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6.4 Common Problems Resolution
The device cannot start normally or keeps restarting.
Possible causes:
1. DVR is upgraded with wrong program which has caused the damage to the
system software.
2. The main board is defective, please contact the supplier for maintenance.
3. HDD is defective, please change the HDD.
Cannot use the remote control.
Possible causes:
1. Check if the batteries in the remote control are installed correctly,
especially the positive and negative polarity.
2. Check if the batteries in the remote control have power.
3. Check if the remote control window is covered.
4. Please check if the remote address of the DVR matches the address of the
remote control.
PTZ cannot control
Possible causes:
1. Incorrect cable connection of the RS-485 port, A, B ports are connected
oppositely.
2. Incorrect settings of PTZ decoder type, protocol, baud rate and address
bit.
3. The quantity of the PTZ connected to the RS-485 bus is relatively big,
which causes the signal reflection, and you need to parallel connect a
120
Ω electrical resistance in the far-end.
4. The RS-485 port of the main board is defective.
The preview image of the DVR is scratched.
Possible causes:
Video input format is not matched. If the camera is with NTSC format but the
DVR is with PAL format ,the preview image will be scratched.
DVR playback image is scratched or not able to search the
recording.
Possible causes:
