Apple ColorLaserWriter 12/600PS - Manual (Page 346)

Out of paper
If the printer cannot find paper, the Paper Out light glows steadily. Lights on
the small printer diagram show which paper cassette needs to be refilled.
When the Paper Out light blinks, the printer is ready for you to feed paper
manually.
For instructions on loading paper, see Chapter 9 (or the quick reference
booklet that hangs inside the printer’s door).
For information about recommended papers, see Appendix A.
!
Paper Out light
M C
Y Bk
326 Appendix G