GNR Switch Matrix Issue

FrizzleFried

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I've identified the column that is causing my credit issues... on the switch matrix... right down the line each of the switches on that column cause the action for column 1 of the same row to hit.

Example... Coin 4 is on the same row as the bottom pop bumper... when I click the pop bumper I get a credit from coin 4.

Center coin is on the same row as the right slingshot. When I click the right slingshot I get a bucks credit (center coin).... the slingshot is on the same column as the pop bumper... that entire column has issues.

What am I looking for here? The fact that I 'believe" it went from working right to doing this tells me it's likely not WIRED wrong...

What's my next plan of action? Do I check the diodes on each switch in that column?
 
I had an issue similar to this on mine. One switch added extra players, pop bumper would cause tilts, etc. The right sling coil diode went bad and took out a 4011 on the cpu. I would definately check the diodes first.
 
The top left pop bumper causes tilt... the bottom pop bumber causes a 4th-slot coin up... the left right pop bumper causes a start button (credit) push... and left sling causes a right coin up and the right sling causes a center coinup ($1.00 on mine).

While playing, if the ball gets going in the pop bumbers, I will tilt out eventually...
 
Well... i checked every switch physically for shorts and found none.

Now keep in mind I don't know what i am talking about... BUT... every switch hooked up to the green/yellow return circuit is causing something ELSE to be activated ... would it not stand to reason that the issue lies in the circuit associated with the green/yellow wire rather than 4 separate white w/colored stripe circuits?

With a single switch giving a problem that's one thing... but when 4 different switches are doing something strange... and all four have the same associated return circuit (again...is it the return circuit? Am I referring to it correctly?)... something tells me that logic dictates the issue lies with what is in common between the switches...

If that is the case... and the green/yellow circuit is the issue...what could be the cause?

OR... just say "Friz... STFU... you don't know what you're talking about ..."

:)
 
Yep sounds like that's what's going on. Check for bad diodes, then replace the 4011 on the board.

Ah...ok... so what are the symptoms of a bad 4011? How is it associated with what I mentioned above about all the issues being on the same green/yellow circuit... is the 4011 associated with that circuit? I assume if that is the case, the damage has been done it's about locating the bad diode... again ... if that is the case (a lot of IF's here) would the bad diode be associated with the Green/Yellow circuit or could it be any switch... any diode...?
 
UPDATE: I just figured out how the switch test works ... and guess what happens when I push the affected switches?
Each switch runs through a gambit of switches... some 4 ... some 5 or 6 ... so clicking the bottom pop bumper, for example, gives credit for the pop bumper... and credit for another switch... and a third... and a fourth finally ending with the credit switch at column 1.
This happens for each affected switch:
3 pop bumpers
2 slingshots (and likely the 3rd... I cant get to it to test as it's under plexi (captive)).


EDIT: According to the old data east repair guide ... it looks like I have a SWITCH COLUMN SHORTED TO GROUND. It explains how to find the short. Sound about right?
 
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