1.The input voltage is not stable or too low
2.The power of switch power supply is low.
3.Frontal video signal is not stable
4.Bad heat radiator or too much dust or bad running circumstance of the NPC.
5.The hardware of the NPC is damaged.
System can not detect USB or Micro SD card
Possible reasons are as follows:
1.The USB or Micro SD card line is not in good connection
2.The card slot is damaged
3.The storage equipment is damaged
4.The USB port of main board is damaged
I can not find the video files in local playback mode.
Possible reasons are as follows:
1.The storage equipment is damaged.
2.The query condition is wrong.
3.The video files to look up are covered.
4.The recording is not on
.
The local video is not clear.
Possible reasons are as follows:
1.The image quality is too bad.
Normally the problem will be solved after reboot up the NPC.
3.The storage equipment is damaged.
4.The hard disk is damaged.
There is no audio signal in the surveillance window.
Possible reasons are as follows:
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