Enter the world of easy DIY
http://www.e-licktronic.com/forum/
I'm just wondering.... can this be a source of the noise levels that many have? I have not done this fix since mine worked just fine. But could there be interference between these points when they are so critically close?comboy wrote:Daaaang! I found the problem!
The right 'standoff' from VR14 is placed directly above a via carrying the signal from R12A to the 4069 VCC pin (14).
Since the standoff is connected to GND and touches the untented via when the pot is fully inserted, it shorts the output of the opamp down to GND, eliminating the 4069 supply voltage.
This was a hard one to find! but at least the mid tom is working now, too
Is this linked to my problems Comboy do you think? viewtopic.php?f=24&t=1156#p7165comboy wrote:exactly - the tiny little hole.
That's what made it so hard to find.
The corner of the pot poked exactly into this tiny hole
Ive tested continuity between GND and Pin 14 of IC22. No continuity. In fact not one pin from IC22 is connected to GND. Does that mean my problem is not the GNDing of the VR14 stand off?comboy wrote:Daaaang! I found the problem!
The right 'standoff' from VR14 is placed directly above a via carrying the signal from R12A to the 4069 VCC pin (14).
Since the standoff is connected to GND and touches the untented via when the pot is fully inserted, it shorts the output of the opamp down to GND, eliminating the 4069 supply voltage.
This was a hard one to find! but at least the mid tom is working now, too
R12A is also not connected to IC22 (4069) pin14. I can't see properly on the schematic if it is supposed to. 909 and Nava Schematic. 
