Apple LaserWriter 12/640 PS - Manual (Page 210)

Choosing paper
The LaserWriter 12/640 PS prints on standard laser-quality paper (16- to 28-
pound stock). For the best results, Apple recommends 20-pound stock. The
printer can accept stock of up to 32 pounds from the multipurpose tray. You
can also expect excellent results on most colored and textured papers.
The LaserWriter 12/640 PS produces high-quality transparencies for
overhead projection. Medium-weight photocopier transparencies work best. If
you experience difficulties when attempting to print transparencies with
automatic feed, use manual feed instead.
To avoid paper problems, keep the following potential trouble sources
in mind:
m
Temperature Some letterheads are printed with low-temperature dyes that
vaporize and smear at the temperatures inside the printer. Some glossy,
coated letterheads may lose their coating in the printer. Similarly, some
envelopes may seal or come unglued during printing. Using high-quality
stationery and envelopes should ensure satisfactory results.
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Paper texture The LaserWriter 12/640 PS may not print well on rough or
highly textured paper. Try a few sheets to test the quality.
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Paper finish The LaserWriter 12/640 PS may not print well on some papers
with a glossy finish. Again, test a few sheets of any unusual paper stock
you wish to use.
WARNING Do not use heat-transfer (thermal) transparencies in the
LaserWriter 12/640 PS. They will not print properly and may separate
in the printer.
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