The HP website offers a user manual for the entire series of HP Deskjet 1050 printers, as of 2015. The one user manual applies to the entire series of printers, including the Deskjet 1056.
From the main page of the HP website, hover over the Support tab, and click on Support & Troubleshooting. On that page, locate the text box under the Find My Product header, type "Deskjet 1056," and then click Go. From there, click on the link from the HP Deskjet 1056 All-in-One Printer - J410a from the list displayed. This takes you to the product page for this printer. From this page, click on User Guides, and select your language if necessary. There is a list of three PDF files, including the User Guide, Setup Poster and Reference Guide. Click on the one desired.
Depending on your computer and Internet browser settings, the document either appears in your browser in a new tab or downloads to your computer's hard drive as a PDF file. The User Guide contains information on how to use, maintain and repair the printer. It outlines the specifications of the printer's hardware and instructions on how to use the printer with the software.