VDH-NK350A
Hardware Manual
7
F.
Q & A and Maintenance
1.
Q & A
Q 1.
After power on, NVR 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, NVR 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. NVR 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. NVR hardware error
Q 5.
Live video problems: Such as bad colors, brightness error, image blink…
A : The possible causes:
1. Impedance mismatch between digital video recorder and monitor.
2. Video transmission distance is too far or video transmission line
attenuation is too much.
3. Wrong settings of colors, brightness in the NVR
