[sdiy] Need help understanding a schematic !

Barry Klein barryklein at cox.net
Sat Dec 11 01:44:01 CET 2021

First verify your supply voltages. Then start at the pitch pot. Vary it and look with scope from there along the processor chip path. Analog switches and cmos parts die over time and are what you can replace so check if they seem to work and cross them off on your schematic.  

Sent from my iPhone

> On Dec 10, 2021, at 4:08 PM, Jean Bender via Synth-diy <synth-diy at synth-diy.org> wrote:
> Hi !
> I have to repair a boss sps-10. The unit works when used in delay mod, but nothing when used as pitch shifter.
> But i also discovered that the tuner output is not working when the effect is on, in delay mod or pitch shifter one. The output is only working when the effect is powered but not engaged.
> When i look at the scheme, i don"t get the way it's built, nor i can see where i could find a faulty part. I assume some transistor is not working and i'm looking for a voltage problem, but i'm a bit confused with the way some parts are wired together.
> Would someone here agree with explaining me how the different parts of this effect work together ?
> Actually i know how to troublecheck with my scope and multimeter, but i stuck on how are working the remote effect input and tuner output.
> Thanks for your help !
> Best
> J.
> here is a link to the schematics and service manual !
> http://www.univertron.com/SAS/manuals/Boss%20(Roland)/Boss%20RPS%2010/
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