[sdiy] [OT] puzzling EPROM problem

[harry]

Sockets are rarely used in manufacturing anymore because
bean-counters run companies... not engineers and technicians.

I erll our techs if they EVER have to repair a board... put in
a socket.

It is really nice to have sockets when you are troubleshooting.

H^) harry

TooManySynths wrote:

> > Doesn't reprogramming the Eproms include lifting the
> > ICs from the sockets
> > and re-inserting them?
> > A well known repair method for C64s...
>
> Not just C64s.  That was a VERY common technique in
> the early eighties, and in fact, probably one of the
> first things frequently tried.  It wasn't even always
> necessary to remove chips, simply giving each chip a
> firm push would frequently reveal the problem to be a
> bad connection between chip and socket.  That's why
> sockets earned a bad reputation and are seldom used in
> manufacturing anymore.  Even before surface mount it
> was common only to use sockets for the most expensive,
> or most likely to fail, IC chips.  Almost all early
> eighties synths follow this. For example, in the P600,
> only the CEMs and the DAC are socketed.  The TAMA SDS9
> only sockets a CEM 3372 and the eproms.
>
> So, I would try replacing the old eprom to see if it
> works, if it does, most likely that's the problem,
> assuming you didn't try the technique of pulling
> everthing out and putting it back in again.
>
> Daryl
>
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