Specifications

Section-5 Maintenance
November 11, 2013
5‐28
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WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300
5.11 PACabinetFanReplacement
Therearetwo230VAC50/60HzfansintheMaxivacabinet.TheygettheirACpowerfromthecontrolbreakerson
powerdistributionpanel.
Note
Deactivating the control breakers will turn off the cabinet fans but they also will disable the TCU and
exciters.
Thecabinetfansoperatecontinuouslywheneverthetransmitterison.Thefansareredundant,eitherofthefans
canberemovedwhilethetransmittercontinuesoperatingwithoneremainingoperationalfan.Thecabinetcooling
fanssupplyairtothePAmodules,IPA(driver)modulesandthepredrivers.Exhaustairfromthe
fansexitsthe
cabinetatthetop.
5.11.1 CabinetFanRemoval
STEP 1 Opentherearcabinetdoor.
STEP 2 DisconnectconnectorsJ1&J3(seeFigure5‐17)fromthefancontrolboardwhichlies
justabovethefanthatis toberemoved.
Figure 5-17 Fan Control Board Connectors J1 & J3
STEP 3 Usea10mmsocketdrivertoremovethetwonuts(seeFigure5 ‐18)thatholdthefan
assemblyinplace.
Remove