Repairing a Boss DS-2 (schem included)

[yertle]

Hi guys,

I accidently killed my DS-2 while I was modding it. I wasn't carefull enough while I was trying different diode's and caps which made the PCB touch the enclosure while the pedal was on. The bypass still works (so the buffer and power supply should be ok) but there's no sound when I click the pedal on, the LED goes on so I'll gues the switching section is fine too. There aren't any burned components and all the caps look fine, I also tested al diode's with a DMM and they all seem fine. I have zero experience with repairing commercial pedal's and I have no idea where to start. My main suspect are the transistors but it will be a pain in the ass too replace em all and I'm not even sure if that will help  . Anyone with some experience with these pedals and knows where to go from here?

Thanks in advance

Here's the schematic: Link

[miqbal]

See debugging page 1st...

[PerroGrande]

If a visual inspection doesn't reveal anything (which it probably won't due to the low voltages and currents involved), the next step is to test for the various voltages that are used in the circuit.  Specifically, look for the 8V supply produced by the emitter of Q7 and the 4V supply from a voltage divider that follows.  If you don't have these, the rest is chaos.

[miqbal]

I think audio probing is good method. I have repaired 2 of my non working pedal (Boss HM-2, I got this one from junk market, and Boss MT-2, I build this one). As long as we understood where the signal flows, you should easily fing where the troublemaker are.

Audio probing is simple, just desolder the cable that connected to your output jack from the board, and start touching the signal line with the open end of the wire.

If this does not work, then you could go for semiconductor testing since caps and resistor are rare to be found broken.

[yertle]

Thanks for the reply's guys, but I already fixed the DS-2 using an audio-probe (great tool by the way ) It was just a wire going to the volume pot which didn't make good contact I really thought something in the powersupply was broken because wen the pcb touched the enclosure the pedal went off, so I thought I shorted something (which I probaly did but it didn't do any damage). I felt a bit stupid when I found the wire that caused the problems but I definitely learned alot while trying to fix this pedal