MKIV Switching Matrix: Vactrol Hades!

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fdesalvo

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Jun 13, 2005
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New Orleans to Los Angeles
Hi, all.

This chump is stumped. 5/12v power supplies are healthy, but I'm experiencing an issue detailed here:

I have a MKIV (G revision?) on the bench currently that is not allowing rhy1/2 to work independently. Whenever R1 is selected either by FS or the rear panel, both R1 and R2 LED's illuminate. When R2 is selected, R2's LED illuminates and R1's glows faintly. I can't locate any schematics around this circuit and the board states "MKIV-G" as revision. Any help is appreciated. This is Vactrol hades!
 
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