I made some efforts in order to damp ETMY, however it still doesn't happily work.
It looks like something wrong is going on around the whitening filters and the AA filter borad.
I will briefly check those analog parts tomorrow morning.
- - -(symptom)
Signs of the UL and the SD readouts are flipped, which I don't know why.
At the testpoints on the analog PD interface board, all the signs are the same. This is good.
But after the signals go through the whitening filters and AA filters, UL and SD become sign-flipped.
I tried compensating the sign-flips by changing the sign by means of the software, but it didn't help the damping.
In fact the suspension got crazy when I activated the damping. So I have no idea if we are looking at exactly right readouts or some sort of different signals.
- - -(fixing DAC connector)
I fixed a connector of the DAC ribbon cable since the solderless connector was loosely locked to its cable.
Before fixing this connector I couldn't apply voltages on some of the coils but now it is working well.