Toyota 830 motor

I am having problems with my Toyota 830. When I turn the machine on, the wheel will turn, the needle will move up and down a few times slowly and then I get a motor lock alarm. Sometimes, I can hit the stop button and it will be fine and ready to sew. Other times, the motor lock alarm will sound again and I have to shut the machine down and try again. I have purchased a motor from another 830 that is being parted out and tried it. At first it seemed to work fine, but then it started doing the same thing - just not every time I turn it on. I have switched the original motor and the newest back and forth. The newer motor definitely works best but it is unreliable and I am afraid that is on it's way to the same end.

I have spoken to 2 different techs and they have different opinions. One feels like it is quite obvious that it is the motor - he's seen it many times. The other says that he has never seen a motor failure and feels like it is probably something else. Both technicians have a tremendous amount of experience, so this makes it tough to know which direction to turn.

I am trying to locate another motor since this newest motor did come from an old 830 that is being parted out - it very well could be bad as well. I will be able to return it and get my money back. Does anyone know where I might be able to find another one to try?

Has anyone seen this problem before and have any suggestions as to what it might be. If I felt like it was something that could be repaired, I would have a tech come look at it, but I'm afraid it will just come down to discontinued parts.