Apple LaserWriter 12/640 PS - Manual (Page 282)

Letter-size paper
1 Set the length guide (located on the back of the cassette) to the position that
corresponds to your paper’s length. You adjust the length guide by pushing or pulling
the guide.
2 Adjust the width guide to its maximum width by squeezing the colored lever (located on
the right side of the cassette) against the brace and sliding the guide outward.
3 Push down gently on the paper tray until it rests against the bottom of the cassette and
locks into place.
4 Slide the paper beneath the bracket at the front left of the cassette. Push the paper down
if necessary, but don’t overload the cassette, or the paper may jam when you print.
Slide paper under
the retainers. Make sure the paper fits
under this corner bracket.
257 Loading Paper