Avision AV6240 - Manual (Page 18)

2-11
Scanner Diagnostics
The scanner has a built-in self-diagnostic function to detect system
errors. The self-test is initiated each time the scanner is turned on.
During the test, the READY LED and ERROR LED will light on. At
the end of the test, if no error occurs, the READY LED should stay
solid while the ERROR LED should extinguish. If the ERROR LED
goes on blinking after the diagnostic test, please consult your local
dealer to resolve the problem.