I have a scared stiff on location. Getting bad trough opto message on boot and cycling balls out. Replaced the power driver and it worked for a couple hours then did the same thing. Replaced the trough optos, cpu and 16 opto board under the pf. Other 3 optos that share the trough on the row work. Trough optos show a glow when using cell phone camera so they getting 12v. Get tone on the green-orange wire from the cpu to the 16 opto board and getting tone from the connectors from the 16 opto board to the trough board connectors. Any ideas ?

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So the game is now in the shop. I have done the following

All optos work that are highlighted in blue on the attached pic and I don't think this is a simple switch matrix wiring issue
Toned all associated wires from the CPU to the 16-opto board and from the 16-opto board to the trough connectors
Toned the column white/color wires from the 16-opto board to all switches on their respective columns
All test points on the power driver board read correctly
Opto boards and 16-opto board have 12v
Opto boards show glow in cell phone camera confirming they are getting power
Swapped the 16-opto board with a known working from a Champ pub
Removed all unnecessary connectors on the power driver to eliminate any possible issues

Prior to this coming in the following was done

CPU was replaced with Rottendog
Power driver was replaced with Rottendog
16-opto board was replaced with NOS
Trough boards was replaced with Anarchy trough boards

Previous to this failure and before the machine went on route the original CPU and power driver was rebuild by Coin-op cauldron so they should be legit.

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So got it up and running. I think we had a couple of issues going on. I think at first the connector on the power driver that provides the 12v to the 16-opto board was tarnished or whatever and failed to provide power. After it worked for one night after the power driver was replaced and the connector was essentially reseated, the connector stopped working and then we shotgunned and replaced everything since it was in a remote location to me. Unfortunately the anarchy opto boards were DOA and compounded the problem. And they had some odd solder work on them also when they were made. There was also a broken opto on one of the OG boards that was very hard to find

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