Replace Printhead

On the touchpad press maintenance > Printheads, then tap any printhead to see its status

To view the what each status means go to page 124 of the HP Knowledge Base

The procedure may be started by responding to an alert, or from the Printhead detailed information screen

From the Printhead detailed information screen, tap Replace to be guided through the procedure

HP 3D450 Color Printhead Kit (found in HP cabinet)

Nitrile Gloves

T20 Torx Driver (found on the tool wall)

Lint-Free Cloth

You will need a new priming tray (included in the printhead kit), and the alignment plate included with the printer (agent door)

Once the procedure is started, close the top cover so the printer can complete pre-checks

When the checks are completed, open the top cover

Ensure that you have cleaned the print area since the last build

Open the agent door and take the alignment plate from inside the door

Ensure that the alignment plate AP number matches the number on the inside of the agent door. Close the door

Tap Continue on the touchpad

Place the alignment plate on the build platform and then the priming tray on top of the alignment plate.

Make sure the priming tray nests into place on the alignment plate by matching the feet on the bottom of the tray to the cutouts on the alignment plate

Do not place the alignment plate and the priming tray on the build platform outside this procedure.

The black foam top is an essential part of the priming tray assembly. Do not remove it

Close the top cover and tap Continue on the front panel. The print carriage will move to the left, then you can open the top cover again

Inspect the printhead cap(s). If you see any liquid in the cap(s), remove it by blotting with a dry, lint-free cloth

Use the screwdriver to loosen the six screws to remove the cover from the carriage, and carefully set aside the carriage cover

Release both clips, and lift the print-bar cover over the carriage. It will magnetically stay in place

Loosen the two thumb screws at each end of the printhead until the printhead is released

Carefully pull up the handle to remove the printhead, and place it on a flat surface with the nozzles facing up or to the side

Vacuum the inside of the carriage if necessary

Remove the packaging from the new printhead

After removing the orange shipping caps, avoid touching components on the bottom of the printhead, and avoid putting the printhead down on the exposed nozzles

The monochrome and color printheads are shaped differently; furthermore, the side of the monochrome printhead is grey, while the side of the color printhead is purple - make sure it is in the correct slot

Remove the two orange caps and put them onto the old printhead

Orient and align the new printhead, then insert it into place, using the center post to guide the printhead. Ensure that all edges of the printhead lie flush with the carriage housing

Push down and firmly tighten both thumb screws

Pull down the printhead cover over the printhead, and secure both clips

Put back the print carriage cover. Tighten the six screws

Tap Finish & Check. Leave the print carriage centered. Close the top cover and tap Continue on the front panel; when the priming tray is detected, tap Prime.

When priming is complete, open the top cover, carefully remove the used priming tray, and leave the alignment plate in the build chamber, for use during the printhead alignment process.

Place the used priming tray in the bag in which it came, and dispose of it according to local regulations

Launch the printhead alignment from the front panel by tapping Calibrate printheads

The printer cannot print until alignment has been completed