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Old 2nd June 2010, 09:27 PM   #1
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Default Please Help ID this... Diode?

This red device (diode?) has a burnt area all around it. I assume the cap is bad along with a burnt resistor.

Is this a zenier diode? I do not have a schematic, however the back side of the board has the diode symbol and a long "Z" or "N" in front of it. I copied the markings off of the back of the board- they are on the pix, because they are hard to see through the burn marks. (see pix).

If it is a diode, what size would I replace it with???



Any help would be appreciated.

_john
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Old 2nd June 2010, 09:38 PM   #2
Netlist is offline Netlist  Belgium
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Hard to tell. A zener is usually drawn like this
From the looks it reminds me of an old 1N4148.
Could you reverse engineer that small part of the circuit?
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Old 2nd June 2010, 11:10 PM   #3
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I just paid $5.00 for a junk schematic! Problem still not solved. Thanks for the input Netlist.
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Old 2nd June 2010, 11:19 PM   #4
mjf is offline mjf  Austria
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hello.
yes,looks like a (z)diode.........
have you tried to measure it (with a dmm)?
greets
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Old 2nd June 2010, 11:21 PM   #5
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It looks like it got quite hot. I don't know if it would work???

The amp doesn't work, so I'm assuming that it is the faulty part. I got a junk schematic, maybe I'll chance it and replace it w/ a zenier?
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Old 2nd June 2010, 11:39 PM   #6
mjf is offline mjf  Austria
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z diodes often run hot a little bit in operation.........
can you measure the voltage drop of this part?
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Old 2nd June 2010, 11:43 PM   #7
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Yup,

I get .665 one way and open the other way. Holy diodes batman! I guess that it is working. The resistor near it is shot and maybe the cap is bad, the cause of the strife.

I'm a parts changer, not a wiz.

-John
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Old 2nd June 2010, 11:58 PM   #8
mjf is offline mjf  Austria
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.........yes,looks like it is not burnt' through...........
btw cannot translate 'holy diodes batman' ?
greets
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Old 3rd June 2010, 12:03 AM   #9
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YouTube - Holy, Holy, Holy - Batman
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Old 3rd June 2010, 12:11 AM   #10
mjf is offline mjf  Austria
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..........yes......sometimes we have here "holy arnold (schwarzenegger)" but doesn't help in electronics..............
good night.....1 am.............
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