Section-5 Maintenance

October 17, 2013

5‐44

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

5.9.3 LPUPAandPSModuleReplacement

Note

The module(s) in the LPU chassis are hot-pluggable. It is not necessary to remove AC mains power before

removing or inserting a module. If active the LPU will go off air upon removal of a module.

STEP 1 OpenLPUchassisfrontdoorbylooseningthefourthumbscrewsondoor.

STEP 2 Loosentheretainingthumbscrewsfortheaffectedmodule.

STEP 3 Removemodule.

STEP 4 Verifythatpartnumberofreplacementmodulematchesthepartnumberof

themodulebeingreplaced.

STEP 5 Insertreplacementmodule.

STEP 6 Securethereplacementmodulebytighteningtheretainingthumbscrew(s).

STEP 7 PresstheONbuttonontheLPUorTCU(whereapplicable)torestartthe

modules.

STEP 8 Performa functionalchecktoverifytransmitterisworkingcorrectly.

STEP 9 Procedurecomplete.

5.9.4 LPUFron tFanReplacement

Therearetwo12VDCfansintheupperpartoftheLPU(seeFigure5‐27onpage5‐43).Mainspowermustbe

removedfromtheunitandtheunitremovedfromthecabinetinordertochangethefans.Thus,analternateLPU

mustbeusedtoremainon‐airduringthismaintenanceoperation.ThetopoftheLPUmustberemovedtogain

accesstothefans.

Caution

THE FAN MAY CONTINUE TO ROTATE FOR SEVERAL SECONDS AFTER

REMOVAL.

RefertoTable3‐15onpage3 ‐23torelatefannumberingtoGUIicons.

5.9.5 LPURearFanReplacement

Therearethree50VDCfansintherear,lowerhalf,oftheLPU(seeFigure5‐26onpage5‐43).Thefansoperate

continuously(atvariablespeeds) wheneverthetransmitterison.Thefanscanberemovedwhilethetransmitter

continuesoperating,providingthatareplacementfanisinstalledasqu

icklyaspossible.Disconnectthedcsupply

connectorbeforeremovingfan.UseaA#2screwdriverisneededtoremovethefourscrewsthatattachthefansto

theLPUchassis.

Caution

THE FAN MAY CONTINUE TO ROTATE FOR SEVERAL SECONDS AFTER

REMOVAL. FANS MAY ALSO STARTUP AS SOON AS THEY ARE PLUGGED IN

IF TRANSMITTER IS ON.

RefertoTable3‐15onpage3 ‐23torelatefannumberingtoGUIicons.

1 2 ... 219 220 221 222 223 224 225 226 227 228 229 ... 291 292

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