I have a 16 track MTR90 MKII, one of the tracks wont erase. Now I checked the Erase current and I cant get over 1 volt p-p off of it when all the other cards can push 3 volts p-p or more. If I push it it distorts. I have traced it down to a general area but am at a loss in terms of which component might be bad, I feel like im chasing my tail. Plus its a bitch to desolder components on these boards so im trying to narrow the problem down before pulling out the iron. Anyone here an otari service guy?