Usage Maintenance - Cobra 57648 Owner's Manual & Safety Instructions

11. Q: Why NVR cannot control PTZ?
A: Please check if:
a) PTZ in the front side is malfunctioned.
b) Setting, connection and installation of PTZ decoder are not correct.
c) NVR's PTZ setting is not correct.
d) Protocol of PTZ decoder does not match that of NVR.
e) Address of PTZ decoder does not match that of NVR.
If many decoders are connected, the farthest side of AB line of PTZ decoder
f)
should be added 120Ω resistance to realize reflection suppression and
impedance matching. Otherwise, PTZ control will be unstable.
12. Q: Why doesn't dynamic detection work?
A: Please check if the motion detection time and motion detection regional setting are
correct and if the sensitivity is set too low.
13. Q: Why doesn't alarm work?
A: Please check if the alarm setting, alarm connection and alarm input signals are
correct.
14. Q: Why does buzzer keep alarming?
A: Please check the alarm setting, check if motion detection function is enabled and
object motion is detected all the time and if I/O alarm is set as Always Off. Besides, refer
to corresponding HDD alarm setting.
15. Q: Why can't I stop recording by pressing "STOP" button or click "Stop Recording" in
context menu?
A: Pressing Stop or Stop Recording can only stop manual record. If you want to stop
Scheduled recording in certain time quantum, please change the setting to No Record.
To stop Startup recording, please change record mode to scheduled recording or
manual recording. Then you may stop recording by the prescribed methods. And
another way of stopping recording is to set channel as off status in record setting.

10.2 Usage Maintenance

1. To shut down NVR, please firstly shut down the system and then turn off the power. Do
not turn off the power directly or HDD data will be lost or damaged.
2. Please keep NVR away from heat sources or places.
3. Clean the internal dust regularly. Make sure the good ventilation of NVR so as to ensure
the good heat dissipation.
4. Please check the HDD cable and data cable regularly to see if they are ageing.
5. Please prevent the audio and video signals of NVR from being intervened by other
electronic devices, and prevent the HDD from being damaged by static electricity and
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USER MANUAL