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These test procedures are described in your Printer's Operation Manual but, If You Lost It . . .  

Printing the Self-Test Pattern for Hewlett Packard 500 ® Series Printers

To make sure your printer is working properly, follow the steps below to print a printer self test:

1 - Turn off the printer

2 - Press and hold the select button on the printer control panel while turning on the printer.

3. Release the select button when the ready light turns on. Paper loads and a color and black printer self test pattern prints. The color pattern prints first. The printer's self test pattern may vary slightly from lines across the page including numbers for each of the print cells. HP numbers the print cells from 1 to 48. Each one of the print cells should show in the diagonal line running across the page. One or two gaps in the line will not be detrimental to your printing but 12 or more will cause streaks to appear even in the least important text printing.

Printing the Self-Test Pattern for Hewlett Packard DeskJet 600, 700 and 800® Series Printers

To test the print cartridge operation, print a one-page self-test pattern: With the power light on, press and hold down the resume button. After the printer begins printing, release the button.

To print a diagnostic test of technical information about your printer: With the printer turned on, hold down the power button while you press and release the resume button five (5) times. Release the power button to print the test.

To print the pen cartridge cleaning test to check the operation of the print cartridge nozzles: With the printer turned on, hold down the power button while you press and release the resume button seven (7) times. Release the power button to clean the print cartridge and print the test.

The Canon® Printer Manual gives the following procedure to clean the heads:

If any of these tests do not print, try the solution given next.

If you want to clean the print head from the operator panel, follow these steps.

1 - Make sure the green power light is on

2 - Press and hold the Resume button for at least two seconds until the printer beeps twice.

The power light will blink for several seconds while the print head is being cleaned.

Perform the print head cleaning only when you encounter a print quality problem. Unnecessary and repetitious cleaning will waste ink.

If you execute the print head cleaning while paper is manually loaded, the printer will eject the paper and then perform the cleaning.

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