HP DeskJet 400, 400L, and 420c series printers
Running a self-test
1. Turn the printer off.
2. Press and hold down the PAPER FEED button.
3. Turn the printer on.
4. Release the PAPER FEED button.
Running a clean test
1. Turn the printer on.
2. Press and hold down the CHANGE CARTRIDGE button for five (5) seconds.

HP DeskJet 500, 500c, 520, 550c, and 560c series printers
Running a self-test
Press FONT and RESET, or LOAD EJECT while turning on the printer.
Running a clean test
1. Turn the printer on.
2. Press the CLEAN button.
Running an alignment test
1. Turn the printer on.
2. Press the ALIGNMENT TEST button.

HP DeskJet 540 printers
Running a self-test
1. Turn the printer on.
2. Press and hold down the RESUME button until the printer starts printing.
Running a clean test
1. Turn the printer on.
2. Press and hold down the POWER button.
3. Press the RESUME button seven (7) times.
4. Release the POWER button.
Running a diagnostic test
Regular
1. Turn the printer on.
2. Press and hold down the POWER button.
3. Press the RESUME button five (5) times.
4. Release the POWER button.
Extended
1. Turn the printer on.
2. Press and hold down the POWER button.
3. Press the RESUME button twelve (12) times.
4. Release the POWER button.
Running a continuous test
1. Turn the printer on.
2. Press and hold down the POWER button.
3. Press the RESUME button ten (10) times.
4. Release the POWER button.

HP DeskJet 600, 600c, 610c, 630c, 632c, 640c, 642c, 648c, 660c, 670c, 680c, and 690c series printers
Running a self-test
1. Turn the printer on.
2. Press and hold the RESUME button until the printer starts printing.
3. Release the RESUME button.
Running a clean-test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button seven (7) times.
4. Release the POWER button.
Running a diagnostic-test
Regular
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button five (5) times.
4. Release the POWER button.
Extended
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button twelve (12) times.
4. Release the POWER button.

HP DeskJet 656c printer
Running a diagnostic test
Regular
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button five (5) times.
4. Release the POWER button.
Extended
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button twelve (12) times.
4. Release the POWER button.

HP DeskJet 710c and 720c series printers
Running a self-test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button four (4) times.
4. Release the POWER button.

HP DeskJet 820c printers
Running a self-test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button four (4) times.
4. Release the POWER button.

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 (4) times.
4. Release the POWER button.

HP DeskJet 850c, and 870c, and 890c series printers
Running a self-test
1. Turn the printer on.
2. Press and hold the RESUME button until the printer starts printing.
3. Release the RESUME button.
Running a clean test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button seven (7) times.
4. Release the POWER button.
Running a diagnostic test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button five (5) times.
4. Release the POWER button.

HP DeskJet 916c, 920c, 930c, 940c, 950c, 970c, 960c, 980c, and 990c 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 self-test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button four (4) times.
4. Release the POWER button.
Running a diagnostic test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the X (Cancel Print) button eight (8) times.
4. Press the RESUME button four (4) times.
5. Release the POWER button.
Running a duplexer test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the X (Cancel Print) button three (3) times.
4. Press the RESUME button one (1) time.
5. Release the POWER button.
The printed page, side one, will be the same as the self-test page; side two for the HP DeskJet 970, 950, and 930 printers will show "Anything is possible," printed in blue. Side two of the HP DeskJet 960, 980, and 990 duplexer test will have the HP logo printer on it.

HP DeskJet 3320, 3420, and 3425 printers
Running a diagnostic test
1. Turn the printer on.
2. Press and hold down the POWER button.
3. Open and close the top cover four (4) times.
4. Release the POWER button.

HP DeskJet 3820 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 self-test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button four (4) times.
4. Release the POWER button.

HP DeskJet 5550 printer
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 self-test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button four (4) times.
4. Release the POWER button.
Continuous "H" test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button eight (8) times.
4. Release the POWER button.
Page count test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button twelve (12) times.
4. Release the POWER button.
Two-sided printing module (duplexer) test
1. Press and hold down the POWER button.
2. Press the CANCEL (X) button three (3) times.
3. Press the RESUME button once.
4. Release the POWER button.
Media sense test
The following test will identify the type of media in the IN tray. Pages will continuously print until the CANCEL button is pressed.
1. Press and hold down the POWER button.
2. Press the CANCEL (X) button ten (10) times.
3. Release the POWER button.
4. Press CANCEL after printing one or two pages.
Pages will print with the name of the printer, the serial number of the printer, and a code indicating the type of media being used. The third line says MS Result and will be followed by one of the codes listed below:
" PLNA = plain paper
" PHTC = photo paper
" TRNA = transparency
" PRMA = premium paper
Skew measurement test
1. Press and hold down the POWER button.
2. Press the CANCEL (X) button three (3) times.
3. Press the RESUME button two (2) times.
4. Release the POWER button.

HP DeskJet 6122 and 6127 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 self-test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the RESUME button four (4) times.
4. Release the POWER button.
Running a continuous H-test page
1. Turn the printer on.
2. Press and hold the RESUME button eight (8) times.
3. Then release the power button.
Running a duplexer test
1. Turn the printer on.
2. Press and hold the POWER button.
3. Press the X (Cancel Print) button three (3) times.
4. Press the RESUME button one (1) time.
5. Release the POWER button.