sk150 mark 3 A adjustment prob;lems

I have a kobelco sk150 lc mark 3. The stepping motor was bad so I replaced it. When I went to do the A adjustment it wouldn't let me into the cpu program. Took cpu out and had a company go through it and they found a component burnt up inside. I put the cpu back on and I was able to get the A adjustment started. The final step I have to start engine and turn off auto accel to do a sweep on stepping motor. Problem is the auto accel switch doesn't work when cpu is in test mode but works when cpu is in work mode. any ideas would be greatly appreciated!! thanks :Banghead

sk150 mark 3 A adjustment prob;lems