Dahua XVR Cooper Series User Manual page 305

There are following possibilities:
 HDD jumper is damaged.
 HDD is broken.
 Upgraded program is not compatible.
 The recorded file has been overwritten.
 Record function has been disabled.
7. Video is distorted when searching local records.
There are following possibilities:
Video quality setup is too low.

 Program read error, bit data is too small. There is mosaic in the full screen. Please restart
the DVR to solve this problem.
 HDD data jumper error.
 HDD malfunction.
 DVR hardware malfunctions.
8. No audio under monitor state.
There are following possibilities:
It is not a power picker.

It is not a power acoustics.

 Audio cable is damaged.
 DVR hardware malfunctions.
9. There is audio under monitor state but no audio under playback state.
There are following possibilities:
Setup is not correct. Please enable audio function.

Corresponding channel has no video input. Playback is not continuous when the screen is

blue.
10. System time is not correct.
There are following possibilities:
 Setup is not correct.
 Battery contact is not correct or voltage is too low.
 Crystal oscillator is broken.
11. Cannot control PTZ on DVR.
There are following possibilities:
 Front panel PTZ error.
 PTZ decoder setup, connection or installation is not correct.
 Cable connection is not correct.
 PTZ setup is not correct.
 PTZ decoder and DVR protocol is not compatible.
 PTZ decoder and DVR address is not compatible.
 When there are several decoders, please add 120 Ohm between the PTZ decoder A/B
cables furthest end to delete the reverberation or impedance matching. Otherwise the PTZ
control is not stable.
The distance is too far.

12. Motion detection function does not work.
There are following possibilities:
Period setup is not correct.

 Motion detection zone setup is not correct.
FAQ 292