Date   : Fri, 09 Feb 2007 10:16:18 -0000
From   : Richard.Hobbis@... (Richard Hobbis)
Subject: B 64k - is it a lost cause?

I'll give the dishwasher a go - it has a 35 degree setting as well as 65
degrees. I'm inclined to go for a HOT wash ...

I finally got the PCB out of the case - it's a very tight fit! The
underside of the board was a little better - most of the pins in that
corner are surface rusty but the tracks between seem visually OK.

One of the ROMS has a sticker on it that reads "PRS" - any ideas what
that might be?

The inside of the case shows that the Beeb had been stored tilted and
water had got into it and pooled in the RF corner to a depth of about a
1/2 inch. That, and the fact that the rest of the case was full of dead
bugs and small bits of straw (!) does not fill me with hope of ever
getting it running again. It's a shame really, because I always wanted a
B64k, but as Ian pointed out, it's a tape-only so I wouldn't be able to
use it anyway ... 

Richard

-----Original Message-----
From:
bbc-micro-bounces+richard.hobbis=scottishwater.co.uk@...
[mailto:bbc-micro-bounces+richard.hobbis=scottishwater.co.uk@...
9.co.uk] On Behalf Of Tim Fardell
Sent: 08 February 2007 21:21
To: BBC Mailing List
Subject: Re: [BBC-Micro] B 64k - is it a lost cause?


Sprow wrote:
> In article <45CB81E0.5060305@...>,
>    Tim Fardell <tim.fardell@...> wrote:
>> Philip Pemberton wrote:
>>> Tim Fardell wrote:
>>>> Is the dishwasher really a safe way to clean PCBs? My dishwasher
>>>> doesn't have a "warm" setting - it's 65 degrees C or nothing.
>> But isn't dishwasher powder extremely corrosive???
> 
> They're strong alkalis, which is bad news for anything organic like 
> human skin as it turns fats and proteins into water soluble emulsions.

> Obviously that's great for shifting gravy and other mess off plates, 
> while not dissolving your metal cutlery.
> 
> Aluminium is not good in dishwashers as it tends to go foggy, and on 
> that basis you might find the end caps of electrolytic capacitors 
> aren't as shiny as when they went in - but on the whole the rest of a 
> PCB is just made up of
> 
>  enamel (caps and coatings)
>  fibreglass (board)
>  copper (tracks)
>  brass (legs)
>  nickel/tin/lead (solder and encaps)
>  plastic (cases)
> 
> all of which are quite happy being washed,
> Sprow.

Very interesting! I've got a mucky Spectrum PCB that could do with a 
clean! Will it take the legends off chips etc?


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