Lexmark MC2640
Turn off the printer, and then unplug the power cord from the electrical outlet.
Using a damp, soft, lint‑free cloth, wipe the touch screen.
Notes:
Connect the power cord to the electrical outlet, and then turn on the printer.
Unusual or erratic touch screen display issues after upgrading the firmware to certain version 23.0 RIP firmware releases (xxxxx.230.204 through xxxxx.230.210).
Do scanned images and text have specks in them? Learn how to clean the glass on your scanner effectively.