User manual

Page
57
Possible reasons are as followed:
1 The program is not matched. Please update the program.
2 The image brightness is all 0. Please restore the default setup.
3 There is no video input signal or the signal is too weak.
4 The channel protection or the screen protection is set.
5 The hardware of the NVR is damaged.
5、 I can not find the video files in local playback mode.
Possible reasons are as followed:
1 The data line of the hard disk is damaged.
2 The hard disk is damaged.
3 Update the different program with the origin program files.
4 The video files to look up are covered.
5 The recording is not on.
6、 The local video is not clear.
Possible reasons are as followed:
1 The image quality is too bad.
2 The reading program is wrong. Reboot up the NVR.
3 The data line of the hard disk is damaged.
4 The hard disk is damaged.
5 The hardware of the NVR is damaged.
7、 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 NVR is damaged.
8、 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.