Il pignone hp non funziona

@Mikaela1
 
Welcome to the HP Forums :). I would like to take a moment and thank you for using this forum, it is a great place to find answers. For you to have the best experience on the HP forum, you could also visit our HP Forums Guide for the First Time Here? Learn How to Post and More. As I understand you are getting print quality issue while printing on HP Sprocket,
 
Don’t worry though as I have a few steps to determine the issue and find a solution as well,
 
Use these recommendations to help improve print quality.

Use genuine HP ZINK® Sticky-Backed Photo Paper. ZINK® makes custom photo paper for a variety of printers, such as Polaroid, LG, and HP. HP recommends using HP ZINK® Sticky-Backed Photo Paper for best results. To purchase genuine HP ZINK® Sticky-Backed Photo Paper, go to the HP Sprocket homepage. You can also purchase genuine HP ZINK® Sticky-Backed Photo Paper from other retailers.

Clean the output rollers with the blue HP ZINK® Smartsheet from the same pack of photo paper currently in the printer. Load the blue HP ZINK® Smartsheet into the input tray with the bar code facing down and the photo paper with the print side facing up, and then send a print job.

   NOTE:
Load photo paper with the Smartsheet to avoid an Out of Paper error message.

Update the printer firmware. On your mobile device, make sure it is connected to the Internet, and then open the HP Sprocket app. If there is a firmware update available, a firmware update screen displays. Follow the on-screen prompts to complete the update.

Allow the printer a few minutes to cool down between print jobs.
When the printer becomes too warm, a Cooling down… Sprocket needs to cool down before printing another job. Wait to send another photo.message might display on the HP Sprocket app. Tap OK to clear the message.

Store the photo paper in a cool, dry place and avoid contact with water. If water spills on a photo, wipe it away as soon as possible to prevent damaging the photo.

Use clean, wrinkle-free photo paper. Avoid loading wrinkled or curled photo paper into the printer.

Make sure images have a minimum resolution of 818 × 1258 pixels per inch (ppi) for optimal print quality. Screen-captured images from your mobile device might not have sufficient resolution for optimal print quality. See your mobile device manufacturer for more information.

Click here and follow the steps mentioned under “What can I do to improve print quality?” in the article.
 
Let me know how it goes.
Cheers.