Unfortunately, Emerson does not publish microwave repair manuals as of 2015. However, owner's manuals for several different models are available at the official Emerson website.
From the Emerson main page, appliance owners can click on the Products link in the top menu of the website. In the Products section of the Web page, owners can click Microwaves, select the appropriate model of microwave, and click the link to the owner's manual to download it.
Emerson microwaves that are in need of repair can be shipped to Emerson for $15, as of February 2015. The support section of the website contains shipping information, including the repair facility address.