Apple LaserWriter 12/640 PS - Manual (Page 291)

For best results when printing envelopes, be sure to position your address
block properly in your word-processing document. You’ll need to print in
landscape (horizontal) orientation and to adjust the top and left margins in
your word-processing program’s page formatting controls.
Once you’ve set the top and left margins, type the return address, skip a few
lines (the exact number depends on the font you’re using and the way you
like your envelopes to look, so you’ll have to experiment), and type the
address block.
Note: If the multipurpose tray and the optional envelope cassette have the
same size envelopes when automatic tray switching is on, the printer will use
the multipurpose tray first (if the multipurpose tray is set to the envelope
size). To use the envelope cassette, do one of the following:
m Pick the envelope cassette as the paper source in the Print dialog box.
m Set the multipurpose tray to a size other than the one used by the envelope
cassette. (You can do this with the Apple Printer Utility or the Apple
LaserWriter Utility for Windows.)
m Change the optional envelope cassette to “Installed and Preferred” in the
Setup dialog box. (You can view the setup dialog box by selecting the
desktop printer icon and choosing Change Setup from the Printing menu.)
WARNING Don’t use envelopes that have fasteners, snaps, or windows
when printing with the LaserWriter 12/640 PS printer. Also don’t use
envelopes that seal with peel-off strips or pressure-sensitive adhesives,
that are curled or wrinkled, or that are likely to discolor or melt at
temperatures of about 400° F (204° C). Printing on such materials can
damage the printer.
266 Chapter 10