To try manually cleaning the print heads:
Open up the printer, and look for the "carriage" that goes back and forth (on metal rails) over the paper while printing. This is the printhead.
You'll remove the ink cartridges from the printer, then clean on the bottom of them (focus on the ink port/hole) as well as inside the printer where they mate up using qtips and rubbing alcohol.
Unfortunately your model does not have a removable printhead, so it will have to be cleaned in place. Fold up a piece of paper towel in quarters the long way, saturate the middle with alcohol, slide it under the print head, and pick up on the ends while moving up and down to clean it (think of drying your back with a towel).
When cleaning the port on the print head that the ink flows into from the cartridge, also try using a qtip to "pump" the liquid down into the port and force it through, which will help to dissolve any clogs. If possible, you'll get better results by using a syringe and appropriately sized rubber tubing (that will fit into the ink inlet port) to force the alcohol to flush through the head)
After all of this swab again with a few dry qtips or give a blast of compressed air to dry everything well, then put it all back together. You can now try to print, or run the automated print head cleaning function in the setup menu. You may have to run a few pages through before everything starts flowing properly again.
If none of this helps, then you've got a faulty print head(s) which would need to be replaced.
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