I went to Tascam.com/legacy/ but not found. Usually, they have manuals on their no-longer-sold products.
However, I have a manual resource on about anything that exists and found the following for Tascam M-200 series; since yours is a 200 series it should, hopefully, cover yours. Please let me know via reply.
You may also find the Tascam forum on HomeRecording.com a mutually contributing opportunity. Probably others could benefit from your experience as well as help you.