I shorted the switch matrix to the high voltage by nudging a loose wire on the free kick switch into an adjacent coil terminal. I've made some progress, but the circuit diagrams in the WCS manual (as taken from IPDB) are pretty slack and I've hit a wall. Can anyone provide guidance and/or point me to schematics for WCS?

So far:

1. I started with a 'check f114 and f115' error (fuses were ok).
2 I replaced U20 and was able to get past that error. Now I have 'gnd short row 1 stuck closed'. Tests report that rows 1, 2, and 3 are all stuck closed.
3. I replaced U18, and rows 1, 2, and 3 still report stuck closed.
4. I replaced U14 and still have reports of ground short row 1, 2, 3.
5. If I unplug the 10 opto board, the errors are not reported. However, if I swap in a different 10 opto board, they are still reported, so I don't think the 10 opto board actually has any issues.
6. If I unplug the 7 opto board, the ground shorts are still reported, so I don't think the 7 opto has issues.
7. Based on pinwiki, ~13.3V AC at J101.4 and J101.7, 17.2V DC at TP8, and 12.0V DC at TP3 are all ok.
8. Based on pinwiki, voltages at some pins of J207 and J209 are NOT ok (I have listed them below), if I understand correctly and they should all be about 12V.

All this leaves me thinking the issue will lie in the in the driver board, probably some baked IC and / or burned transistors, but without schematics, I'm not sure which ones.

Voltages found in J207, 209:

J207.1 = 10.9V
J207.2 = 10.9V
J207.3 = 12.0V
J207.4 = 12.0V
J207.5 = 0.7V
J207.6 = 0.7V
J207.7 = 0.7V
J207.8 = NA
J207.9 = 0.7V
J207.10 = 10.8V
J207.11 = 10.5V

J209.1 = 11.7V
J209.2 = 11.8V
J209.3 = 11.8V
J209.4 = 10.7V
J209.5 = 11.6V
J209.6 = NA
J209.7 = 11.6V
J209.8 = 11.6V
J209.9 = 11.6V

Thanks!

Daytime bump. Anyone know if schematics for the power board exist? I'm guessing when I see stuff like the white powdery blowout on this IC (U11), it's bad. But not all bad things are visible, and I don't know which IC to check / replace.

20160607_203247_(resized).jpg

Thanks Terry! I have a logic probe. And even a usb oscilloscope, if needed.

An interesting update. The power board in my WCS is a 12697-1. I hadn't previously swapped in the power board from my NF, because it is a -3 and I didn't know if they were compatible. I noticed while trying to figure out the schematics here that the correct board for the WCS is the -3. I guess they are compatible. So I swapped power boards and still have the grounded rows.

So my next step is to replace the CPU chip mentioned by zaza (it's U23). This one wasn't mentioned in the pinwiki, so I hadn't replaced it. Another order to GPE, Ed's probably getting tired of me.

Hopefully that will clear up any CPU issues, which apparently still exist.

And then with any luck the power driver board will actually be ok (I'm assuming that I'll still have to do work on it too though).

I understand how to use a logic probe now Terry, thanks. The instructions on how to interpret the lights made perfect sense. Not sure yet how to apply it to actually troubleshooting, but I'll do some playing around with it and see what I can see.

Thanks Zaza, it turned out that replacing U23 did the trick. A couple other damaged components, but this was the main issue. What you advised isn't even documented on pinwiki, I think you've earned a wizard hat.