Gasboy CFN Series Diagnostic Manual - Manual (Page 161)

Island Card Reader
03/19/04 4-45
Possible Cause Checks Corrective Action
Display stuck on a message
and system buzzing. Check for shorted keypad
position or moisture. Dry off keypad or replace
keypad. If moisture, repair
seal in door.
Reader goes down and up,
especially at night. None. Replace power supply module
if it is the older power general.