Pauper fatigue

[Mike McLane]

Just built a new Pauper, but it won't give me a peep !!! I get the guitar thru the bypass, but the only thing I get when powered on is a pop when switching from BOOST to OD. I have double checked all component values as best I could, re-melted all of the solder joints and double checked that the foot switch is functioning properly. Still no change. The Op Amp and the MA856 diodes came from a previous build that went "south" when I inadvertently damaged the PCB. Was wondering if the IC is possibly shot from the wear & tear of the previous build. I included a gut shot just in case. Any suggestions?

 

[Paradox916]

Is D5 going the right direction? Is that giant 1uf cap grounding out? Is there a dust cover on the tone pot?... pics of the other side of the PCB would help

 

[Mike McLane]

Big Monk: How to on the IC voltages. . . . power up and measure each terminal to ground, terminal to terminal? Paradox: D5 is correct, C15 is not grounding out, TONE pot has dust cover. Underside pic attached. Note: I did have to use a solder lug pot for the B25K TONE pot, but don't see how it could be a problem to the build. Thx in advance for all your help.

 

[Mike McLane]

I measured dcv from each IC pole to grd and got the following :

Power supply voltage is 9.38 . . . .
1 - 1.347
2 - 1.347
3 - .816
4 - 0
5 - 9.4
6 - 8.42
7 - 8.61
8 - 9.15

Hope that tells you something.

 

[Mike McLane]

Just realized that I should have posted this issue in the TROUBLE SHOOTING thread. I'll repost this reply there and please respond in kind.

 

[HamishR]

Your voltages told me it was in the voltage splitters. Look at R13.

 

[Mike McLane]

Not only did I look at R13, I replaced R13 . It was 4.7K instead of 47K. Works like a charm now. Thx!!!