HP Officejet Pro K850dn Printer - Manual (Page 68)

Maintaining the printheads
If printed characters are incomplete, or dots or lines are missing from printouts, this might be caused
by clogged ink nozzles and you might need to clean the printheads. To find out which printheads
work with your printer, see
HP supplies and accessories .
When the quality of printouts deteriorates, complete the following:
● Check the health of the printheads. See To check printhead health .
● Align the printheads. See To align the printheads .
● Initiate the automatic printhead cleaning process. See To clean printheads automatically .
● Manually clean the printhead contacts. See To clean the printhead contacts manually .
● Replace the printheads, if the problems persist after cleaning. See Replacing the printheads .
CAUTION HP is not responsible for damage to the printer that results from modifying the
printheads.
To check printhead health
Use the following means to check the printhead health. If the status of any printhead is bad, clean or
replace the printhead.
Toolbox (Windows)
Open the Toolbox. Click the Information tab, and then click Printhead Health.
Embedded Web server
Open the embedded Web server. Click the Information tab, and then click Ink Supplies in the left
pane.
Configuration page
From the control panel, print a printer configuration page by holding down (Power button),
pressing (Cancel button) once, and then releasing the Power button.
Check the message in the Printhead health line of the Printhead Status section of the configuration
page. See
Understanding and printing the configuration page .
To align the printheads
Whenever you replace a printhead, the printer automatically aligns the printheads to ensure the best
print quality. However, if the appearance of your printed pages indicates that the printheads are
misaligned, you can align them manually.
Printer driver
● In Windows 2000 or XP, click the Services tab, click Service this device, and then follow the
onscreen instructions.
● In Windows 98, click the Services tab, click Align Printheads, and then follow the onscreen
instructions.
60 Chapter 5 Maintaining and troubleshooting ENWW