VDH-DXG Series Hardware Manual
8
RS-485 connection
1.
Connect RS-485 cable of the speed dome to the RS-485 interface of DVR,
pay attention to the positive and negative signals.
2.
Connect the video output cable of the speed dome to the DVR video
input
F.
Q & A and Maintenance
1.
Q & A
Q 1.
After power on, DVR doesn’t work.
A: The possible causes:
1. Wrong power input
2. bad connection of power cable
3. Power error
4. Firmware update error
5. Disk error or cable problem
6. Front panel error
7. Main PCB board error
Q 2.
After power-on, DVR will restart after several minutes or the screen
freezes.
A: The possible causes:
1. Unstable or low input voltage
2. The hard drive has bad sectors or cable error
3. Low adaptor power
4. Front video signal not stable
5. High temperature, too much dust and the machine runs in a bad
condition.
6. DVR hardware error
Q 3.
HDD not found after power-on
A : The possible causes:
1. No power for the Hard Drive
2. Hard Drive cable error
3. Hard Disk error
4. Main board SATA slot error
Q 4.
No output: Single, multiple or all channels
A : The possible causes:
1. Wrong firmware: Update to the right firmware
2. Brightness set to 0: set it to the default value
3. No signal input or signal too weak
4. Mask used
5. DVR hardware error
