HP Deskjet 6540 Color Inkjet Printer - Manual (Page 147)

Printout has an unwanted border
For most photo paper types
If the printout has an unwanted border, then align the print cartridges .
If printing a two-sided document, print the document manually rather than
automatically.
For photo paper with a tear-off tab
If the border appears below the tear-off tab, then remove the tab.
If the border appears above the tear-off tab, then align the print cartridges .
HP Deskjet 6500 series printers User's Guide
147