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From: N_Cook on 11 Mar 2010 09:41
Yamaha EMX640 that should be


From: hr(bob) hofmann on 11 Mar 2010 12:00
On Mar 11, 8:41 am, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> Yamaha EMX640 that should be

Can you encapsulate the whole area with silicone rubber to shield the
area from future shocks (mechanical that is)??
From: N_Cook on 11 Mar 2010 12:31

hr(bob) hofmann(a)att.net <hrhofmann(a)att.net> wrote in message
news:dcb91d0f-9939-41e6-af36-f2bcdb87c1fe(a)z4g2000yqa.googlegroups.com...
On Mar 11, 8:41 am, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> Yamaha EMX640 that should be

Can you encapsulate the whole area with silicone rubber to shield the
area from future shocks (mechanical that is)??


If the trouble returns I'll desolder it , solder in a turned pin socket ,
plenty of height available, and try HY62256 or TMS62256, same pinning as the
original


From: Michael A. Terrell on 12 Mar 2010 21:57

N_Cook wrote:
>
> Its a balance of probabilities type thing. If/when the problem returned the
> amp was useless then yes but the problem is just in the echo section, easily
> switched out using the front panel sw. Owners were using sans echo and only
> one pa chanel functional for some tome until a problem emerged on the other
> pa ch. If I knew for certain that a TMS62256 or other common SRAM would
> replace the W24257-70LL then I would go ahead replacing now. The process of
> desoldering the original is more likely than not, I would suggest, to make
> the original non-functional by any amount of surface pressure applied to the
> IC casing


The probability is very high that it will come back. I would never
return something to a customer with a defect like that. Of course, that
is why my callback rate was always under 1%. It's also why I never
needed to advertise my shop.


--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'
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