[Solved] Mudbunny - no signal when tone bypass is engaged

[misterpants]

Hi folks--

I'm building a Mudbunny board with the Creamy Dreamer BOM. When the tone control is engaged, it works beautifully and sounds great. When I use the tone bypass, however, I lose all my signal.

I've tried changing the settings on the dip switches, but I get the same result. I verified the switch with a continuity tester, and everything looks good.

Has anyone else encountered this issue? If so, what steps did you take to resolve the problem?

[benny_profane]

The relevant components for the tone bypass are the toggle switch, DIP switch, C11, C12, R20, and R21.

I would suggest reflowing the relevant pads for the passive components (the resistor pads in particular) and clean the area carefully (avoiding getting flux residue into the pots/switches). Did you confirm that the DIP switch is working properly? Also, an audio probe will be able to tell you exactly where the signal is dropping out.

[misterpants]

The issue was an incorrect resistor value at R20 and R21, causing the signal to go to ground. Everything works as expected now. Many thanks for your help.