Re: Dead Korg T3

"dutch" bravely wrote to "All" (08 Oct 05 01:38:10)
--- on the heady topic of "Re: Dead Korg T3"

du> From: "dutch" <lisdon@xxxxxxxxxxxxx>
du> Xref: core-easynews sci.electronics.repair:344426

du> Yes this is a keyboard, 1990 vintage. I am a tech but not used to
du> working on this kind of instrument. Have service manual but no
du> support from KORG. Box was opened up to repair a broken programming
du> key. The key is now fixed but the instrument does not complete its
du> initializing sequence. Connections have been checked, ROMs have been
du> checked. Not sure exactly what to look for or where to look for it.
du> I have access to just about any type of test equipment and I know how
du> to use most of it pretty well. I have trouble with some of the
du> advanced analyzers.


du> Any thoughts would be appreciated.

du> Thanks,

du> D.E.


With old equipment one would do well to clean the oxidation films off
all connectors *and* any socketed IC's, rom, memory, cpu, support,
switching jack sockets, etc.

Keyboards are pretty simple machines but it is easy to overlook
something. You might simply have a stuck key. Disconnect the keypads
and be sure to test for open circuit. Look for solder bridges using a
magnifier as the smallest trail of lead is still a dead short at 1ma.

Aside from the oxidation film problem, there is always the old
standbys to check, like dry low value electrolytic capacitors in
critical circuit areas, etc. Zapped memory IC's is another problem.

Well, you get the idea, good luck!

Good hunting!

A*s*i*m*o*v

.... That was a fascinating period of time for electronics

.

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