Dead Korg T3

I assume this is a keyboard? Describe the problem in detail, someone may be able to help you troubleshoot.

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

Any thoughts would be appreciated.

Thanks,

D.E.

Hi,

It shows the T3 Logo on the LCD and that's it? Maybe you have to take it apart and repeat everything. The mainboad leaned in something metallic while you were disassembling the unit? Your service manual is printed or a pdf file?

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

du> From: "dutch" 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