what kind of diode is this?

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What is it from? It appears to be a small signal diode.
I agree with Conrad. If you can get schematic or service manual
with parts list it will help in positive i.d., but as Conrad mentions
unsolder one side and lift up to where it's not in contact with
the trace anymore and re-measure. If it functions correctly then
time to look elsewhere but it may be shorted if still reading same
both ways.
 
It's from a ZOOM B2 bass guitar multieffects pedal.

Basically what happened was, im in Europe, i bought the pedal from America on Ebay. It came with an adapter (designed for american 110v) , my friend didnt know this and plugged it in using a travel adapter (american to europe plug) , and well, basically the pedal doesnt work now!!

I've spent most of the past 2 days going over it with a multimeter and to be honest i cant find any major faults with the components. All i can think that has happened is that the microchip/s on the board have got scrambled when the wrong adapter was used.

With it being what it is, its impossible to get the schematics for it.
 
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