Panasonic KX-PS8100 - Manual (Page 213)

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Care and Maintenance
Life of components
The life of components will vary depending on what you print and the media
you use and environment.
Panasonic shows life based on an average of 5% coverage of the printable
area and standard density for any one color.
In case of Monochrome printing, 1 color (Black only) is used.
In case of full color printing, 4 colors (Cyan, Magenta, Yellow and Black) are
used.
The frequency of replacement will vary, depending on the complexity of the
prints and the percentage of coverage of each color and print density.
For details on the life of components, refer to next “User replaceable
components”.
User replaceable components
When the printer panel indicates that a supply needs to be replaced, make
sure that you have replacement supplies on hand. The printer may continue
to print until the supply is completely used up; but then it stops until you
replace the indicated supply. The frequency of replacement will vary,
depending on the complexity of the prints and the percentage of coverage
of each color and print density.