Granted, this might not be a machine that it is "worth" fixing or one that is particularly "liked." However, it could be "worth it" if one wants to gain experience to try to fix something on a machine that one really doesn't care for to gain confidence to work on a variety of machines and gain knowledge of how things work and are connected, etc. There is a degree of satisfaction to be able to say "I did it."
I did find a service manual, that is
not free, for the 6200 series of Singer machines at
http://www.tandtrepair.com/6233.html
It also has a free parts list and timing guide on that page.
Janey - Neat people never make the exciting discoveries I do.