Appendix A Troubleshooting, Daily
Maintenance and Glossary
10. Cannot login to client end or Web
Possible reasons:
• The ActiveX control has been disabled
• Display card driver needs to be upgraded to dx8.1 or higher
• Network connection error
• Network setup error
• Password or User Name is invalid
• Client end is not compatible with the NVR program
11. Network connection is not stable
Possible reasons:
• Network is not stable
• IP address conflict
• MAC address conflict
• PC or NVR network card is damaged
12. Burner error /USB back error
Possible reasons:
• Burner and NVR are on the same data cable
• System uses too many CPU resources. Stop recording first, and then begin the backup.
• Data amount exceeds the backup device capacity. It may result in burner error.
• Backup device is not compatible
• Backup device is damaged
13. Keyboard cannot control NVR
Possible reasons:
• NVR serial port setup is not correct
• Address is not correct
• When there are several switchers, power supply is not sufficient
• Transmission distance is too far
14. Alarm signal cannot be disarmed
Possible reasons:
• Alarm setup is not correct
• Alarm output has been opened manually
• Input device error or connection is not correct
• Some program versions may have this problem. Please upgrade your system.
15. Alarm function does not work
Possible reasons:
• Alarm setup is not correct
• Alarm cable connection is not correct
• Alarm input signal is not correct
• There are two loops connected to one alarm device
NVR4200 Series User Guide
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