You can overlay text to attribute credit, and use wiki markup to add attribution, e.g. Per our Content Licensing Policy, any licensed content you upload must be compatible with iFixit’s Creative Commons BY-NC-SA 3.0 license, and that is the license that will be listed in the image metadata (e.g. https://www.ifixit.com/Guide/Image/meta/...). Since the image in question is under CC BY-SA 3.0, all you’ll need to do is add the caption as noted above.
Per iFixit's Content Licensing Policies: Original Author Materials you submit to iFixit must be from one of three sources: (1) Content you own the copyright to because you produced it yourself. (2) Content that is in the public domain. (3) Content that is licensed under a compatible license. So the answer depends on whether the service manuals are subject to copyright restrictions that allow this use, or not.