9.Close the printer cover and press the H ink cartridge replacement button. The printer moves the print head and begins charging the ink delivery system.
The P power light flashes and the printer makes noise. Charging takes about one minute. When it’s finished, the P power light stops flashing and stays on.
Never turn off the printer while the Ppower light is flashing, unless the printer hasn’t moved or made noise for more than 5 minutes.
Replacing a Cartridge When Print Quality Declines
Even if the H ink out light isn’t flashing or on, you may need to replace an ink cartridge if it’s been installed in your printer for more than six months and print quality declines. If print quality doesn’t improve after cleaning and aligning the print head, you can replace the cartridge(s) causing the problem.
Follow these steps to replace ink cartridges when print quality declines:
1.Print a nozzle check pattern to determine which cartridges need to be replaced:
Windows: 
printer icon on the Windows taskbar, and then click Nozzle Check.
Macintosh: Open your application’s File menu and choose Print. Then click the
Utility button. On the Utility menu, click the Nozzle Check button.
2.Follow the instructions on the screen to print the nozzle check pattern. Then examine the pattern for gaps in the lines. You only need to replace those colors whose lines show gaps.
3.Make sure you have the correct replacement cartridges.
You must have the new ink cartridges before you continue. Once you start the ink cartridge replacement procedure, you must complete all the steps in one session.
4. Lower the output tray and open the printer cover.
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