Here are photos of my first RAD 4.0 tear down. The 4.0 and 3.0 appears to be the same chassis wise and circuit wise as well. So this will cover the 3.0 dis-assembly as well. Please forgive the gloomy photos it was late at night. This view shows all the major circuits inside the 4.0 the large board is the mainboard. Below that is 2 smaller boards that are just power taps. 2 wires can be seen going into both legs, those are the feet motor wires, One wire can be seen going into the arm, this is an antenna. In the head is a small secondary circuit board I think is related to one of the radio circuits. The zig zag yellow wire in the top of the head is the main radio antenna. Where as the RAD 1.0 and 2.0 had a single circuit board the RAD 3.0 & 4.0 is filled with small circuit boards. Most are just connect points making it easier to assemble the robot in stages at the factory.
Here is a close up of the main control board with the miner power connection boards.
Here is the main board in detail. If you wanted to build a robot that is voice controlled this is the board you will have to remove below.
You can make a voice controlled robot using just this board, leaving the long antenna wire and the wired microphone that is mounted in the head. Now for the head.
I believe these boards relate to the secondary Radio that transmits sound from the RAD robot. These circuits should not be required to make a voice commanded robot. You should be able to cut these wires and discard the circuits.
This yellow wire is the antenna mounted in the head. I think this radio circuit is used by the voice receiver in the RAD. Again if you are making a voice controlled robot this can be cut out and not needed.
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