I was looking at a schematic today for a Top Card, trying to understand how the pop bumpers light up for 1000 pts - when they do and when they don't. It seems to depend on the I relay, whose state depends solely on the F relay:
The F relay is a mini-stepper (00-90 relay). I can't understand from the schematic how it is supposed to fire. If the switches are as shown on the schematic when the game starts, then I can't see how the F relay is connected to anything. The relay chart lists the A relay as having 5A and 1B switches, which are all highlighted below. The A relay is an interlock relay, so should stay in one position once the game starts.
Does it make a connection through the L switch and the Thousands Unit Runout switch? Then it wouldn't make a connection if the 1000 score reel is at zero...that's kind of random. Were they going for some unpredictability? Am I just missing something obvious?
Thanks