windowisdisplayed.Pressthearrow
keytoactivatethewindow.Nowusetheandarrowkeystoscrollthecursoralongandusetheand
arrowkeystochangethecharacters.Setthe‘PolangType’to“0009”whichismanualmodeandpressthe
button.

3. Pressthebuttontogotothe‘PolOffset’windowandverifythedefaultsettingis“0030”fora9597Bor9507
or“0040”fora6006Cor6009C.(Ifnecessaryusearrowkeystoselectappropriatedigitsandchangeaccordingly).

4. Nowkeeppressingthebuttonuntilthe‘Antenna’windowisdisplayed(thescreenwillshowtheAZ,ELand
RELvalues).
5. Pressthebutton4timesuntil‘Polxxx’isdisplayedandthenpressthearrowkeytoactivatethewindow.
6. Nowholdeithertheorarrowkeytodrivethepoluntilacountofeither“130”forthe6006Cor6009C,or
“120”isdisplayedforthe9597Band9507pedestals.

*Note:It’sadvisabletohavesomeonewatchingthefeedwhileit’sbeingdrivenasifthepotisn’tcorrectly
calibratedthereisthepossibilitytodamagetheassemblyiftheLNBhitsthepolmotororthereflectorharnessis
coiledaroundthefeed.

7. Observethephysicalalignmentofthefeed:
TheRXwaveguideshouldbefacingdownwardswiththeTXrejectfiltertotheright,verticallywiththeLNB
horizontallyabovetheassemblywiththecoaxexitingtotheleft.Laterrevisionsofthissystemuseanadditional
lengthofwaveguidewiththefilterabovetheassemblyhorizontally,andtheLNBfacingdownwardsontheleftside
(asshownonthebelowimage).


Field Service Procedure - Replacement Pol Pot Kit, 6006C, 6009C,
9597B & 9507

Page6of7

Document No
135302 Rev B
Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea
Tel, Inc.. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc. 

*Note:LNBnotshownforclarity.



(Steps8‐12requiresassistancetoobserveandoperateantennasimultaneously)

8. UsingtheDAC‐2202drivethefeedsotheRXwaveguideexitsvertically.
Pressthearrowkeytoactivatethecursoronthepolwindow.Nowholdeitherthe orarrowkeytodrive
thepolmotoruntiltheRXwaveguideisfacingdownwards.Nowpressthebuttontode‐activatethe
window.
9. Locatethepolpotentiometeronthefeedandloosenthescrewthatsecurestheslottedmountingplatewitha9/64”
Allenwrenchandcarefullymovethepolpotgearoutofalignmentwiththebelt(fig.1.1).

(Fig.1.1)
10. Alignthepotentiometer:
OntheDACverifythecursorisnotdisplayedonthepolwindow,ifitispressthebutton(failuretodothiswill
resultindisplaynotchanging).Nowrotatethepotsprocketmanuallyuntilacountofeither120forthe9597Band
9507or130forthe6006Cand6009Cisachieved,dependingonyourantennamodel.Nowreinstallthepotonthe
mainsprocket.
*Note:Whenre‐installingthepotontothebelt,itiscommonforthereadingtochangeastheteethareengaged.
Oncethepothadbeeninstalledrecheckthepolvalueandadjustifnecessary.Duetothebelt/sprocketalignmentof
thepotthetoleranceis+/‐2degreesso118‐122countsforthe9597Band9507and128‐132forthe6009C.


Field Service Procedure - Replacement Pol Pot Kit, 6006C, 6009C,
9597B & 9507
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Page7of7
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Document No
135302 Rev B
Copyright © Sea Tel, Inc 2011 - The information contained in this document is proprietary to Sea
Tel, Inc.. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc. 
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11. Drivethepolmotortoitsupperandlowerelectricallimitsandverifytheassemblydrivesinthecorrectdirectionand
thatthefeedassemblyhas180degreesofrotation:
OntheDACpressthearrowkeytodisplaycursorunderneaththepolvalueandthenpressandholdthe
arrowkeytodrivethefeedtoitsupperendstop.Verifytheassemblydrives90degreessotheexitoftheRXwave
guideishorizontal,facingtheleftwiththeLNBnowverticalwiththecoaxfacingupwards(providedtheLNBwas
horizontalinthepreviousstep,dependingontheconfigurationoftheantenna).Thepolreadingshouldbe
approximately211counts.
Nowpressandholdthearrowkeytodrivethefeedtoitslowerendstopandverifythefeedrotates180
degrees,withtheexitoftheRXwaveguidehorizontallyfacingtheright,andtheLNBnowverticalwiththecoax
facingdownwards(dependingontheconfigurationoftheantenna).Thepolreadingshouldbeapproximately28
counts.

12. SetthePolTypetoAutomatic(autopol):
Pressandholdthearrowkeystogetheruntilthe‘ELTrim’or‘AutoTrim’windowisdisplayed.Pushthe
arrowkeytoscrollthroughthesettingsuntilthe‘PolType’windowisdisplayedandpressthearrowkeyto
activatethewindow.Nowusetheandarrowkeystoscrollthecursoralongandusetheandarrow
keystochangethevaluefrom“0009”to“0072”andthenpressthebuttontoputthesystembackinto
automaticpolang(autopol)mode.
WatchtheLNBandverifyitreturnstothecorrectreceptionposition(whilethepolmotorisdrivingthetargetlight
willbeilluminatedontheDAC).
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13. SavethesettingsintheDAC‐2202:
Pressandholdthearrowkeystogetherbriefly,“SaveNewParameters”willbedisplayed.Pressthe
arrowkeytoactivatethewindowandthenpressthebutton,“ParametersSaved”willbedisplayedandthe
poltypeandpoloffsetwillbestoredintheDAC.

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*Note:IfmakingadjustmentstothepolarizationalignmentofaVSATantennacontactingtheNOCtorunthrough
across‐polisolationtestandcalibratingthePolOffsetwillbenecessary.
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