[sdiy] [OT] puzzling EPROM problem

[TooManySynths]

> 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



__________________________________________________
Terrorist Attacks on U.S. - How can you help?
Donate cash, emergency relief information
http://dailynews.yahoo.com/fc/US/Emergency_Information/