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It's been a couple years since I worked on one of those models. But if my memory serves me correctly, there are a couple pots on the Y/Z boards that you can tweak to fix the "sparkles". Seems like one of the main ones was labeled "Vscan" or something similar. I am sure there is a "correct" way to do it with a meter, but I always just did it hot and eye-balled it. Maybe somebody who has worked on one more recently can jump in with more up-to-date info.
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