HP OfficeJet Pro K550dtn User Manual

To align the printheads
Whenever you replace a printhead, the printer automatically aligns the printheads to ensure the best
print quality. However, if the appearance of your printed pages indicates that the printheads are
misaligned, you can start the alignment process manually.
●
Control panel: Press and hold 
 (Power button), press  (Resume button) 2 times, and
release 
 (Power button).
●Embedded Web server: Click the Settings tab, click Printer Services in the left pane, select
Align printheads from...

Toolbox is installed), and then click the Printer Services tab. Click Clean Printheads and follow
the onscreen instructions.
●Toolbox (Windows): Click the Printer Services tab, and then click Clean Printheads and
follow the onscreen instructions.
●HP Printer Utility (Mac OS): Click Clean from the Information and Support panel.
To clean the printhead contacts manually
After printheads are installed, if one or both printhead lights on the control panel begin to blink and
the printer will not print, you...

6.Wipe the electrical contacts on the printhead but do not touch the nozzles.
NOTEThe electrical contacts are small copper-color squares, grouped on one face of
the printhead.
The nozzles are on a different face of the printhead. Ink will be visible on the nozzles.
CAUTIONTouching the nozzles can cause permanent nozzle damage. Also, ink can
permanently mark clothing.
7.After cleaning, place the printhead on a sheet of paper or paper towel. Make sure the nozzles
are facing up and are not in contact with...

14
.If one or both the printhead lights still blink, repeat the cleaning procedure described above for
the printhead which corresponds to the blinking printhead light.
15
.If one or both the printhead lights still blink, replace the printhead which corresponds to the
blinking printhead light.
16
.Wait while the printer initializes the printheads and prints the alignment pages. If the printer does
not print the pages, start the alignment process manually (see 
To align the printheads).
To replace the...

Calibrating the color
Whenever you replace a printhead, the printer automatically calibrates the colors to ensure the best
print quality. If you are not satisfied with the appearance of the colors, you can start the color
calibration process manually.
●
Control panel: Press and hold 
 (Power button), press  (Cancel button) 2 times, and release
 (Power button).
●Embedded Web server: Click the Settings tab, click Printer Services in the left pane, select
the option to calibrate color from the drop-down...

Troubleshooting tips and resources
Use the following tips and resources to resolve printing problems.
●For paper jam, see 
Clearing jams.
●For paper-feed problems, such as the paper skew and paper pick, see 
Resolving paper-feed
problems.
Some printer problems can be resolved by resetting the printer.
To reset the printers network settings (HP Officejet Pro K550dtn/K550dtwn)
1.
Press and hold 
 /  (Configuration Page button), press  (Resume button) 3 times, and
release 
 /  (Configuration Page button)....

General troubleshooting tips
Ensure the following:
●Power light is on and not blinking. When the printer is turned on for the first time, it takes
approximately 8 minutes to initialize the printer after the printheads are installed.
●Make sure the printer is in the ready state. If lights are on or blinking, see 
Printer lights reference.
●No error messages appear on the computer screen.
●Power cord and other cables are working, and are firmly connected to the printer. Make sure the
printer is connected...

Resolving printing problems
Printer shuts down unexpectedly
Check the power and power connections
▲Make sure the printer is connected firmly to a functioning alternating current (AC) power outlet.
See 
Electrical specifications for voltage requirements.
Check the printer vents
▲The printer vents are located on the sides of the printer. If the vents are covered and the printer
overheats, the printer automatically turns off. Make sure the vents are not covered and the
printer is in a cool, dry location....

Check the cable connections
●Make sure both ends of the network cable are secure.
●If the printer is connected to a network, check the following:
●Check the Link light on the back of the printer. See 
Interpreting network connector lights.
●Make sure you are not using a phone cord to connect the printer.
●The network hub, switch, or router is turned on and working properly.
Check the printer setup for network environment
▲Ensure the correct printer driver and printer driver port are being used. For more...

Check the printer software settings
▲The printer prints slower when Best or Maximum dpi is selected as the print quality. To increase
the print speed, select different print settings in the printer driver. See 
Changing print settings.
Check for radio interference
▲If the printer is connected using wireless communication and is printing slowly, then the radio
signal might be weak. See 
Guidelines for reducing interference on a wireless network.
Blank page printed
Check for empty ink cartridges
▲Check the...