This protection thing actually works. I got the power supply "kinda"
working, and for an example:

If i turn it on ok, then shut it down, then take out the power plug from
the motherboard and turn it on, the fan starts spinning then stops. If i
plug it on again, it will only start again within 10 mins.

Tiago de Aviz
--------------------
www.softsell.com.br
mailto: Tiago@softsell.com.br



> -----Original Message-----
> From: yosch@fif.mw.htw-dresden.de 
> [mailto:yosch@fif.mw.htw-dresden.de] On Behalf Of Uwe Lienig
> Sent: Thursday, September 27, 2001 3:08 AM
> To: Tiago de Aviz; port-pmax@netbsd.org
> Subject: Re: DECstation 5000/33 Power Supply
> 
> 
> Manuel Bouyer wrote:
> > 
> > On Thu, Sep 27, 2001 at 02:20:38AM +1000, Simon Burge wrote:
> > > "Tiago de Aviz" wrote:
> > >
> > > > Did anyone ever have problems with the Power Supply of the 
> > > > DECstation 5000/33? Mine simply doesn't turn on anymore...
> > > >
> 
> Yes, I did.
> We had a strong flash hitting the local power station.
> After that only one of the three running 5000/xx came back. I 
> thought, the the power supplys of the others were gone. I 
> kept them for spare parts. After a couple of weeks I had to 
> reorganize my stuff. Because I couldn't remember which of the 
> 5000/xx went away I swtiched them all on again - and they 
> were back again
> - all !!
> With any knowledge what protects the power supply from beeing 
> destroyed by flashback. But I learned, that one should not 
> switch off an on the 5000/xx to fast. Wait a minute after 
> switch off. If not, the power supply goes into some kind of 
> protection mode, which lasts I think somewhat 10 minutes.
> 
> > > > It was on for two days, then when i turned it off, never came 
> > > > back. What could be wrong? Fuses? Parts? Nothing like storms 
> > > > happened around here... So...? I dunno.
> > >
> > > I had a friend drop around just yesterday with the same problem.  
> > > From memory, the fan(s) started to spin but stopped 
> almost straight 
> > > away, and the power LED doesn't come on at all.  He 
> picked up a CRO 
> > > that I had here; if he manages to fix it I'll ask what he did...
> > 
> > Did you have some load on the power supply when you tried this ?
> > 
> > I had a sparc IPC power supply showing the same behavior, which 
> > started working again when I connected a HD to it. 
> Obviously the IPC 
> > mainboard doesn't suck enouth power for this power supply.
> > 
> > --
> > Manuel Bouyer <bouyer@antioche.eu.org>
> > --
>