This is on a Super Orbit. I have installed a new Swemmer board and replaced the MPU/Driver wired connectors with new. I have validated continuity from switch matrix connector to first point on MPU board. System has Rottendog power supply board and all voltages are good. The tilt relay does not turn on. The displays all have the appropriate power, just display 1 and 3 are being used.

The system boots consistently with a "1" in the 10s position on Display 1 and 3. When I turn off the machine all the displays flash all zeros for a short burst so I'm pretty sure they are good.

I have checked for shorted 74## chips tied to the switch matrix and they are all good. I have validated the correct diode reading between the switch matrix strobes and returns.

Anyone know the boot up sequence and what this 1 means?

Rusty

Display shows a 1 instantly. Here are the dip switches. There is a specific game ROM on the board so the switches do not select it.

KIMG0784.JPG

If I unplug A1-J5 I get all zeros in all displays.

I tested continuity on the slam switch back to the board and it was good. I soldered the slam switch override points together just to rule it out or in. With the slam switch points soldered together and the all the plugs back in, I still get 1 in the displays.

After a month long bout with Covid and her ugly step-sister Pneumonia, I am back to work again.

To continue from the last post... with all the connections made test mode button makes no change. The test button is working properly. I tested both sides of the coin lockout coil to ground of the door and there is no continuity. A1-J5 was verified to be making good contact and continuity validated through to component on board. I also tested the connection of A1-J6 just for giggles and it tested good to board components.

Could a bad sound board create this issue? Is there somewhere I can look at the code (I'm a programmer by career) so maybe I can figure out what is making the 1 show up consistantly?