GOING INTO DETAILS - ELECTRONICS
First, spend some time reading
SL-1210m3d Block diagram (taken from service manual)
then try to locate all the chips, and switches (you won't find all of them if you are staring in your Q2)
SL-1210m3d Service Manual (see page 19&20 for shematic)
where this overview might be helpful.
used technics semiconductors / overview (taken from service manual)
A more detailed description will be available as soon as I get hands on a better camera.