From the control panel, navigate to:
Settings > Device > Maintenance > Configuration Menu > Scanner Configuration > Scanner Manual Registration
For non-touch-screen printer models, press 
to navigate through the settings.
From the Print Quick Test menu, select Start.
Place the Print Quick Test page on the scanner glass, and then select Flatbed Registration.
From the Copy Quick Test menu, select Start.
Compare the Copy Quick Test page with the original document.
Note: If the margins of the test page are different from the original document, then adjust Left Margin and Top Margin.
Repeat step 4 and step 5 until the margins of the Copy Quick Test page closely match the original document.