[sdiy] [OT] puzzling EPROM problem

[Theo]

heh, your right.
Actually taking off connectors and pushing them back in place is the first
thing to do in the Philps "ABC" repair instructions for TVs.
That's before the early 80s ;)
Still works well on PCs too.

Theo



From: TooManySynths <p8051 at yahoo.com>

> > 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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