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Section-5 Maintenance

October 17, 2013

5‐42

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

Figure 5-25 TCU Display Reset Switch

Thepa

nelPCdisplayunitcanalsoberebootedintheeventofaproblembyswitchingitoffforfifteensecondsand

thenbackon.AnON/OFFrockerswitchislocatedjustbehindtheTCUfrontpanelassemblyandcanbeaccessedby

pullingthedisplaydownwardandreachingintotheopeningbehi

ndthepanel.Therockerswitchislocatedonthe

leftsideofthedisplayunit(behindthefiltermaterial)onthesideofthedisplaycase.SwitchingthepanelPCoffand

backondoesnotdisrupttakethetransmitteroff‐air.

5.9 LPUMaintenance

ThissectionisamaintenanceguidetotheLPU(LowPowerUnit).

5.9.1 LPUExciter/ModulatorMaintenance

TheLPUexciter/modulatorsectionislocatedintheupperpartoftheLPU.TheairintakefortheLPUexciter/

modulatorsectionislocatedontheupperleftandrightsidesofthefrontpanel.Theairfilterislocatedbehindthe

LPUfrontpanel(seeFigure5‐27onpag

e5‐43).Toreplacethefilters,ortoaccesstheLPUfrontEthernetconnection,

PSorPAmodulesthefrontpanelfastenersmustbeloosenedandthefrontpanellowered.

Theto

pcovercanberemovedtoprovideaccesstothecircuitboards.

TheLPUmodul

atorsectionconsistsofninecircuitboards,whichareasfollows.

• SignalProcessorBoard

• PreciseFrequencyReferenceUnitBoard

• UpDownConverterBoard

• PowerSupplyandLowVoltageDistributionBoard

• BatteryBackupOptionBoard

• FrontPanelLEDandSwitchBoard

• TransmitterI/OInterfaceBoardoptionispiggy‐backedundertherightrearsideofthesignalprocessorboard.

ThisboardcanbeinsertedandremovedthroughtherearpaneloftheLPU.

• AnalogTransmitter(V ideo)InputBoardoptionispiggy‐backedundertherearofthesignalprocessorboard.

ThisboardcanbeinsertedandremovedthroughtherearpaneloftheLPU.

• AnalogAudioInputBoardoptionispiggybackedundertheanalogtransmitter(video)inputboard.Thisboard

canbeinsertedandremovedthroughtherearpaneloftheLPU.

Figure5‐26showstherea

rpaneloftheLPUwithitsconnectors.

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