I'm trying to get this TT going but I'm stuck at the AN6636 motor drive IC. It seems operational up to the motor output. Which is absent (A1-4). If I rotate the platter manually I get signal from the field coils and drive from the S&H circuit but no drive from the box "Two phase motor drive circuit". From whatever is inside there. The Hall sensors are OK, the FG coil too. The micro switches the IC on and off (PC pin). There seems to be no current drawn at pin CS. I am totally stuck now and lacking a replacement IC ready to hand it back as unfixable. Which is very frustrating. But then, I'm not very good at mechanics...
Any ideas? Or bin?
Any ideas? Or bin?