HP Deskjet 810c, 825c, 830c, 840c, 845c, 880c, and 895c series printers
Running a sample page

   1.  Turn the printer on.
   2.  Press and hold the RESUME button until the printer starts printing.
   3.  Release the RESUME button.

Running a diagnostic test

   1.  Turn the printer on.
   2.  Press and hold the POWER button.
   3.  Press the RESUME button four times.
   4.  Release the POWER button.