There is a print cartridge-cleaning mode in the firmware. Use this test to clear blocked nozzles.
If printouts have incomplete text or graphics that are not corrected by cleaning the print cartridges, use the pen recovery diagnostic test. The pen recovery diagnostic test is a cleaning procedure that attempts to clear blocked print cartridge nozzles. The recovery test (clean test) can be ran either from the Toolbox, by choosing Clean Print Cartridges from the Printer Services tab, or by pressing the button sequence below.
With the printer on, press and hold the Power button.
Press and release the Paper Feed button 7 times (still holding the Power button).
Release the Power button.
To verify that the cartridge has recovered, look for gaps in the nozzle test patterns (the lines located at the top and bottom of the pen recovery page). If no gaps are present on the test, the print cartridge has recovered. If gaps appear, run the test once more. If gaps still appear, replace the print cartridge.
Do not use the pen recovery test unnecessarily or the life of the print cartridge will be shortened.
Figure : Pen recovery page for color pen
Figure : Pen recovery page for black pen