Korg Forums

[jjbunn]

I have a MicroKorg with the flakey behaviour associated with loss of the 3.3V supply (unresponsive pots, many functions unavailable etc.).

Looking around the 3.3V circuit, the regulator chip IC5 looks a little burned at the terminals. I measure 9.5V on its input and 4.99V on its output.

Anyone know where I can buy a replacement? The component is a Seiko IC-S-8520F33MC ... Mouser used to have it, but no longer, Jameco don't have it, nor do Newark: it appears to be obsolete.

(The 8520E33MC looks to be a better choice, as it has overload protection, but I can't find that available anywhere, either.)

I wonder if, in a pinch, I can replace the IC with a 3.3V Zener and a resistor ...?!

Any advice most welcome.

[jjbunn]

I'll answer myself: http://www.korgparts.com/ have the semiconductor parts. I ordered two of IC5, one of F1 and a Service Manual from them.

I'm hoping the CPU itself isn't damaged, because replacing that sounds like a very ticklish operation.