Checking The Ink Supply - Epson Stylus CX3100 Copy Manual

In addition to being used in document copying, ink is also consumed
in the following operations: print head cleaning, self-cleaning cycle
performed when this product is turned on, and ink charging when
the ink cartridge is installed in this product.
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Caution:

Checking the Ink Supply

You can check the amount of ink remaining in the ink cartridges,
using the Control Panel.
Press one of the Menu buttons repeatedly until Ink Levels
appears on the LCD panel. The amount of ink left appears as a
percentage between 0% and 100%, in 10% increments.
You can use the following cartridges with this product.
Black ink cartridge
Color ink cartridge
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Replacing Ink Cartridges
EPSON recommends the use of genuine EPSON ink
cartridges. Other products not manufactured by EPSON
may cause damage to this product not covered by EPSON's
warranties.
Leave the old cartridge installed in this product until you
have obtained a replacement; otherwise, ink remaining in the
print head nozzles may dry out.
Do not refill the ink cartridges. This product calculates the
amount of ink remaining using an IC chip built into the ink
cartridge. Even if the cartridge is refilled, the amount of ink
remaining is not be recalculated by the IC chip and therefore
the amount of ink available for use does not change.
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