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8、 Q: No sound in monitoring
A: Possible cause:
1 Not equipped with active pickups
2 Speakers not switched on
3 Audio cable damaged
4 DVR hardware failure
9、 Q: Audio in monitoring but none in playback
A: Possible cause:
1 Setup error: audio option is not turned on
2 Corresponding channel is not connected to video. Video plays back intermittently with blue
screen
10、 Q: Time display is not correct
A: Possible cause:
1 Setup wrong.
2 Bad battery connection or power low
3 Crystal resonator not working properly
11、 Q: DVR cannot control PTZ
A: Possible cause:
1 Front-end PTZ malfunction
2 PTZ decoder settings, wiring, or installation is incorrect
3 Incorrect cable wiring
4 PTZ settings in DVR are incorrect
5 PTZ decoder and DVR protocol do not match
6 PTZ decoder and DVR address do not match
7 When connected with multiple decoders, PTZ decoder needs to add a 120 ohm resistance
to eliminate the reflection and impedance matching between the far ends of A/B cables, or
PTZ control will be unstable
8 Distance too far
12、 Q: Motion detection does not function
A: Possible cause:
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