16. There is something wrong with the USB backup or writing a CD.
Possible reasons:
A. The rewritable machine and the hard disk are shared the same data lines.
B. There is too much data to backup. Please stop recording and backup on
another device.
C. The backup equipment is not compatible.
D. The backup equipment is damaged.
17. The keyboard cannot control the DVR.
Possible reasons:
A. The serial port of the DVR is not set correctly.
B. The address is not correct.
C. When multiple transformers are connected, the power supply is not large
enough. Please give each transformer individual power supply.
D. The distance is too far.
18. Alarm cannot be recessional.
Possible reasons:
A. The settings for the alarm are not correct.
B. The alarm output is turned on manually.
C. The input machine is damaged or the connections are not correct.
D. There are some problems for specific program edition, Please update the
program.
19. Alarm is not working.
Possible reasons:
A. The settings for the alarm are not correct.
B. The connection of the alarm is not correct.
C. The alarm input signal is not correct.
D. Alarm is connected with two synchronous loops.
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