Rootbeer Tapper won't pour....

Robran68

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Donor 2011
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Anyone ever have this issue? I checked continuity from the board to the tapper sticks and it was good. Both tappers are not working but the joystick is working fine.
 
have you checked the voltages? I have seen some weird shit happen with tapper when the +5 dropped below 5v at the legs of the ram chips.
 
The main CPU board goes across the ribbon cables and reads these controls on the SSIO board. Check it systematically by working your way backward:

- Use your DMM on resistance, with the game off, and make sure the switch is closing.
- Enable self-test, test all switches (coins, start buttons, etc) and see what the game recognizes.
- I don't have a tapper pinout, but use your DMM on voltage at the SSIO connector J4 or J5. The line should be pulled to +5 normally then grounded when you close the switch.
- Repeat the same test at the leg of the chip. Looks like B2, E2, and F2 on the SSIO handle the inputs.
- If the switch looks good at the leg of the input chip and the game still doesn't recognize the switch closing, suspect a problem on the buffered data bus.
 
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