Peavey Digital Reverb

[Billy R aka DynaFreak]

Cool, thanks, I think I get it now. The Peavey service info says U1 is an "8K x 8 bit EEPROM with spring reverb alg" . I assume "alg" is short for algorithm. So the answer to my question is that the EEPROM is programmed with instructions that are sent to the CS4811 at power-up that tell it to be a reverb. Interestingly enough, the EEPROM has "SPR VRB" stenciled on the top. I assume if the EEPROM was switched out with one that had instructions for a different effect, for example a delay, then my little PCB would now be a delay (as suggested by Enzo).

Thanks to everyone that posted.

[Billy R aka DynaFreak]

As I was tossing the board into the "used parts" bin, I felt something give ever so slightly under my finger pressure. Close inspection under magnification revealed that one of the SMD electrolytic caps had a broken solder joint. I fixed it and re-installed the board. Problem solved!

[tedmich]

yay! its (almost) always the caps!

[Jazz P Bass]

As I was tossing the board into the "used parts" bin, I felt something give ever so slightly under my finger pressure. Close inspection under magnification revealed that one of the SMD electrolytic caps had a broken solder joint. I fixed it and re-installed the board. Problem solved!

Awesome find.
Surface mount E caps are stupid.
About as lame as SM headers.

[Billy R aka DynaFreak]

I believe the root of the problem was that there were 2 e-caps right next to each other on the board. During manufacturing something bumped, and one was a little off target. The pads did not line up with the leads on the cap and the tenuous solder joint passed initial inspection at the factory but failed later due to vibration.

[tedmich]

Made in Mississippi? Or China?

[Enzo]

Those boards are made on a machine in either place. Pick and place, reflow solder.