1.It is not an active tone arm.
2.It is not an active sound box.
3.The audio lines are damaged.
4.The hardware of the NPC is damaged.
The time is wrong.
Possible reasons are as follows:
1.Setting is wrong.
2.The battery is in bad connection or the voltage is too low.
3.The oscillation is damaged.
The motion detect is not wrong.
Possible reasons are as follows:
1.The motion detect area setting is not correct.
2.The sensitivity is too low.
3.Limited by some hardware edition.
The image is not clear or there is no image in network preview or video file playback
state.
Possible reasons are as follows:
1.Network is not stable.
2.The user machine is resource limited.
3.The user has no surveillance purview.
Network connection is not stable.
Possible reasons are as follows:
1.Network is not stable.
2.IP address is conflicted.
3.MAC address is conflicted.
4.The network cad of the computer or the computer is bad.
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