Re: ST4000 - circles to starboard
A very likely result of loose connections on the FET driver transistors (four of them) in the control head.
Each transistor has three leads. On mine, there were 8 bad connections out of 12 possible.
If you aren't great at soldering, leave it to someone who is.
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The question is not, "Who will let me?"
The question is,"Who is going to stop me?"
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