18Turn on/off the power of the extension unit■ Turn on the power of the exten-sion unitTurn on the power of the extension unit before turning on thepower of the recorder.1 Insert the power plug into an outlet.120 V AC 60 Hz, for the NTSC model220 V to 240 V AC 50 Hz, for the PAL modelUse the power source that is suited to your model.2 Press the POWER switch on the rear of the extensionunit to turn on the power.• The OPERATE indicator will light and the system check(checking the system and hard disk drives) will start.• The "WJ-HDE400" indication will be displayed on theLCD at startup.• When the system check is complete, operationalmode display will be displayed on the LCD. (Page 19)■ Turn off the power of the exten-sion unitTurn off the power of the extension unit after turning off thepower of the recorder. Refer also to the manuals provided withthe recorder.1 Stop recording on the recorder.• Stop all recordings on the network disk recorder.• Stop all playbacks.2 Turn off the power of the recorder by pressing thePOWER switch at the rear of the network diskrecorder.Turn off the power of the network disk recorder after con-firming that all the HDD access indicators are off. TheOPERATE indicator on the network disk recorder will gooff.3 Turn off the power of the extension unit by pressingthe POWER switch at the rear.Turn off the power of the extension unit after confirmingthat all the HDD access indicators are off. The OPERATEindicator on the extension unit will go off.Important:• Do not turn off the power in the process of recovery. It mayresult in recovery failure.• Remove the plug from the outlet if not operating the exten-sion unit for a length of time.• When the extension unit has not been used for a certainperiod, turn on the power (approximately once a week)and perform recording/playback to prevent interferenceswith functions.