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Possible reasons are as followed:
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 DVR is damaged.
9
、
There is audio signal in the surveillance window but mo audio signal in the playback
state.
Possible reasons are as followed:
1
Setting issues: the audio option is not chosen.
2
The according channel is not connected with the video.
10
、
The time is wrong.
Possible reasons are as followed:
1
Setting is wrong..
2
The battery is in bad connection or the voltage is too low.
3
The oscillation is damaged.
11
、
The DVR can not control the PTZ.
Possible reasons are as followed:
1
There is something wrong with the frontal PTZ.
2
The setting, connection or the installation of the PTZ decoder is not correct.
3
The connections are not correct.
4
The PTZ setting of the DVR is not correct.
5
The protocols of the PTZ decoder and the DVR are not matched.
6
The address of the PTZ decoder and the DVR are not matched.
7
When multiple decoders are connected, the far port of the PTZ decoder line A(B) must
connect a 120
resistance to reduce the reflection otherwise the PTZ control is not
stable.
8
The distance is too far.
12
、
The motion detect is not working,
Possible reasons are as followed:
1
The time range set is not correct.
