VT100 PSU smelling.

Mattis Lind mattislind at gmail.com
Fri Jan 22 18:00:13 CST 2016

2016-01-23 0:32 GMT+01:00 Peter Coghlan <cctalk at beyondthepale.ie>:

> >
> > R27 is part of the snubber network on the primary side of this
> forward-type
> > SMPS PSU. But why it it getting so hot. Is it normal? I have completely
> > forgotten how a VT100 smell when running...
> >
> Snubber as in a resistor in series with a capacitor across the primary?

Yes. It is a R, C, D network.

> If so check the capacitor for leakage (electrical, not liquid) or being
> shorted.

I don't have a ESR meter or similar. It is not shorted at least and the
resistance is in the several mega ohm range when measuring in circuit. Are
they likely to go bad in a non catastrophic way?

> Regards,
> Peter Coghlan.


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