HP7520 Still can't scan to computer (Mac)

I've seen NUMEROUS posts from folks with the same problem:
The "Scan to Computer" function on the printer doesn't work, even though all other printer functions between the computer and printer work fine.  Printing works fine.  Scanning from the computer works fine.  
The printer's display shows the computer name when Scan-to-Computer is selected.  But when the scan is initiated, I get a message on the computer:
"Scan failed - an error occured while communicating with the scanner"
and a message on the printer:
"No Connection - no computer is connected..."  
But of course the computer IS connected!
On the Mac, the HP Utility's "Enable Scan to Computer" button is grayed out, with the explanation that the HP software required for Scan to Computer could not be located.  Nothing I do let's me enable it.
Numerous posts on this forum, for this and other HP AIO printers, say to uninstall all the HP printer software and drivers, repair disk permission, reinstall the Full Feature printer software, and reinstall the printer drivers.  
Did all that multiple times.  Same problem.
Scan-to-computer used to work at one time and I used it routinely.  Not sure exactly when it stopped, but may have been after upgrading to OS10.9.
Has anyone actually solved this problem?  All the posts I've seen on this problem seem to end without resolution.

Hello jonnie_s,
Welcome to the HP Forums!
I understand when scanning from the Photosmart 7520, you receive a message "Scan failed - an error occurred while communicating with the scanner". I will do my best to assist you!
How is this printer connected? Wireless or USB? I realize you did state that your operating system is 10.9, but are you running the upgraded version such as 10.9.1? Please let me know on this post.
Have you performed all the Apple updates on your computer? If not, could you please follow this Apple document here. When you reinstalled this HP software, did you use the CD or the HP website?
I would make sure you have completed every step from this HP document on A 'No Computer Detected' or 'Connection Error' Message Displays during Scanning.
I will be looking forward to hearing from you. Have a great night!
I worked on behalf of HP.

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