HP Officejet Pro 8000 - A811 - Manual (Page 47)

• HP Software (Windows): Open the HP software that was included with the printer.
Click the Device Services tab, and then click Linefeed Calibration and follow the
onscreen instructions.
• HP Utility (Mac OS X): Click Calibrate Linefeed from the Information and
Support panel.
To clean the printheads
To determine whether the printheads need to be cleaned, print a Print Quality
Diagnostic page. For more information, see Understand the Configuration Page.
NOTE: Cleaning uses ink, so clean the printheads only when necessary.
The cleaning process takes a few minutes. Some noise might be generated in the
process.
Before cleaning the printheads, make sure you load paper. For more information,
see Load media.
• Control panel: Press the OK button, press the right arrow to select
Maintenance and then press the OK button. Press OK again when Print Quality
appears. Press right arrow to select Clean Printhead and then press the OK
button.
• Embedded Web server: Click the Tools tab, click Printer Quality Toolbox in the
left pane, and click Clean Printhead.
• HP Utility (Mac OS X): Click Clean from the Information and Support panel.
To clean the printhead contacts manually
After the printheads are installed, you might get a control-panel message telling you
the printer cannot print. If you receive this message, you might need to clean the
electrical contacts on the printheads and in the printer. Make sure there is paper in the
printer before you start. See Load media for more information.
CAUTION: Electrical contacts contain sensitive electronic components that can be
damaged easily.
1. Open the top cover.
2. If the carriage does not move to the left automatically, press and hold the OK
button until the carriage moves to the left. Wait for the carriage to stop moving, and
then unplug the power cord from the printer.
Solve print quality problems 43