Appendix A Troubleshooting, Daily
Maintenance and Glossary
5. Cannot search local recordings
Possible reasons:
• HDD ribbon is damaged
• HDD is damaged
• Upgraded program is not compatible
• The recorded file has been overwritten
• The Record function has been disabled
6. Video is distorted when searching local recordings
Possible reasons:
• Video quality setup is too low
• Program read error, bit data is too small. If there is a mosaic pattern in the full screen—
Restart the NVR to solve this problem
• HDD data ribbon error
• HDD malfunction
• NVR hardware malfunction
7. Time display is not correct
Possible reasons:
• Setup is not correct
• Battery contact is not correct or voltage is too low
• Crystal is damaged
8. NVR cannot control Pan/Tilt/Zoom (PTZ)
Possible reasons:
• Front panel PTZ error
• PTZ decoder setup, connection or installation is not correct.
• Cable connection is not correct.
• Distance from NVR to PTZ is too long
• PTZ setup is not correct.
• PTZ decoder and NVR protocol is not compatible.
• PTZ decoder and NVR address is not compatible
9. There is a mosaic pattern on the screen—no video when viewing live video or playback file
Possible reasons:
• Poor network quality
• Client end resources are limited
• There is a multicast group setup on the NVR. This mode can result in a mosaic screen.
Usually this mode is not recommended.
• There is a Privacy Mask or channel protection setup
• Current user does not have proper rights to monitor
• NVR local video output quality is of poor quality
NVR4200 Series User Guide
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