It seems to me that the motor is connected to the anode gate of the SCS, instead of the anode as it should be in both drawings there (03320.png). It would probably be easier to simply put the motor between the two pushbutton paths shown.
After comparing the figure in question with the SCS diagram in the figure above this one, I agree that 03320.png is in error. I have changed the figure in the master copy at ibiblio. Though it may be a few days before I run the build script .
by Duane Benson
by Jake Hertz