TechVision DVR-LT04120 User Manual page 133

6. Can not search local records.
There are following possibilities:
 HDD ribbon is damaged.
 HDD is broken.
 Upgraded program is not compatible.
 The recorded file has been overwritten.
 Record function has been disabled.
7. Video is distorted when searching local records.
There are following possibilities:
 Video quality setup is too low.
 Program read error, bit data is too small. There is mosaic in the full screen.
Please restart the DVR to solve this problem.
 HDD data ribbon error.
 HDD malfunction.
 DVR hardware malfunctions.
8. There is no audio when monitor.
There are following possibilities:
 It is not a power picker.
 It is not a power acoustics.
 Audio cable is damaged.
 DVR hardware malfunctions.
9. There is audio when monitor but there is no audio when system playback.
There are following possibilities:
 Setup is not correct. Please enable audio function
 Corresponding channel has no video input. Playback is not continuous when
the screen is blue.
10. Time display is not correct.
There are following possibilities:
 Setup is not correct
 Battery contact is not correct or voltage is too low.
 Crystal is not broken.
11. DVR can not control PTZ.
There are following possibilities:
 Front panel PTZ error
 PTZ decoder setup, connection or installation is not correct.
 Cable connection is not correct.
 PTZ setup is not correct.
 PTZ decoder and DVR protocol is not compatible.
 PTZ decoder and DVR address is not compatible.
133