RV........
Here is the link to Bally Bingos website. He explains the complete operation of "How Bingos work'.
Bookmark the site for future use.
"How things work"..
http://bingo.cdyn.com/techno/howtheywork/
You could check here first....... as stated above; make sure you have 8 balls in the trough!
"Ball lifting".....
http://bingo.cdyn.com/techno/howtheywork/ball_lift/firstball.html