It could actually be a connector on the drive itself.
I had a batch of poor connectors once. I think they were on 201's though.
till, these things are mass produced, so faulty connectors can pop up.
With the drives powered down, check the resistance in all motor circuits. Right at the pins on the drives. Check both A's. Then the B's. This may not work as well if you have three different sized motors, but if they are alike and you get a different reading on one, that will help narrow down the troubleshooting.
BTW, here is that PDF I mentioned, just to get it some airtime off the Yahoo group.
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Lee |