Specifications

Section-5 Maintenance
October 17, 2013
5‐56
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004
STEP 6 InstallthebatterybackupboardandtightenthefourPhi llipsmounting
screws.Thebatterybackupboard,standoffs,andmountingscrewsare
showninFigure5‐42onpa
ge5‐55.
STEP 7 ReplacetheLPUcoverandtightenhardware.
STEP 8 Ifrackmounted,slidetheLPUintotherack.
STEP 9 ReconnectallcablestotherearoftheLPUandtightenconnectorsas
required.
STEP 10 RestoreACmainspowertotheLPU.
STEP 11 IfdualLPUsarebeingusedswitchtheDriveControltoAuto.
Note
Operation of the battery backup board can be monitored on the LPU Battery Backup GUI screen. Refer to
Figure 3-75 on page 3-81 for a detailed description of the Battery Backup status screen.
STEP 12
Endofprocedure.
5.9.14 SignalProcessorBoardRemoval
ToolsRequired:
• #1Phillipsscrewdriver
• #2Phillipsscrewdriver
• 9/16"wrench
• 3/16"nutdriver
• M6nutdriver
Caution
FOLLOW APPROPRIATE ESD PROCEDURES TO INSURE PROPER
GROUNDING BEFORE HANDLING PRINTED CIRCUIT BOARDS.
STEP 1 IfthesystemhasdualLPUsmaketheLPUthatisnotbeingrepairedthe
activeunit.
STEP 2 RemoveACmainspowerfromtheLPUbeingrepaired.
Note
Removal of the ribbon cables that attach to Control A and Control B connectors on the rear of the LPU
will cause the safety interlock to open and take the transmitter off-air. The removed LPU can be bypassed
by connecting the Control A and Control B ribbon cables together with a jumper cable Harris part no.
952-9248-072. Connecting the cables together with this cable will close the interlock chain and allow
continued operation on the active LPU. The same cable can be used to bypass a removed PAB chassis.
STEP 3 IftheLPUisinstalledinarack,removeitandplaceitonabench.
STEP 4 RefertoFigure5‐43andFigure5‐44belowtolocatefittingsasneeded
throughoutthepr
ocedure.
STEP 5 Ascablesaredisconnectedeachconnectorremovedshouldbemarkedwith
thejacknumberthatitconnectsto.Useafinepermanentmarkerortapeto
markeachcable.Thisisimportantsincemanyofthecablesarenotmarked
andtheirroutingiscritical.