3-band Param EQ troubleshooting

[timotheebotbol]

Hey Guys,
Novice-ish builder here, just finished populating and wiring the 3-band param EQ and tested it. Circuit doesn't work and would love some advices on how to troubleshoot it.

-Bypass signal OK
-Led lights up when circuit engaged
-No signal, no noise

-Is there any particular way to solder the rectifier? There are +/- signs on the component but nothing on the guide or the pcb

-3PDT wiring not provided in the guide, do you see any wiring mistake on the attached pictures?

Thanks a lot for your time!

[mauman]

Welcome to the forum!

The way you've wired power directly from +9V to the +9V point on the board, the rectifier isn't needed.  To use it, you'd input 9V AC or DC power to the A and C holes, the rectifier would ensure the correct polarity, and then it goes to +9V bus including the charge pump, and the ground plane.  Your wiring is fine, you just don't need the rectifier. 

For placement, the rectifier + and - legs (output) go south toward the +9V bus and ground plane, and the two wavy AC lines (input) go north toward the A and C holes.  I found the layout in the data sheet for the CBRHDSH1-40L.  If it's installed backwards, swap it around or remove it completely.

Regarding your trouble, the bypass signal is OK so the jacks and switch are OK, and the LED lights up so you have +9V coming to the footswitch daughter board.  The op amps need +18V from the charge pump, so check that you have +17 or +18V on pin 8 of the op amps.  If not, trace the +18V bus back toward the charge pump, checking the soldering of the components that come off pins 2 and 8 of the charge pump.