Apple ColorLaserWriter 12/600PS - Manual (Page 347)

Paper jams
If paper is jammed inside the printer, the Paper Jam light glows steadily.
Lights on the small printer diagram show which doors provide access to the
paper jam.
For instructions on clearing paper jams, see Chapter 11 (or the quick
reference booklet that hangs inside the printer’s door).
For information about recommended papers, see Appendix A.
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The lights on this diagram identify
the access doors nearest the paper jam. Paper Jam light
327 Diagnosing Problems for Service