a) Audio function setup in “OFF” mode in system；
b) Use wrong input cables；
Alarm Relative Issues
1) Q: Alarm input invalid？
A: May be the following reason to cause this problem:
a) Alarm setup in a wrong way in syste；
b) Alarm input cable did not connect to the device or cable not works；
c) Alarm trigger signal to get an electric shock failure；
2) Q: Alarm output invalid？
A: Possible reason is as follows：
a) Cable connection in a wrong way；
b) System setting in a wrong way, such as do not open alarm output, or level output
setting is not correct；
Other Issues
1) Q: When power on, why the power light is not bright?
A: Possible reasons are as follows
a) Voltage range is not within 7V-42V；
b) Fuse in the power line has burning out；
c) Ignition signal has not connected；
2) Q: ERR indicator keep on light？
A: The following errors will cause the ERR indicator keep on light：
a) 1) SD card and HDD didn't be inserted. Or SD card and HDD have inserted without
unusual system partition, So device can‟t be identified.2）Disc has wrong reading and
writing
b) Singlechip works unusually
3) Q: Why REC indicator is off or flicker?
A: There are three states on the SD card indicator: OFF, ON and Flicker:
OFF：can‟t find the disk or it‟s not recording
ON： SD card exists, SD card is working.
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