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Hi everyone, my Nanao MS9-29A is having what I've deemed to be a sync issue.

Here's a video.

I originally thought it could be 60hz interference; however, I now think it is sync as different game boards yield different results.

The Sega Touring Car manual that specifies to scope TP1 for the sync sine waves and measure the peak-to-peak voltages.

I'm worried about doing this, as this chassis is a hot chassis and does not utilize and isolation transformer or earth ground. I believe I can hook the scope up to the on board heat sink, but NOT the frame as it should be live. I do not want to damage anything, so I am wondering if anyone has had experience with the MS9 and scoping it here.

The LA7853 is a little expensive to just replace it on a hunch, which is why I'd really rather scope the circuit first.

Thank you!
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