What did Ma 6 throttle circuit board remove?

Are you asking how to disassemble the accelerator circuit board of Ma 6? You need to remove the four screws on the throttle, and the throttle will come down.

Pull up the red plastic clip on the plug first. This thing won't come out. Just pull it up, because it's the first time. This clip won't come off after a long time, and then unscrew these four screws.