HELP: Faulty DD-3

[siaoguitar]

hi guys, got a faulty DD-3, it happened when i plugged a negative pin through it's dc jack, now there's still LED light, but just no delay effect, and turning the effect level knob has no effect...

Anyone knows what can i do to repair? Someone mentioned a change of diode would bring this pedal back...

Please help.

Thanks
Ken

[sfr]

Good info here:

http://www.diystompboxes.com/smfforum/index.php?topic=55003.0

[Dirk_Hendrik]

Which version of the DD are we talking about? The older one wit a chip about as wide as the case or the newer one with a similar chip in SMD package and only one memory chip (an it's own PCB).

As for something to start with:
Check if the power supply reverse diode is damaged.
and, since the LED still lights, check if the 78L05 voltage regulator (looks like a transistor) has 9 volts input and 5 volts output.

[siaoguitar]

Which version of the DD are we talking about? The older one wit a chip about as wide as the case or the newer one with a similar chip in SMD package and only one memory chip (an it's own PCB).

As for something to start with:
Check if the power supply reverse diode is damaged.
and, since the LED still lights, check if the 78L05 voltage regulator (looks like a transistor) has 9 volts input and 5 volts output.

Hi Dirk, it's the new ones with smt components...git to locate this v. regulator...which is it?