Lexmark MX632
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.
Know the different gestures that you can do using the on‑screen keyboard of your printer when the printer is in Accessibility mode.
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).