If you are having problems with premature failure of the infra-red LEDs
used in later Williams games with the opto ball trough, check to see
if the inside of the coin door mechanism is coming in contact with the LED
PC board. A good slam to the coin door may cause it to hit the ball
trough. This has even been known to cause the 270-Ohm resistors to
physically break if the door is hit hard enough. This problem happened on
Indiana Jones.
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