HP Officejet Pro 251dw Printer series - Manual (Page 83)

To clean the printhead from HP Utility (Mac OS X)
1.
Open HP Utility. For more information, see HP Utility (Mac OS X).
2. In the Information And Support section, click Clean Printheads.
3. Click Clean, and then follow the on-screen instructions.
To clean the printhead from the embedded web server (EWS)
1.
Open the EWS. For more information, see To open the embedded web server.
2. Click the Tools tab, and then click Print Quality Toolbox in the Utilities section.
3. Click Clean Printhead and follow the on-screen instructions.
Calibrate the linefeed
The printer automatically aligns the printhead during the initial setup.
You might want to use this feature when the printer status page shows dark lines
through any of the blocks of color, or if you are having print quality issues with color
printouts.
To calibrate the linefeed from the control panel
1.
Load Letter, A4, or Legal unused plain white paper into the main input tray.
2. On the printer control panel, touch (right arrow), and then touch Setup.
3. Touch Tools, and then select Calibrate Linefeed.
To calibrate the linefeed from Toolbox (Windows)
1.
Open Toolbox. For more information, see Open the Toolbox.
2. From the Device Services tab, click the icon to the left of Linefeed Calibration.
3. Follow the on-screen instructions.
To calibrate the linefeed from the embedded web server (EWS)
1.
Open the EWS. For more information, see To open the embedded web server.
2. Click the Tools tab, and then click Print Quality Toolbox in the Utilities section.
3. Click Calibrate Linefeed and follow the on-screen instructions.
Align the printhead
The printer automatically aligns the printhead during the initial setup.
You might want to use this feature when the printer status page shows streaking or
white lines through any of the blocks of color or if you are having print quality issues
with your printouts.
To align the printhead from the control panel
1.
Load Letter, A4, or Legal unused plain white paper into the main input tray.
2. On the printer control panel, touch (right arrow), and then touch Setup.
3. Touch Tools, and then select Align Printhead.
Printhead maintenance 79