My friend had serious reset issues with his tz, I replaced bridges and caps for the 5v after confirming the 5v was weak from the driver. This raised the 5v to a apparent good output, but it would still crap out with flips.

After swapping this switcher in, all was so good, that he now has an insanely low house voltage issue, at times 105v from the wall, no wpc will work and even his sterns reset, but his tz, the single worst 5v resetting machine of all time, is rock solid.

I have used these and spoke about them in other threads, and I'm convinced they are the end all for the nagging 5v issue that is not connector based, and still causing resets after all else is done. I have installed about 5 or 6 now, and each time the machine has been a rock solid war horse in play ever since.

I bought a bunch of these, one of the best replacement parts ever for pinball. Throw out those old 323s, and buy a bunch yourself.