Amcrest General 720P(V2) Mini 1U Series User Manual page 173

6. Can not search local recordings.
Here are a few possibilities:

HDD cable is damaged.

HDD is broken.

Upgraded program is not compatible.

The recorded file has been overwritten.

Recording function has been disabled.
7. Video is distorted when searching local records.
Here are a few possibilities:

Video quality seting is too low.

Program read error; the bit data is too small. There is picture in the full screen. Please restart
the DVR to solve this problem.

HDD data cable error.

HDD malfunction.

DVR hardware malfunctions.
8. There is no audio when monitoring.
Here are a few possibilities:

It is not a powered microphone.

It is not a powered speaker.

Audio cable is damaged.

DVR hardware malfunctions.
9. There is audio when monitor but there is no audio when the system plays back.
Here are a few possibilities:

Setup is not correct. Please enable the audio function

Corresponding channel has no video input. Playback is not continuous when the screen is blue.
10. Time display is not correct.
Here are a few possibilities:

Setup is not correct.

Battery contact is not correct or voltage is too low.

Crystal is broken.
11. DVR can not control PTZ.
Here are a few 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 are not compatible.

PTZ decoder and DVR address are not compatible.
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