If these are switching power supplies, the fizzing may be the output filter
caps
overheating and about to pop their safety 'corks' due to self heating due to
high ripple currents.
I can across this probelm in a Clary Datacomp 404 computer that I worked
on in the late 60's. The initial fix was a plastic sheild across the top of
the caps
so that if they vented while a tech was working on the unit, they would not
spew
the fluid inside them into the tech's face.
Karl
----- Original Message -----
From: "Adrian Graham" <wit...@binarydinosaurs.co.uk>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk@classiccmp.org>
Sent: Friday, July 22, 2016 3:36 PM
Subject: Re: Reproduction micros
On 22/07/2016 10:04, "Pete Turnbull" <p...@dunnington.plus.com> wrote:
On 22/07/2016 00:33, Adrian Graham wrote:
On 22/07/2016 00:07, "Liam Proven" <lpro...@gmail.com> wrote:
There were only a few
made. They were used internally during development - hence the podule
to
connect it to a Beeb, which provided the I/O early on - and in the
later
stages before the Archimedes launch in 1987, several were loaned to
software
developers.
This is the machine Dick Pountain reviewed, I think.
Pretty sure I've got 2 of those, the keyboards are made of Dark Matter.
I've
never dared power one up though.
If you have those, I would strongly recommend you arrange an offsite
backup. Say, about 170 miles north via the A14/A1 :-)
I remember why I've never fired them up, this is the label on the one with
the Beeb connecting podule:
http://binarydinosaurs.co.uk/acorna500label.jpg
Of course 'smoke' in these PSUs just means the mains cap has blown but I'm
not sure about the fizzing.
--
Adrian/Witchy
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
collection?
