HP 6510 - Manual (Page 19)

Load envelopes
a.
Pull out paper tray.
❑
If open, close photo tray.
❑ Slide paper-width guide outwards.
❑ Remove all paper from the main input tray.
b. Load envelopes.
❑
Insert one or more envelopes into far-right side of main input tray, with
envelope flaps on left and facing up.
Load media 17