I recently acquired a Card Whiz and am attempting to correct a few issues. However, I am still struggling a bit with the schematics, which brings me to my question. In another thread " Gottliebs Card Whiz not resetting fully, Post #3" HowardR post the schematic of the Add Player Unit (see attached). What I do not understand is how is this circuit completed? I only see a path to the black. I do not see a path to the red-white. How is this circuit completed?