Dell P1500 Personal Mono Laser Printer - Manual (Page 29)

Flex the sheets back and forth to loosen them, fan the sheets on all four sides, and flex them again. 4.
If loading letterhead paper, insert letterhead face down with the top of the page entering the printer
first. 5.
Do not exceed the stack height indicator; overfilling the tray may cause paper jams. 6.