Quote Originally Posted by awkwardbydesign View Post
Right, mains earth is connected to the case. Never disconnect that. From there (back of the binding post), 2 yellow and green wires go to the AC terminals on the bridge rectifier. From the + and - terminals the blue wires go to a screw post which is insulated from the chassis, and then to an insulated binding post (green wire heading out of view to the right). The white resistor and small blue capacitor are wired from chassis ground to signal ground (zero volt line on the circuit diagram). The toroidal transformer and circuit board are nothing to do with it, they are for charging the battery and powering the the remote control boards.
All clear now?
Or just ask a grown-up.
as clear as mud