Epson WorkForce WP-4540 User Manual page 199

Caution: Leave your old cartridges in the printer until you are ready to replace them to prevent the print
head nozzles from drying out. Do not open ink cartridge packages until you are ready to install the ink.
Cartridges are vacuum packed to maintain reliability.
1. Turn on your product.
2. If an ink cartridge is low or expended, a message appears on your product and on your computer
screen. Note which cartridges need to be replaced.
3. Open the front cover.
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