Hello Folks,
I bought an MH600 last fall and it came with a good set of manuals. The control you have is a bit different than the one on the MH600, but the manual seems to cover the control. Publish dates are 1986/87.
Here are some pics of the two books that might interest you and also I see you are from Canada, so I included a pic of a business card stapled inside the operating manual cover, which might be of some help to you.
(OK, after trying to submit this post, apparently I am not allowed to post links to the pictures since I am new here. I will email them them to you if I can figure out how to do that.)
If you are willing to pay for copying, I could take them someplace and have them scanned or copied for you. The Training Literature book is 116 pages and the Operating instruction is about 200 pages. If you just need a page or two, I could have a friend scan that for you.
If you need more info on the contents first, let me know.
All the best,
Davey Boy.