In sci.electronics.repair John Larkin wrote:
On Tue, 22 Sep 2015 15:34:51 -0400, bitrex
wrote:

http://www.loscha.com/scans/Korg_MS2...ice_Manual.pdf

What's with the 21 resistors between AGND and DGND? That's crazy.

They're all marked "NU", which seems to mean Not Used. Other parts of
that sheet have "NU" resistors in similar nonsensical places, like
across the fuse or across the power switch. I suspect there are places
for all of these resistors on the board, but they don't populate them at
the factory except for test.

Matt Roberds