Switching PSU Theory of Operation / Repair Tips & Techniques

From: John Honniball <John.Honniball_at_uwe.ac.uk>
Date: Thu Jul 27 06:19:58 2000

On Wed, 26 Jul 2000 22:21:47 +0100 (BST) Tony Duell
<ard_at_p850ug1.demon.co.uk> wrote:
> > The electrolytics are Mallory CGS 2900MFD 250VDC. The one on the - side
> And there's another clue. Those capacitors are rated for 250V, and yet
> you're seeing 280V across them. While they'd probably stand that for a
> short time, not computer power supply would be designed to work like
> that. So either there's a fault, or you're not measuring the voltage you
> think you're measuring.

I think Tony's spotted a very strong clue, here. Kinda
makes me suspect that the voltage measurement is going
wrong for some reason. Could there be some non-DC
component that's making the meter read wrongly?

John Honniball
Email: John.Honniball_at_uwe.ac.uk
University of the West of England
Received on Thu Jul 27 2000 - 06:19:58 BST

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