Scanner works but keypad will not

The keypad may be locked. Lock and Unlock procedure is below:

To turn off the Keylock, press FUNC then . The scanner beeps 3 times and Key unlocked appears.

To turn on the Keylock, press FUNC then . Key locked appears for about 1 second. Key locked appears when you press any key.

Here's a link to your scanner manual:

http://marksscanners.com/97/97.shtml