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Alhua - Dahua DVR Manual

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FAQ 291
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.
… 304 …


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  • We have lost power on our DVR, there is power up to the power supply,
    and the whole system is coupled to a UPS system for some time......
    we have had zero lightning and any effects of load shedding is nullified by UPS system,
    could you kindly inform what could be wrong PLEASE ?
    Chris Gibson 0827932600 Submitted on 22-2-2023 at 12:16

    Reply Report abuse


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