Amcrest General 720P(V2) Mini 1U Series User Manual page 174

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When there are several decoders, please add a 120 Ohm resistor between the PTZ decoder
A/B cables at the furthest end to delete the reverberation or impedance matching. Otherwise
the PTZ control is not stable.
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The distance is too far.
12. Motion detection function does not work.
Here are a few possibilities:

Period setup is not correct.

Motion detection zone setup is not correct.

Sensitivity is too low.
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For some versions, there is hardware limit.
13. Can not log in to client-end or web.
Here are a few possibilities:

For Windows 98 or Windows ME user, please update your system to Windows 2000 sp4. Or
you can install client-end software of lower version.

ActiveX control has been disabled.

No directx8.1 or higher. Please upgrade display card driver.

Network connection error.

Network setup error.

Password or user name is invalid.

Client-end is not compatible with the DVR program.
14. There is only a picture. No video when previewing or playing back video file remotely.
Here are a few possibilities:

Network fluency is not suffecient.

Client-end resources are limited.

There is a multiple-cast group setup in the DVR. This mode can result in a picture. Usually we
do not recommend this mode.

There is privacy mask or channel protection setup.

Current user has no right to monitor.

DVR local video output quality is not suffecient.
15. Network connection is not stable.
Here are a few possibilities:

Network is not stable.

IP address conflict.

MAC address conflict.

PC or DVR network card is deffective.
16. Burn error /USB back error.
Here are a few possibilities:

Burner and DVR are on the same data cable.

System uses too much CPU resources. Please stop recording first and then begin backup.

Data amount exceeds backup device capacity. It may result in a burner error.
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