Help fixing a BD-2

[adicm]

Hi everybody.  I recently bought a boss BD-2 after seen in a page tht is good to get a Dave Guilmour Sound.  I bought it used and I have no the chance to test it before.  When I receive the pedal, I conect it, and, surprice! it doesn't works.  I have a reduction on the signal level and none of the "warm and smooth sound" that I think this thing has.  I open the pedal and  found that a diode is burnt.  I'm talkingt about the D2 Diode.  I'm not very skilled in electrinics (altough I'm not a complete newbie)  so I want to know if somebody know what this diode do and if I can fix my pedal just replacing it. here is the schematic, just in case: http://www.generalguitargadgets.com/boss/BossBD-2.gif
The D2 diode is in the lower left corner, where the ac adaptor jack is.  Is the first one, just below a +9v label and the ground.  

Thank you for your help.  I really want to fix this effect...

Adi

[MartyMart]

Hi,  D2 is the "reverse polarity protection diode"  and it looks like someone plugged this into the wrong power supply !
Boss pedals are "centre negative - "
Just remove and replace with a 1N4002/ 1N4004 / 1N4006 power diode
THey are black with a silver stripe.
Orient this the same as the one you remove and you should have a working pedal.
I hope that no other components were damaged, this is the job of that diode  

Regards,
Marty.

[adicm]

Hi,  I change the diode and a cap this weekend, but the pedal still doesn't works.  I Still have a reducction in the signal level, and the pots seems to do nothing when I turn them.

THis happens only when I turn on the effect.  When I have it in By Pass, the signal is Ok, but I'm not able to get the BD-2 Working.

Does anybody have an idea of what can be wrong , or where should I start to see in order to find the problem?

Thanks for your help!

[dosmun]

Build yourself and Audio Probe and start at the input and see where you are losing your sound at.

For more info go to the Homepage here and click on the Audio Probe/Debugging link.