Tapper test screen

CBSoria

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Anyone know why my tapper will only boot to test screen? The switch inside the coin door does nothing when flipped. It's a very clean original game, but has an arcadeshop switcher. And I can't perform any of the tests, just occasionally makes the chime noise.
 
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nice. there's a few various Midway games at work where you have to beat the snot out of the test switch to get it to register. I wonder if they just get real dirty internally. I can't remember if it was the Tron or Spy Hunter. or heck, maybe it was Pac-Man. I don't remember. :p

I don't know what wiring goes where on those, never got too in deep with them compared to the Williams games I enjoy.
 
nice. there's a few various Midway games at work where you have to beat the snot out of the test switch to get it to register. I wonder if they just get real dirty internally. I can't remember if it was the Tron or Spy Hunter. or heck, maybe it was Pac-Man. I don't remember. [emoji14]

I don't know what wiring goes where on those, never got too in deep with them compared to the Williams games I enjoy.
This fix was just a coincidence or something, but it's still stuck in test. Can't find a wire that could be grounding. When I breath on the edge connectors, the chime goes off. No idea what it is. Does anyone know if you can bypass the test, or where on the board it goes too?
 
This fix was just a coincidence or something, but it's still stuck in test. Can't find a wire that could be grounding. When I breath on the edge connectors, the chime goes off. No idea what it is. Does anyone know if you can bypass the test, or where on the board it goes too?

the wire that's bridged across the test switch and service credit will be the ground. so whatever the other wire going to the slide switch is will be the test input wire. I don't know with any certainty if the test switch is normally closed for gameplay operation and you open it for test mode. if you extract the input wire and touch it to ground you'll find out though. :)
 
unplug connector j4 from the top pcb in the stack (19 pin).
If its still stuck in test mode, look for a shorted debounce cap just to the right of j4. If its still stuck, its probably a bad ls244.
 
unplug connector j4 from the top pcb in the stack (19 pin).
If its still stuck in test mode, look for a shorted debounce cap just to the right of j4. If its still stuck, its probably a bad ls244.

thank you cdjump, Master of MCR.
 
unplug connector j4 from the top pcb in the stack (19 pin).
If its still stuck in test mode, look for a shorted debounce cap just to the right of j4. If its still stuck, its probably a bad ls244.
Could it be c120 and c121? Not sure how to test, besides continuity? Only those 2 looked suspect and had no continuity.
 
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