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Jurassic Park Data East Slam Tilt Problem
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Question
thegrunta666
Hi All
I have a Data East Jurassic Park that has a small issue.
When the ball goes down the left return ( switch 23 ) it puts the machine into the slam tilt reset.... mind you if you trip the slam tilt on the coin door, this also works correctly.
From what I can figure the CPU strobes the switches via connector 8 and reads the switch state on inputs to connector 10.
Therefore my guess is either transistor Q55 or 53 is false triggering stuffing up what input the CPU is looking for and getting it wrong.
Has anyone had this sort of fault before? and if so who were the usual suspects in the world of components !!!
This is the first Data East I have tackled, used to Bally machines.
So any feedback would be wonderful ( I dont want to be pulling the CPU out lots of times )
Regards the grunta
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Also can anyone tell me what the reisitor packs are, they have a +5volt rail connected to them, are they pull up resistors???? what is this black magic !!!!
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