[HECnet] Vaxstation 4000-60 dead...

[Jarratt RMA]

My experience with mains filtering capacitors is on the MicroVAX II, which is
somewhat older, but in that case a failure of one of these capacitors causes
smoke and smell, but doesn't stop the PSU working. I don't know if a more modern
PSU would stop working if one of these capacitors failed, but I think you would
know that it had failed.

Regards

Rob


> 
>     On 22 October 2015 at 20:45 Mark Wickens <mark at wickensonline.co.uk> wrote:
> 
> 
>     One issue I had was a dry solder joint on one of the transformer
> connections to the PSU circuit board - given the weight of the transformer
> this is definitely worth checking.
> 
>     The switch for VAXstation 4000/60 & 4000/90 PSUs (they are the same
> physical unit although they have different part codes IIRC) is a 'soft switch'
> so power is applied to the input stage of the power supply as soon as the
> cable is plugged in. I'm not sure whether that is significant although part of
> me thinks that this is more likely to cause a breakdown of the high frequency
> mains filtering capacitors if the machine has been left plugged in, even if
> switched off.
> 
>     Just my 2€ worth...
> 
>     Sent from my iPad
> 
>     > On 22 Oct 2015, at 20:31, Jordi Guillaumes i Pons
>     > <jg at jordi.guillaumes.name> wrote:
>     >
>     >
>     >> El 22 oct 2015, a les 21:30, Hans Vlems <hvlems at zonnet.nl> va escriure:
>     >>
>     >> Change capacitors‎ perhaps? Had it been switched off for how long?
>     >
>     > Months
>     >
>     >
>
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