Sony instruction manuals are available to download for free on Sony.com. Manuals are accessed through the "Support" section found on the site's home page and top menu bar.
There are a few options for looking up a specific manual. The easiest is to search by the specific model number. If you do not have this information on hand, you can also search by product category. This list is pre-populated.
After selecting the product type, you're provided with a list of series and model numbers from which to choose. Click on the specific model you're looking for. This will direct you to the product's webpage which contains a link to download a PDF copy of the manual.