Envy 4520 requires a set of HP Tri-color dye based cartridge and HP Black pigment based cartridge for Instant Ink eligible printing. Your envy printer provides a high yield on genuine HP cartridges. When your All-in-One is not in use consider switching it OFF to reduce ink waste and coagulation. Consistently try to avoid dropped and jarring Ink Cartridges from Installation. Ensure to keep all HP Cartridges shielded in its original packing.
Reinstall Envy Ink Cartridges Switch power OFF from the 123 hp envy 4520 setup and wait till the print carriage exhibits idleness. Draw Cartridge access door upward to open it. Now detect the cartridge tab and then unlatch it. Press down the empty Ink Cartridge to remove it. Free the packing from new cartridges and detach the plastic flaps from it. Place the Ink Cartridge inside the cartridge tab and lock it using latches. Ensure that you install HP Ink Cartridges according to the default color coded letters. Redo the above procedure to install any further Ink Cartridges. Shove Cartridge access door downward to close it. Switch power ON in your Envy 4520.
Envy 4520 Single Cartridge operation Mode Your printer is operable on a single cartridge operation mode with instructions commanded from computer. By default your Envy automatically enters the single cartridge mode whenever a depleted or empty cartridge is uninstalled. You can exit this mode by installing Ink Cartridge inside the empty cartridge tab and latch it.