Reproduction micros

[Karl-Wilhelm Wacker]

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" <witchy at binarydinosaurs.co.uk>
To: "General Discussion: On-Topic and Off-Topic Posts" 
<cctalk at classiccmp.org>
Sent: Friday, July 22, 2016 3:36 PM
Subject: Re: Reproduction micros


> On 22/07/2016 10:04, "Pete Turnbull" <pete at dunnington.plus.com> wrote:
>
>> On 22/07/2016 00:33, Adrian Graham wrote:
>>> On 22/07/2016 00:07, "Liam Proven" <lproven at 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?
>
>