Touchdown
Gottlieb, 1984I have a switch stack on a Gottlieb System 80A.
The EOS switch works fine, but there is an extra switch on top of that that is permanently shorted when it's screwed down (according to a multimeter test). As soon as I unscrew it, and test the switch leaves with a multimeter, the problem goes away. As soon as I put the screws back in, the problem returns.
Is there something I should be doing in order to prevent the screws from making contact with the leaves of the switch?
Do you have the little plastic tubes in there that the screws go through?
Looking at the pix, the top leaf is in direct contact with the screw plate. Have you tried installing a thin wafer (or fishpaper) there to separate them?
I couldn't quite make out the lugs, but it looks like the white/purple is globbed together on two lugs? Maybe the top switch is getting shorted by the N/C EOS switch through the lugs?
Quoted from cody_chunn:Do you have the little plastic tubes in there that the screws go through?
Looking at the pix, the top leaf is in direct contact with the screw plate. Have you tried installing a thin wafer (or fishpaper) there to separate them?
I couldn't quite make out the lugs, but it looks like the white/purple is globbed together on two lugs? Maybe the top switch is getting shorted by the N/C EOS switch through the lugs?
There's no plastic tubes. Does anyone sell them?
There is no connectivity between the EOS switch and the other switch. The angle of the photo makes it look like the wire is on two lugs, but they're actually separate.
Most leaf stacks like this have plastic tubes that the screws feed through. I'm *assuming* this stack is the same. Is there a bit of slop in the holes where the screws feed through?
Pinball Resource probably has the tubes.
Quoted from cody_chunn:Is there a bit of slop in the holes where the screws feed through?
I'm not sure, I'll have to take a closer look. It didn't seem like there was very much space.
Quoted from Cheddar:I imagine heat shrink tubing could be used as a short term fix and the verify the solution. It wouldn't need to be shrunk of course.
That is a clever idea. 
I'll have to see if I have any that is small enough to fit.
Check the fish paper pcs. on the switch stack...I can see 2. They are there to 'insulate' so another option for a fix.
Quoted from Cheddar:I imagine heat shrink tubing could be used as a short term fix and the verify the solution. It wouldn't need to be shrunk of course.
I have done this, it works. I had stuff that was too large to fit, so i left the bottom of the screw bare and heated the rest around the screw that wnt through the stack.
I ended up adding heat shrink tubing on the screws, which stopped the switch from shorting. Thanks for the suggestion, Cheddar
Quoted from Cash_Riprock:Check the fish paper pcs. on the switch stack...I can see 2. They are there to 'insulate' so another option for a fix.
There was fish paper between the EOS switch and the switch on the top of the stack. There is also a non-conductive spacer between the two leaves of the switch on top of the stack. The problem was that the screws were making contact with all the parts in the top switch.
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