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Old 10th January 2009, 07:54 PM   #1
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Default what kind of diode is this?

And how do i know what its value is?

It doesnt appear to have any markings or code stamped on it.

I also suspect that it is popped, as when i measured it with a multi meter (set to the diode test function), i got a reading 0.6 in one direction and 0.7 in the other.

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Old 10th January 2009, 08:21 PM   #2
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No way to tell without a schematic. If you get .7 or so in both directions on the diode check setting, it's probably fine. That just means it's in parallel with some other junction. To be absolutely sure, lift one end and measure it again. Usually a diode will fail shorted both ways. Unless it doesn't.
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Old 10th January 2009, 08:37 PM   #3
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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.
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Old 10th January 2009, 08:44 PM   #4
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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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Old 10th January 2009, 09:02 PM   #5
jwb is offline jwb  United States
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It looks like a zener to me.
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Old 10th January 2009, 09:04 PM   #6
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All the zeners i have seen have a black ring round them.
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Old 10th January 2009, 09:05 PM   #7
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Yes, jwb, I didn't think of that quick enough!
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