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I'm having a strange problem with my Ghosts N Goblins machine. After speaking with a technician he advised me it could be an issue with my "interface chip" on the pcb.
Can anyone point out exactly what chip that is?
I'm having a problem with coining up and it's not the microswitch or wiring from the coin door. I was told by an arcade tech that I should check the "interface chip". Hoping someone can point it out on the photo I uploaded.
I never tried that jacklick. How exactly would I do that? And what would it tell me?
Short coin2 V | 18 coin1 to GND, to see if the game coins up.
So you can check if it's the PCB or the harness.
I don't want to cause any damage to the pcb so could you describe the best way to short pin out 18 with the GRD. Do I just touch my multimeter probes to both at the same time and see what happens with the game turned on? Do I keep the edge connector in place or disconnect it?
There is nothing close to pin 18 that would do any harm.. I have my G&G on the bench and there is a capacitor with its negative lead facing the card edge. I would attach a mini clip to that and then just touch the other side the exposed pcb pad/finger or use a probe and go into the harness on wire side.
It sounds daunting but it isn't. Either way you can use the negative lead of capacitor so you only have worry about one end of the jumper.
The culprit is the custom resistor/capacitor array @C5 or the 74LS367 @8A, you should determine this with a logic probe and check where signal doesn't properly toggle from HIGH to LOW when you press the button (or maybe it's just stuck HIGH).Attached schematics snippet:
Does everyone agree with this assessment or could there be another cause?