Apple ColorLaserWriter 12/600PS - Manual (Page 349)

Low fuser oil
When the bottle containing fuser oil is nearly empty, the Alert light glows.
When the fuser oil compartment is empty, the printer stops working until you
replace the oil. For information about ordering replacement supplies, see
Appendix A.
Instructions for replacing the fuser oil come in the package with the new
bottle of fuser oil.
M
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C
Y Bk
When fuser oil is low, the Alert
and fuser oil lights glow. Fuser oil
329 Diagnosing Problems for Service