HP Color LaserJet Enterprise M751n Laser Printer - Manual (Page 31)

3. Use the blue adjustment latch to spread the paper
guides to the correct size, and then load paper in
the tray. For information about how to orient the
paper, see Table 2-1 Tray 1 paper orientation
on page 22 .
Make sure that the paper fits under the fill line on
the paper guides.
NOTE: The maximum stack height is 10 mm (0.4
in), or approximately 100 sheets of 75 g/m 2 (20 lb)
paper.
4. Using the blue adjustment latch, adjust the side
guides so that they lightly touch the paper stack,
but do not bend it.
ENWW Load paper to Tray 1 (multipurpose tray) 21