Specifications

Section-5 Maintenance
November 11, 2013
5‐40
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300
ThePCMcardcontainsabatterythatisusedfortherealtimeclockintheTCU.Thebatterypowersrealtimeclock
circuitrytomaintaintheclocktime/datewhentheunitdoesnothaveACpowerapplied.Theunitistypically
shippedwiththebatteryremovedfromthePCMcard.
Thebatteryshouldbeinstalledbeforethetransmittergoes
intooperation.
Theclockbattery(partnumber660‐0093‐000forolderPCM‐1cardsand660‐0054‐000formorerecentPCM‐2
models)ispackedinsideaplasticbagthatcontainsbatteryreplacementinstructions.Oncethetransmitteris
installedandACpowerhasbeenconnectedtheclockbatteryshouldbeinstalled
inthePCMcard.
5.14.5.1 PCM‐2BatteryInstallationInstructions
STEP 1 Turnoffthetransmitterandremovepowerfromthetransmittercabinetor
disconnecttheACplug(s)fromtherearoftheTCU.
Caution
TCU CARDS ARE NOT HOT SWAPPABLE. THE TRANSMITTER SHOULD BE
OFF AND THE POWER DISCONNECTED FROM THE TCU BEFORE REMOVAL
OF CARDS.
STEP 2 UsethefingerholecutoutsbuiltintothesidesoftheTCUfrontpanelashandles,pull
outwardanddownonthefrontcover.
STEP 3 LocatethebatteryholderonthePCM‐2card.Locationisshowninfigure5‐34.
Figure 5-34 PCM-2 Battery and Holder
STEP 4 Useasmallflatbladescrewdrivertogentlypryopenthebatteryholddownclip
whil eslidingthebatteryundertheclip.The+sideofthebatterymustinstalled
closesttothebatter yclip,i.e.the+sidemustpointawayfromtheboard.The
installedbattery
isshowninfigure5‐34.
STEP 5 Closefrontpanel.
STEP 6 ReapplyACpower.
STEP 7 Resettimeanddateasneeded.Seesection5.14.4onpage5‐39.
STEP 8 Endofprocedure.
5.14.5.2 PCM‐1BatteryInstallationInstructions
STEP 1 Turnoffthetransmitterandremovepowerfromthetransmittercabinetor
disconnecttheACplug(s)fromtherearoftheTCU.