HP Officejet Pro K850dn Printer - Manual (Page 78)

6. Pull the printhead latch all the way forward, and then press down to ensure that the latch is
properly engaged. You might have to apply some pressure to engage the latch.
7. Close the top cover, and then wait while the printer initializes the printheads and prints the
alignment pages.
70 Chapter 5 Maintaining and troubleshooting ENWW