From the control panel, navigate to:
Settings > Print > Layout > Collate
Touch On [1,2,1,2,1,2].
Print the document.
Is the document collated correctly?
The problem is solved.
Go to step 2.
From the document that you are trying to print, open the Print dialog, and then select Collate.
Go to step 3.
Reduce the number of pages to print.
Are the pages collated correctly?
Contact customer support.
Are you unable to print continuously? Check the paper guide and tray configuration settings.
Check for obstructions that keep the scanner cover open.