I have been thinking about a friend's Strange World (1978) and have a question regarding how it scores 500 or 5000 pts, depending on which targets/rollovers have been hit. There are 12 targets/rollovers on the pf - numbers 1, 2, 3 and 4 in white, yellow and green. Hitting any of them gives you 500 pts UNTIL you've hit all three of the same number in each color. So, for example, the first time you hit a yellow 1 - you get 500 points. If during the game, you hit all three of the "1"s (yellow, white and green), then they light up and the next time you hit a "1" of any color, you get 5,000 pts. I hope I described that clearly.
The involved circuitry is attached. I've circled the switches involved in the 500 pt circuit in red, and "squared" the 5000 pts switches in green. The Motor 1A switch is circled in blue and gives the 5 pulses to the appropriate relay (L or M). Switches 1Y, 1W, and 1G are on latched relays, so once the relay fires, those switches change state (close) and stay that way for the rest of the game.
So if I understand this correctly (and please jump in if I'm mis-understanding), let's just look at the #1 yellow target switch for now. When the ball hits the #1 yellow target, the two switches circled in red on the right close. There is now a closed circuit to the Q relay, circled in red on the left through the n/c E switch in series with it. Relay 1Y also is energized long enough to close switch 1Y in the green box, which stays closed. Q being energized then closes the Q switch down below circled in red that allows the 5 pulses from Motor 1A to get through to the 100 pt relay (M) and thus you get 500 points. It stops when Motor 2B opens toward the end of the cycle and de-energizes Q.
But once you've hit all three of the 1's (yellow, white and green), those three switches in the green square (1Y, 1W and 1G) all close. This is where I get confused. Now that those 3 switches on latched relays are closed, the next hit of any of the #1's will allow current through those switches and the n/c Q switch in series with them to energize the 5000 pt relay (E). The lowest E switch then closes, allowing the 5 pulses from Motor 1A to go to the 1000 pt relay (L) instead of to M, where they were going before.
I'm confused about the timing, though - Let's say all 3 of the latched switches in the green box are closed - the ball hits a #1 target and 2 switches close - both circled in red on the right side of the drawing. One should energize the E relays as I just described, but the upper one should energize the Q relay. Except that the n/c E switch in series with the Q relay would then open. My question is about the timing of what happens when the ball hits the target: It looks like the n/c Q switch in series with the E relay could open just as well and keep the E relay from energizing. This works, so obviously the E relay is being energized first, and locking out the Q relay, but why? Does that 10 ohm resistor in series with the Q relay have something to do with the timing of it? Do resistors slow current down? Are the switches physically placed so that the target switch that energizes E switches first? That would seem like a pretty unreliable way to do it, so I'm assuming that's not true.
Any sharp minds out there know? I'm very suggestible....