I hate to be the one to say this, but so many 1200's are out there and its honestly not worth the time to repair them for me anymore unless its something easily located within an hour or two. Any more time and you run into it costing more to diagnose than just getting a replacement board.
My advice is to list it for repair parts and get a new board. They are easily found if you avoid ebay for about $150. I have even seen complete machines for $220 if you are good with a PAL unit.
