Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 210)

Section-5 Maintenance

October 17, 2013

5‐30

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

Figure 5-18 FWD cable direct to REF port

STEP 15

Thesystemwillnowpromptyoutoreconnectthecablesintheiroriginal

configuration(FWDtoFWD,RFLDtoREV)bef oreproceeding.Ifyouforgetto

performthisstep,thesystemwillmostlikelyimmediatelygointoVSWR

foldbackwhenyouattempttoreturntonormaloperation.

STEP 16 Proce dur ecomplete.

5.6.3.2 CalibrationErrors

If,uponcompletionofthecalibrationsequence,them essage"CalibrationError"isdisplayed,repeattheprocedure

andnotethedisplayeddetectorADCvalue.Ifyouareabletoobtainthespecifiedforwardoutputpowerlevelas

indicatedonyourmeter,buttheADCisindicatingnear‐zerovalues,oriftheAD

Cvalueatthehighpointequals(oris

lessthan)thevalueatthelowpoint,thesystemwilldiscardthecalibration.Inthiscase,afterraisingthesystem

outputtothelevelindicated,checktheactualpowerpresentattheFWDsamplecable(rememberturnoffthe

powermeter ’soff

set.)Youshouldhaveapproximately0dBmatthispoint(thecableendthatconnectstotheLPU

input)atfullsystemforwardpower.Ifyoudonot,pleaseverifythecabling,workingstepbystepfromtheLPUend

backtowardsthecoupler.

Ifan

yPAsarefaultedduringthecalibration,thesystemwillconsideritinvalidanddiscardit.ReplaceanyfaultyPAs,

andperformthecalibrationagain.

5.6.4 CalibrateUDCOut

UDCreferstotheoutputoftheupdownconverterboard(modulatorsectionoftheLPU)ontherearoftheLPU.This

isafemaleSMAconnector.

STEP 1

ZeroandcalibrateRMSpowermeter,followingtheapplicable

manufacturer’sproceduresforspecificmodel.

Note

The power meter reads average power. Conversion to peak visual power is required. See Section 5.6.1 on

page 5-21 for methodology.

STEP 2

LocatetheUDCSMAconnectorontherearoftheLPUtobecalibrated(lower

left),removetheRFcable,andconnectthepowermeterprobe.

STEP 3 Connectthevideosourcetothevideoinputofthetransmitter.Setvideo

sourcetoblackpicturewithzerosetup.

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Sharp SD-AT1000W Especificaciones Pagina 210