ZMODO ZMD-DT-SCN4 - Manual (Page 70)

H.264 Super Digital Video Recorder User Manual
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display time.
5 The recording is not on.
7、 The local playback video is not clear.
Possible reasons are as followed:
1 The recoding image quality is too bad.
2 The reading program is wrong. Reboot up the DVR.
3 The data line of the hard disk is damaged.
4 The hard disk is damaged.
5 The hardware of the DVR is damaged.
8、 There is no audio signal in the surveillance window.
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
Ω
resistance to reduce the reflection otherwise the PTZ control is not
stable.