Apple ColorLaserWriter 12/600PS - Manual (Page 244)

Photoconductor cartridge is wearing out
When the photoconductor cartridge is near the end of its life, the Alert
and photoconductor cartridge lights glow. When the photoconductor is
completely worn out, the printer stops working until you replace the
photoconductor cartridge. For information about ordering the 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. The printer stops automatically if there is chance it could be
damaged.
Note: Don’t throw away the used photoconductor cartridge. See the
instructions that come with the new photoconductor for information on how
to return the used photoconductor to the manufacturer. By returning the used
photoconductor cartridge, you help reduce waste and preserve the
environment.
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When the photoconductor is wearing out,
the Alert and photoconductor lights glow. Photoconductor
cartridge
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