Apple LaserWriter 12/640 PS - Manual (Page 27)

m Flexible paper handling In the standard configuration, you can print up to 330
sheets (250 in the standard paper cassette plus 80 in the multipurpose tray)
without changing paper. You can easily add a 500-sheet cassette and feeder
or a 50-envelope cassette. The printer also supports duplex printing
(printing on both sides of the paper) when the optional duplex printing
unit is attached.
Choosing a place for the printer
Choose a flat, stable area with adequate room around the printer. The area
should be well ventilated and away from direct sunlight or sources of heat,
cold, or humidity. Keep the printer’s vents free from obstruction to allow for
proper operation and cooling of the printer. Don’t use ammonia-based
cleaners, which can react chemically with the toner, on or around the printer.
See Appendix D, “Technical Information,” for more information about the
physical requirements of the printer.
IMPORTANT Keep the printer’s
vents unobstructed for proper operation
and cooling.
Allow enough space
to open the door.
Make sure you have
enough space to open
the paper cassette.
Allow space to open the top cover.
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