Sharp SD-AT1000W Especificações descarregar pdf (Página 244)

Section-5 Maintenance

October 17, 2013

5‐64

WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004

STEP 7 Replacethefrontpanelandfingertightenthefasteners.Donotusea

screwdrivertotightenthethumbscrews.

STEP 8 Endofprocedure.

5.10.3 OperationWithInoperativeModules

ThePABPAmodulerejectloads,locatedinsidethePABmodulecombiner,aresizedwithenoughmargintoallow

operationunderanyimbalanceconditionthatmaybeencountered.AslongasonePABmoduleandonePSmodule

areinstalledandoperationalthepowerblockwillcontinuetoproduceRFpowerbu

tatreducedlevels(theoutput

leveldependsonhowmanyPABmodulesareremoved).

Removalofanac

tiveLPUPAmodulerequireswillcausethetransmittertostopproducingRFsincePABRFinputwill

belost.

5.10.4 PAModuleBias

Re‐biasofthePAmodulesisnotrequiredontheMaxivaUAXseriestransmitters.

5.10.5 PAModulePhasing

PhasingofthePAmodules(andthepalle tinsidethem)istightlyc on tr o lle datthefactory .NophasingofthePAmodules

isrequiredinthefield.PAmodulescanbeuse dinanylocationwi thout re‐phasing.

Note

Phasing between PABs is required to minimize PAB combiner reject power and it is accomplished via the

cables that go to the PAB combiners. The cables to the PAB combiners must be identical in length for

proper combining and maximum output power.

5.10.6 PSModuleRemovalandReplacement

STEP 1 LoosenthumbscrewonfrontofPSmoduleandcarefullypullthemoduleout

oftherack.

STEP 2 Inspecttheconnectorsontherearofthereplacementmoduletobesure

thereisnodamagetothePSconnectors.

STEP 3 InspectthePSconnectorsinsidetheracktoconfirmthereisnoblockageor

damageonrackconnectors.

STEP 4 SlidethePAmodulegentlyintotherack(handledown)untilcontactismade

withthematingconnectors.

STEP 5 Pushevenlyonthemodulehandle(usetheoutsideedgesofthehandleto

avoiddeformingthehandleinthecenter)withaslightsidetosidemotionto

helpalignthematingconnectors.

STEP 6 FingertightenthePSmodulethumbscrew.Donottightenthumbscrewwith

ascrewdriver.

STEP 7 Endofprocedure.

5.10.7 VerificationofFailedFET

EachPAmodulecontainsonePApalletboard.EachpalletcontainstwoFETs.InordertoidentifyafailedFETusethe

followingprocedure:

STEP 1

RemovethePAmodulefromthesystem.Allowittocoolifitishottothe

touch.

STEP 2 RemovethePAmodulecover.

STEP 3 Useavoltmeter(Fluke87forexample)tomeasuretheresistancebetween

theFETgatesandground.

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