Apple ColorLaserWriter 12/600PS - Manual (Page 351)

Photoconductor cartridge is wearing out
When the photoconductor cartridge is near the end of its life, the Alert and
photoconductor lights glow. When the photoconductor is completely worn
out, the printer stops working until you replace the photoconductor cartridge.
For information about ordering replacement supplies, see Appendix A.
Instructions for replacing the photoconductor cartridge come in the package
with the new photoconductor and two toner disposal boxes. (You use two
toner disposal boxes during the lifetime of one photoconductor cartridge.)
If the light comes on in the middle of a printing job, and the output is still
satisfactory, continue printing if you wish. You won’t harm the printer by
doing so.
Note: Don’t throw away the used photoconductor cartridge. For information
on how to return the used photoconductor to the manufacturer, see the
instructions that come with the new photoconductor. By returning the used
photoconductor cartridge, you help reduce waste and preserve the
environment.
M
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C
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When the photoconductor is wearing out,
the Alert and photoconductor lights glow. Photoconductor
cartridge
331 Diagnosing Problems for Service