Re: TDS794D, alleged shorted power supply?

Stephen Hanselman

You’ve probably checked this already but...

We have repaired many TDS540’s on all of them we found that the cage that the PS sits in was filthy. In particular the mesh wall between the PS and the HVPS. This will cut airflow and therefore cooling AND that the PS has a temp sensor, it can lead to PS cycling.

Hope that helps a bit good luck.


Stephen Hanselman
Datagate Systems, LLC

On Jul 28, 2020, at 17:49, Jay Walling via <> wrote:

A likely candidate if the scope is cycling on and off is the CRT assy. Easy to test for - just disconnect the ribbon cable to it.

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