FAQ
209
7
FAQ
If your questions cannot be answer by the following contents, please contact your local service
engineer or the service of our Headquarters for help. We can guide you to solve this problem.
1) Q: Disconnect the constant electricity but the device is still working.
A: Possible causes:
The default 5-minute shutdown delay is effective.
The UPS setting provides constant power supply to the device when the lithium
battery voltage is above 7V.
ACC is connected.
2) Q: The device gives squeal after start.
A: Possible causes:
Connecting to the display and being too close to the camera.
A single channel interface or a large-image multi-channel interface. The first route of
sound comes from a local source.
3) Q: The interface shows that no SIM card is detected.
A: Possible causes:
SIM card not inserted.
Micro SIM card reversely inserted with its notch facing outward. Follow instructions on
the label to insert the SIM card.
SIM card is damaged.
4) Q: DVR cannot boot up properly.
A: Possible causes:
The input power is not correct; the input voltage is too low or too high.
Poor contact in the input power cable or incorrect wiring.
Main board is damaged.
5) Q: DVR automatically reboots or frequently crashes.
A: There are the following possibilities
Input voltage is not stable or too low.
The Device is not properly installed, which result in poor contact between
components.
Poor heat dissipation and too many dusts result in poor working environment for the
Device.
Hardware malfunction.
6) Q: Blank screen in a channel of the display
