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Quoted from pinmike:Any signs of battery corrosion on the cpu?Thats the first thing that messes up the diagnostic buttons
WPC-95 CPU boards place the batteries in the upper left part of the CPU board. Alkaline corrosion usually affects other parts of that board before it affects the ICs in the switch matrix circuit.
Having said that ... alkaline goes where alkaline wants to go.
Quoted from pinmike:Damn man I was just asking before he starts digging deep.It was just a basic question.
Sorry. I think you misunderstood. I agree that alkaline can cause a problem that manifests like this. The odds on WPC-89 are much higher than on WPC-95 (but not zero) due to the battery location.
Quoted from pinmike:When I was helping guys with their pins you were still reading up on repair guides
We both don't know each other's past experience. I don't think this helps solve the problem. Let's just agree that we're both trying to help.
Quoted from Wally69:Iām stumped
It looks like there's a good +12VR (TP100 measured).
If the diagnostic switches don't work you should try to differentiate if it's the physical switches in the coin door or on the board. You can either test the switches with a multimeter or short the direct switch pins on the CPU board to verify. If shorting the direct switch pins does not work then you'll probably need a logic probe. The odds are good that it's on the CPU board but without any history or pictures of the switches they cannot be ruled out.
A picture of the CPU board (focused and well lit) will also help as problems can often be seen on the boards (such as alkaline corrosion).
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