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Tektronix 7633 and 7854 mainframe troubleshooting tips.

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lapoltba

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So I acquired these two scopes when my scholl was throwing out a bunch of equipment. I got a ton of plugins for them too. I have one working 7854 but the other one and the 7633 both will not turn on at all. They immediately blow their fuse. I am assuming it is most likely an issue with the power supply, and probably the capacitors.

I was hoping to get some suggestions on where to begin troubleshooting these behemoths and what I should be looking for.
 

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