How do i change the ink cartridge on my epson cx6400?

I am assuming that you already have a replacement ink cartridge.

• Make sure the printer is on.
  
• If the LCD screen says that your ink cartridge is empty than

you can simply press the Color button (the button looks sorta like a diamond with a line in the middle of it).

• If you wanna change the ink cartridge but the printer does not say that it is empty then
  

press the setup button, then press the top left button until Replace ink is displayed. Finally, press the Color button.

• Lift up the scanner section
• Wait for ink cartridge holder to move to replacement position then open its cover.
• Identify which cartridge you want to replace. Press in the tab to release the cartridge, then lift straight out.
• Before unwrapping the new cartridge, shake it gently four times. Then remove from wrapper.
• Lower new cartridge into holder, press down firmly until clicks.
• Close cartridge cover
• Carefully lower the scanner section and press it down until it clicks

These instructions were found in http://files.support.epson.com/pdf/cx64__/cx64__pg.pdf on pg 12.

You may refer to this link on how to change ink cartridge on your epson cx6400: http://files.support.epson.com/htmldocs/cx64__/cx64__rf/ink_4.htm