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A.
It does not have an active tone arm.
B.
It does not have an active sound box.
C.
The audio lines are damaged.
D.
The hardware of the DVR is damaged.
9.
There is audio signal in the surveillance window but no audio signal
in the playback state.
Possible reasons:
A.
Setting issues: the audio option is not chosen.
B.
The according channel is not connected with the video.
10.
The time is wrong.
Possible reasons:
A.
Setting is wrong..
B.
The battery has a bad connection or the voltage is too low.
C.
The oscillation is damaged.
11.
The DVR cannot control the PTZ.
Possible reasons:
A.
There is something wrong with the frontal PTZ.
B.
The setting, connection or the installation of the PTZ decoder is not
correct.
C.
The connections are not correct.
D.
The PTZ setting of the DVR is not correct.
E.
The protocols of the PTZ decoder and the DVR are not matched.
F.
The address of the PTZ decoder and the DVR are not matched.
G.
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.
H.
The distance is too far.
