I buy and sell old consoles and games and whenever I have a cart that refuses 
to 
work I use MAPLIN (www.maplin.co.uk) 

( N61AN ) Contact Clean 200ml  £2.50
( N64AN ) PCB Cleaner 200ml .  £3

This de-oxidises and generally helps with dry joints etc. More often than not 
this is 
enough.  The good thing about MAPLIN is that they tend to deliver very quickly, 
often
next working day !




>>> [EMAIL PROTECTED] 18 September 2006 11:16 >>>
Tony Firshman wrote:

> Ade Vickers wrote:
> > 
> > Possibly - but would a connector give up when the chip had been 
> > undisturbed for ~10 years?

> Indeed it could.  Corrosion is likely on the exposed areas, 
> and this chip gets pretty hot, so can migrate.

OK. I'm pretty sure the CPU is ok, because it works fine in another machine.
Is there a simple way to clean the socket which doesn't involve desoldering
it?

> It is worth cleaning legs of the chip (hard rubber), checking 
> pins are striaght, and then removing/replacing a number of times.
> 
> I assume J1 (expansion connector) pins are OK?

I think so - I will dig the old girl out of her box this afternoon and
check.

> If it is the original membrane be *very* careful. Tails will 
> break easily.  I bet when (if) it starts up, some keys will not work!

Not original - I've used 3 membranes over the last 20 years - I now have one
of the new RWAP ones, so I'm hoping for years of trouble-free service from
the keyboard from now on.

Cheers,
Ade.

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