Tools/materials: Take win7 system as an example.
1. First, on the main interface of win7 system, click the "Start" icon in the lower left corner.
2. Then in the pop-up list, click the "Devices and Printers" option.
3. In the "Devices and Printers" interface, select "Deviated Printers".
4. Continue in the Devices and Printers interface, right-click and select the Printing Preferences option.
5. In the print preferences interface, select the print head calibration option in the maintenance version.
6. In the print head calibration interface, select "4" option from # 1 to #5, and then click "Next" button.
7. Finally, in the print head calibration interface, click the "End" button in the lower right corner.