Very little help to you, I'm afraid, but I just wanted to show solidarity... mine’s the same. It used to be OK, but gradually deteriorated. I repair computers for a living, so thought I’d replace the burner, as they can be had for buttons now, but it’s been modified in a way which would be very difficult to do (unless you're an electronics engineer maybe). Even substituting another standard burner just to see made the whole thing lock up.
And I can't find anybody who’ll repair it – Yamada don't respond to communications. Wakerns.
Roger
Roger Fenton, September 2008