what kind of diode is this?

Skywalker83 · 10th January 2009, 06:54 PM

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.

Conrad Hoffman · 10th January 2009, 07:21 PM

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.

coloradosound · 10th January 2009, 07:37 PM

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.

Skywalker83 · 10th January 2009, 07:44 PM

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.

jwb · 10th January 2009, 08:02 PM

It looks like a zener to me.

Skywalker83 · 10th January 2009, 08:04 PM

All the zeners i have seen have a black ring round them.

coloradosound · 10th January 2009, 08:05 PM

Yes, jwb, I didn't think of that quick enough!

10th January 2009, 06:54 PM	#1
Skywalker83 diyAudio Member Join Date: Nov 2008	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.

10th January 2009, 07:21 PM	#2
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	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. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

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10th January 2009, 07:37 PM	#3
coloradosound diyAudio Member Join Date: Nov 2005 Location: colorado	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.

10th January 2009, 07:44 PM	#4
Skywalker83 diyAudio Member Join Date: Nov 2008	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.

10th January 2009, 08:02 PM	#5
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	It looks like a zener to me.

10th January 2009, 08:04 PM	#6
Skywalker83 diyAudio Member Join Date: Nov 2008	All the zeners i have seen have a black ring round them.

10th January 2009, 08:05 PM	#7
coloradosound diyAudio Member Join Date: Nov 2005 Location: colorado	Yes, jwb, I didn't think of that quick enough!

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