HP Officejet Pro K550 Printer - Manual (Page 40)

Toolbox is installed), and then click the Printer Services tab. Click Print PQ (print quality)
diagnostic page and follow the onscreen instructions.
● Toolbox (Windows): Click the Printer Services tab, and then click Print PQ (print quality)
diagnostic page and follow the onscreen instructions.
● HP Printer Utility (Mac OS): Click Print PQ Diagnostic Page from the Information and
Support panel.
1 Printer Information: Shows printer information (such as the product model number, serial number, and firmware
version number), the number of pages printed from the trays and duplex unit, the ink level information, and the
printhead health status.
2 Test Pattern 1: If the lines are not straight and connected, align the printheads. See To align the printheads .
3 Test Pattern 2: If there are thin white lines across any of the colored blocks, clean the printheads. See To clean the
printheads .
4 Test Pattern 3: If there are dark lines or white gaps where the arrows are pointing, calibrate the linefeed. See To
calibrate the linefeed .
32 Chapter 4 Maintaining and troubleshooting ENWW