> -Original Message-
> From: Maciej W. Rozycki [mailto:ma...@linux-mips.org]
> Sent: 01 October 2017 20:28
> To: r...@jarratt.me.uk; Rob Jarratt ; General
> Discussion: On-Topic and Off-Topic Posts
> Cc: 'shad'
> Subject: RE: H7878 Fails Under Even M
On Sun, 1 Oct 2017, Rob Jarratt via cctalk wrote:
> Just to let everyone know, I have now fixed this PSU. The final write up
> is here:
>
> https://robs-old-computers.com/2017/10/01/decstation-5000-model-240-psu-fixed/
>
> Thanks everyone for all the help.
Great, congrats! I see many failed
Just to let everyone know, I have now fixed this PSU. The final write up is
here:
https://robs-old-computers.com/2017/10/01/decstation-5000-model-240-psu-fixed/
Thanks everyone for all the help.
Now back to the DECstation 220, a ZX Spectrum, and then the daunting task of
fixing the TURBOchanne
mber 2017 18:42
> To: cct...@classiccmp.org
> Subject: Re: H7878 Fails Under Even Moderate Load
>
> hello,
> well it's difficult without the piece in hands to understand the circuit, and
> without the schematic, but I could give a try.
>
> 1)
> On a switching PSU, o
hello,
well it's difficult without the piece in hands to understand the circuit,
and without the schematic, but I could give a try.
1)
On a switching PSU, only one output is really stabilized, here it seems 5v.
The other outputs are "unregulated", but in some way related to the
stabilized one, for
On Sun, 17 Sep 2017, Rob Jarratt via cctalk wrote:
> Many thanks for all the suggestions. I will go through them all, although it
> may take me a while
>
> On your last point, at first I thought that there isn't any feedback from
> the machine. However, apart from a DC OK (which will be an ou
ts
> Subject: Re: H7878 Fails Under Even Moderate Load
>
> >
> > Can anyone explain the behaviour?
> >
>
> It's hard to know what to do from a distance but here's what I think I'd
look at if
> I was faced with this problem.
>
> I think failing un
>
> Can anyone explain the behaviour?
>
It's hard to know what to do from a distance but here's what I think I'd look
at if I was faced with this problem.
I think failing under moderate load could be explained by one or more of the
following possibilities and probably others I haven't thought of:
