Arcade Collecting > Pinball

Roadshow switch issue - Resolved

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Zero_Hour:
Looks like I will be putting that DMM to use. Might be a day or two till I have a chance to get to it, I'll let you know what I find.

If you knew how bad my eyesight is, you'd know how funny I'm finding the "Don't use your eyes comments."

Zero_Hour:
OK THEN...

I literally had not touched the pin since I last posted. Turned it on, and decided just for the hell of it to run the SWITCH EDGE TEST again.

The good news: The switches in Column three are now responsive.
The bad news: The response is that when I close switch 3X in the test mode, the entire Row X lights up as closed, and I get the GND. SHORT ROW X message in the test.

 :dunno

smartbomb2084:
Don't know what you mean by switch 3X...

Whichever switch that is it  needs to be physically checked to see if it is shorting on something under the playfield.  Check at all the switches in the column for underplayfield shorts.

You can test U20 on the CPU with your meter too.

With the game off.. put your DMM on the 'Diode' setting and put the POSITIVE (Yes POSITIVE) meter lead on Ground and with the NEGATIVE Lead probe pins 11-18 of U20.

They should all read approximately the same...about 790 on my meter.  Pay close attention to pin 16, this is Switch Column 3 and if bad will read significantly different than the others.

Check the EDDY Board of switch 37 ( Hit Red) too. Disonnect it with the power off and see if it changes anything.

Zero_Hour:
Thanks for the info on how to test U20. I'll check the EDDY board as well.

What I meant by 3X / row X is: when I test switch 31, row 1 lights up, switch 32, row 2, etc ... For the entire colum. Sorry if that wasn't clear.

Hopefully my son will take a long nap this afternoon, and I'll have a chance to put the meter to work.

Zero_Hour:
BINGO. Pins on U20 are reading  around 580 on my meter, pin 16 reading 27.

Hopefully replacing that IC fixes the problem.

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