ELRO FA420DVR 4-ch digital recorder + 500 gb hard disc USERS MANUAL User Manual
Page 67
Page 67
8
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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
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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
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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
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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
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Q: Motion detection does not function
A: Possible cause: