Marantz 6320


after checking every bloody component on motor PCB problem is not solved ;

first step,in fact -second -after checking supply (-with DMM and OCR)-was to check pots (one for 33 and one for 45) ; they both are good ,according to DMM measurements and even with old analog meter-needle tracks rotation just nice.

last act of despair was to clear pots with alcohole (sometimes medical benzin is even better) and -problems with torque and speed is solved!!
must be that awful small current is through both pots.............

anyway-good school for any DD wimpy electronic ;)