Have you manually tested each opto in the clock?
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Quoted from gac:Thanks jalpert. Do you know offhand where the other end of the connector (not the plug on the clock board) connects? Maybe a pin issue there?
It's most likely an opto issue and not a connector issue. Take apart the clock and only plug in the opto boards, don't worry about the motors being plugged in as we know that works fine. I'm pretty sure you can go into the regular switch matrix for these optos to appear. Now just sit back without moving anything on the machine and keep an eye on the matrix. What will probably happen over time is you will hear random beeps and see various blocks on the matrix go in and out. These are your faulty optos. Since the boards are already out, take a look at the back of the intermittent optos and make sure you've got no holes or noticeable issues with the solder spots. If that's all good, I, personally, would just replace any of the bad optos, but if you'd rather not get involved with soldering, see if you can return the RottenDog board with the faulty optos (they may have a warranty on these, but I'm unsure). I'm going to assume that only one board is the culprit for your faulty optos. If both boards have faulty optos and both boards are new, then RottenDog definitely got in a bad batch of optos or there could be an over voltage/grounding issue which is blowing your optos. I've worked on at least 10 TZs (mainly ones that are still being routed) and any boards that were completely fried beyond reasonable repair, I've replaced with RottenDogs and they still work to this day.
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