@lewm After recap and resoldering all the joints, one bad transistor has been replaced, bad wire connection has been fixed, motor hall sensor has been replaced (donor part has been found). Platter edge has been polished, thrust adjusted (the difference was about 1.5 mm :) The minor pulsing noise from the motor (if your ear near the platter) is gone. All these solved.
The last issue was a cyclic fluctuation in motor drive JP need to troubleshoot.
It’s like a scientific lab where JP x-ray all the invisible problems.
The last issue was a cyclic fluctuation in motor drive JP need to troubleshoot.
It’s like a scientific lab where JP x-ray all the invisible problems.