I have a CD player that is dead. I found a zener diode surface mount diode. The part number is UDZ27B. It is a very small part. I measured across it and it measured 3 ohms. I figured it could just be a part in parallel, so I removed it and tested it out of circuit. It still measures 3 ohms both ways. So does this mean I found the bad part. I have NEVER seen these fail before.
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Last edited by tech2014; 09-27-2014, 08:28 PM. -
Re: Surface Mount Diodes
Yes it's bad and diodes often do fail shorted. -
Re: Surface Mount Diodes
It's possible that it's bad.
Are you using the diode function on your DMM?
You should read low resistance in one direction and high resistance in the other direction, getting matching resistance in both direction would indicate that it is bad.
Are there other zener diodes like the one you found bad that you could do a reference measurement?Comment
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Re: Surface Mount Diodes
I measured a similar part and it measured normal (low one way, high the other)
I did use the diode test on my fluke.Comment
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Re: Surface Mount Diodes
Does anyone know where I can order these? Can't find them at mouser or digikey.Comment
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Re: Surface Mount Diodes
I believe this might be a suitable replacement.
http://www.digikey.com/product-detai...BCT-ND/2615748Comment
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Re: Surface Mount Diodes
Sorry I gave the wrong part number. The actual part number is 224492700R2, I gave the part description.Comment
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Re: Surface Mount Diodes
still the same,
It can either be UDZ27B or UDZS27B.Comment
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Re: Surface Mount Diodes
yes but the part I need is for -27vComment
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