TechVision DVR-LT04120 User Manual page 135

16. Burn error /USB back error.
There are following possibilities:
 Burner and DVR are in the same data cable.
 System uses too much CPU resources. Please stop record first and then
begin backup.
 Data amount exceeds backup device capacity. It may result in burner error.
 Backup device is not compatible.
 Backup device is damaged.
17. Keyboard can not control DVR.
There are following possibilities:
 DVR serial port setup is not correct
 Address is not correct
 When there are several switchers, power supply is not enough.
 Transmission distance is too far.
18. Alarm signal can not been disarmed.
There are following possibilities:
 Alarm setup is not correct.
 Alarm output has been open manually.
 Input device error or connection is not correct.
 Some program versions may have this problem. Please upgrade your
system.
19. Alarm function is null.
There are following possibilities:
 Alarm setup is not correct.
 Alarm cable connection is not correct.
 Alarm input signal is not correct.
 There are two loops connect to one alarm device.
20. Remote control does not work.
There are following possibilities:
 Remote control address is not correct.
 Distance is too far or control angle is too small.
 Remote control battery power is low.
 Remote control is damaged or DVR front panel is damaged.
21. Record storage period is not enough.
There are following possibilities:
 Camera quality is too low. Lens is dirty. Camera is installed against the light.
Camera aperture setup is not correct.
 HDD capacity is not enough.
 HDD is damaged.
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