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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Fri Aug 14, 2009 9:59 am Post subject: resistor identification question |
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I've been running into these quite a bit lately. They are blue in color and list their value right on the body. The question is, what does the letter that follows the value mean? For instance, the two over heated ones I'm looking at are 39K followed by what looks like a J. They are about 1/2 inch long and about 1/8th dia.
Thanks,
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Chip
A Barco is only a AmPro with training wheels
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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RogueChili
Joined: 31 Mar 2008
Posts: 162
Location: Westfield, MA
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| Posted: Fri Aug 14, 2009 11:45 am Post subject: |
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the letter defines the tolerance; J = +- 5%
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Tom.W
Joined: 09 Mar 2006
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Nashou66
Joined: 12 Jan 2007
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Location: West Seneca NY
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Aug 15, 2009 1:43 pm Post subject: |
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Yep, those are the ones. They do test OK.
Now, same device different component to test. It's a diode with a funky number 2EZ5.1 Quick search comes up empty.
I'm still looking so I can test it. The control it came from is a Amtrol Boiler-mate smart control. Essentially a digital thermostat. They all seem to fail with the same symptoms and that is power related.
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Chip
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Aug 15, 2009 2:06 pm Post subject: |
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Thats a 5.1 volt zener.
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Aug 15, 2009 2:56 pm Post subject: |
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| macgyver655 wrote: | | Thats a 5.1 volt zener. |
I figured that was what it was with the "Z" in the part number. How do I test it.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Aug 15, 2009 5:19 pm Post subject: |
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DMM on diode test. Should show some resistance in one direction and no flow in the other direction.
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