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Some of these problems are found by slowly powering the set up with a variac. But getting a schematic and looking at the power supply design is most likely your first step. Relay kicking on and off is some voltage not right, too much current drain down stream, over voltage at the power supply, or possibly high voltage section is not starting, or voltage too high and it shuts the set off. Since it happens a few times a second, you have to do some thinking. Also check the internet for similar problems.
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Yes you can call me "Squirrel boy"
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