The scanner might not operate the first time you install and turn it on.
It also might stop operating if the batteries become too low or if the
scanner is dropped or subjected to a physical or electrical shock. If
this happens, follow these steps:
CAUTION: This procedure clears all the information you have programmed
into the scanner. Use this procedure only when you are sure
your scanner is not working properly.
1. Turn off the scanner.
2. While you press and hold down 2 and 9, turn on the scanner.