[sdiy] Need help understanding a schematic !

[Jean Bender]

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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