How do I enable the scan feature on my HP Officejet 6600?
Scanning is enabled by default on the device. However, to enable its functionality, you will have to download the full driver package to install the scanner drivers. This can be accomplished using the link posted below. Visit the page, select your operating system and then download the full driver package.
After the drivers are installed, you will also find all the applications required to scan on your desktop. Place a document, start the scanning software and initiate the procedure.
Download drivers: http://support.hp.com/us-en/drivers/selfservice/HP-Officejet-6600-e-All-in-One-Printer-series---H7/4322968/model/4323587