Follow the steps below to set up the hardware.
Step three: Install tray 2 (HP Officejet Pro K550dtn and K550dtwn)
Tray 2 is an accessory tray that holds up to 350 sheets of
plain paper. Tray 2 comes with the HP Officejet Pro K550dtn and K550dtwn printers, and is an optional accessory for the HP Officejet Pro K550.
Set the printer on top of tray 2.
OPMERKING:Be careful to keep your fingers and hands clear of the bottom of the printer.
Figuur 3: Placing the printer on top of tray 2

Step nine: Align the print cartridges
To ensure the best possible print quality, the printer initializes and aligns the printheads. At the beginning of the process, the Power light blinks and the printer prints a status page. At the end of the process, the printer prints the alignment pages (colored pages).
This process takes approximately 8 minutes.
If the alignment process does not print pages, complete the following steps.
Check the following on the printer:
The power cord is firmly connected.
The printheads and ink cartridges are properly installed.
The rear-access panel (HP Officejet Pro K550) or the duplex unit (HP Officejet Pro K550dtn/K550dtwn) is installed.
Turn off the printer and then turn it on again. The alignment pages should print.