Welcome to the HP Forums!
I noticed that you are having trouble scanning with your HP Envy 5660 printer, on Mac OS X 10.11 El Capitan. I am happy to help!
How is the printer connected? Wireless, Ethernet or USB?
If this, or any of the posts on this thread, has helped you to resolve the issue, please click on Accept as Solution on said post. To show that you 'like', or are thankful of my post, kindly click the thumbs up below. If there is anything else I can do to help, please be sure to let me know!
Once I know this information, I will do some further research for you!
Hope to hear from you soon! 🙂
RnRMusicMan I work on behalf of HPPlease click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!