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3
The power of switching power supply is not enough
4
The video signal of front end is unstable
5
Bad ventilation, too much dust, the operating conditions of machine are too severe
6
The contact between main board and other auxiliary board is bad
7
Hardware failure of digital video recorder
3.
Ask: single channel, multiple channels, all videos have no output
Answer: possible reasons:
1
Please check the power supply connecting camera for loose
2
Please check the connecting wire of video output and input on the rear panel of DVR
3
Directly insert the video source into display device to judge if it is the problem of video
source or display device
4
Check image brightness to see if it becomes 0, restore to default setting
5
No video input signal or the signal is too weak
6
Preview closed is set in display setting
7
Hardware failure of digital video recorder
Ask: can't record normally after starting up, a "H" is prompted on the interface
4.
Answer: possible reasons:
1
Check if DC12V power adapter is adopted by the machine
2
Check if new hard disk has been formatted on the local host
3
The contacts of hard disk power cable, data cable are bad or damaged
4
Hard disk is damaged
5
SATA port of main board is damaged
Ask: what's the meanings of "R" "M" "I" "H" prompted on direct connection picture
5.
Answer:
"R" means that record is being carried out on the channel
1
"M" means that motion detection is triggered on the channel
2
"I" means that external I/O alarm is triggered on the channel
3
"H" means that the device has no hard disk connected or hard disk failure or disk full
4
6.
Ask: real time image problem, such as video image color, brightness have serious distortion
Answer: possible reasons:
1
When BNC is used for output, the selection of PAL system and NTSC system is incorrect,
the image will become black and white
2
Digital video recorder and the impedance of monitor not matched
3
Video transmission distance is too long or the fading of video transmission cable is too high
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