Apple LaserWriter 12/640 PS - Manual (Page 224)

This chapter provides solutions to problems you may encounter with paper
jams or print quality while using your LaserWriter 12/640 PS. The first
section discusses how to read the printer’s indicator lights to help you identify
and solve problems, and how to clear paper jams. The rest of the chapter
covers specific problems that can occur when you are printing a document.
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Fixing Paper and Image Problems