Dahua XVR User Manual page 285

 Please use the brush to clean the board, socket connector and the chassis regularly.
 The device shall be soundly earthed in case there is audio/video disturbance. Keep
the device away from the static voltage or induced voltage.
 Please unplug the power cable before you remove the audio/video signal cable,
RS232 or RS485 cable.
Do not connect the TV to the local video output port (VOUT).It may result in video

output circuit.
 Always shut down the device properly. Please use the shutdown function in the menu,
or you can press the power button in the front panel for at least three seconds to shut
down the device. Otherwise it may result in HDD malfunction.
 Please make sure the device is away from the direct sunlight or other heating sources.
Please keep the sound ventilation.
 Please check and maintain the device regularly.
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