Lexmark MX812
Load an original document faceup, short edge first into the ADF tray or facedown on the scanner glass.
Notes:
If you are loading a document into the ADF tray, then adjust the paper guides.
From the home screen, navigate to:
Fax > enter the fax number > Options
Adjust the fax darkness, and then touch Fax It.
Here are troubleshooting steps when unable to 'Send' a fax with Laser Multifunction Printers (MFPs).
Unable to 'Receive' a Fax with Laser Multifunction Printers (MFPs)