Originally Posted by miriam

I don't know if a generic manual will help or not: http://www.dontai.com/wp/images/imperial-535-manual.pdf but it looks like you got some of it figured out already.
Weird, I found the pictures on the pictures page works but not the one here... That machine is a badged Japanese machine from the 1960s or so. Here is a link for you to post pics on: http://www.quiltingboard.com/vintage...s-t207877.html
The generic zig zag manual will work to an extent. It looks like there is a big knob for zig zag and a little knob on the right that might set to hold the big knob in place. I don't know with out a close up what the little knob on the left will do - it if is 'LRC' then it sets the needle position. The buttons on the base are for the feed dogs to raise or lower. You will need one to work in the "up" position to sew. I think they made those machines to look more complicated than they really are. Is there a little door for disks on the top?