Did a first look over the Asterock PCB and I already found one decoupling capacitor (the small caps "around" every IC on those boards) to be physically broken (blown up maybe ?) and also the crystal is very loose. Ordered new parts for this.
There was also a small note inside the manual with various measured voltages. All looked OK, except for the 5V that was noted as 9V measured !!! Let's hope that that was with the PCB not connected (The Asterock has a self regulating power supply, much like Atari's AR-2 set-up) 9V on 5V TTL chips is NOT good....
The Power Drift plays fine but man does the cab shake when the "force feedback" is engaged. From my previous upright racer (Double Axle) I remember that the loss of tension on the springs are often causing this (like a washing machine with worn-out shock-breaks). But I'm not familiar (yet) with the Sega set-up. This "force feedback" is moving the wheel left and right, IIRC the Double Axle went up and down).
I guess I will turn it off for now....
The monitor needs a cap-kit for sure. It's not very bad, but there's some obvious "pumping" etc. going on.
I haven't even opened the SI yet....that one will need the whole deal. full artwork stencils, CPO, bezel, coin door restore, wood repairs, PCB fixed you name it.....will be last in the line I'm afraid as this is going to cost quite some money to get fully restored.