VAX 4000-500 PSU Overload?

[Robert Jarratt]

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Richard
> Loken
> Sent: 11 December 2015 16:45
> To: General Discussion: On-Topic and Off-Topic Posts
> Cc: General at classiccmp.org
> Subject: Re: VAX 4000-500 PSU Overload?
> 
> ...
> 
> My doctor once said to me that all problems in the head involve teeth and
I
> can safely make a similar exageration:
> 
> 	All electronic failures involve capacitors
> 
> And this becomes (most repulsively) even more true when switch mode
> power supplies are involved.  Keeping that in mind will usually help with
> diagnosis.
> 


Well, I have the exception that proves the rule. My H7864 PSU (from an rtVAX
1000, same PSU as MicroVAX II) had a switching transistor and resistor fail,
no cap failures....

:-)

Regards

Rob