Firstly note that this won't work if you have any error lights on.
Turn on the printer.
Press the Setup Mode (screwdriver) button to enter the Setup Mode.
Press the A button (top left of the LCD Screen), or one of the Arrow buttons, repeatedly until "4.Head Cleaning" appears on the LCD screen, and then press the Color button (green with diamond shape on it).
Cleaning of the print head starts and "Head cleaning" appears on the LCD screen. After each clean perform a nozzle check to confirm that the head is clean and to reset the cleaning cycle.
If the print quality has not improved after repeating this procedure four or five times, turn this product off and leave it alone overnight. Then repeat head cleaning and nozzle checks if necessary.
If the print quality still has not improved, you may need a third party head cleaning fluid such as this one: http://www.powerklin.co.uk/?gclid=CNGDypir-JgCFQ4yQgodZlC4lw
Other brands are available just try googling for "inkjet head cleaning fluid".
To maintain the print quality, you should print a few pages at least once a month.
Please take a moment to rate this solution. Thanks.