Epson WorkForce WP-4540 User Manual page 201

5. Remove the cartridge from the package.
Caution: Do not touch the green chip on the cartridge. Install the new cartridge immediately after
removing the old one; if you do not, the print head may dry out and be unable to print.
6. Gently shake the ink cartridge horizontally for about five seconds as shown.
Caution: Do not remove any labels or seals, or ink will leak.
7. Insert the new cartridge into the holder and push it in until it clicks into place.
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