This is the printer troubleshooting document for users who have HP printers and use a Mac computer with the MacOS Sierra.
When you try to scan with the scan button on the printer control panel, or when trying to enable the scanner from the Mac with MacOS Sierra 10.12, you may come across any one of the following error messages displays:
- “Scan to the computer cannot be enabled.”
- “Connection Required: Selected computer is not available”
- “Waiting for scanner”. For regular updates and the installation process HP Deskjet 3520 Scanner