Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 236)

Section-5 Maintenance

October 17, 2013

5‐56

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.

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