what is this diode?

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  • bluto
    Badcaps Veteran
    • Oct 2007
    • 560
    #1

    what is this diode?

    I think it is a zener? The lettering on it is as follows: ZC 332F. It is shorted in both directions.

    It came out of an Emerson EWC1302 tv/vcr combo. My dad uses it at work and dropped it slightly when moving it. The tube is ok and everything on the board looks good, no cracks etc. But the set will not power on, only whine when plugged in. I started probing around looking for shorts and bad caps. I found one cap that showed a short, the diode next to it showed a short also. I removed each individually and checked for shorts, none were apparent so I put them back in. I then probed around until I found this guy that was a apparently causing the short. I took it out and verified that it was shorted. The components mentioned above no longer show a short. So I looks like this may be the culprit. Could jostling it it cause a failure if it was borderline to begin with?

    Also, I am not sure if this is a problem but the main IC(marked K2662) in the power supply section shows continuity from the right side pin to the tab/heatsink.
    Tags: None
    • bluto
      Badcaps Veteran
      • Oct 2007
      • 560
      #2
      Re: what is this diode?

      Well I think I almost answered my own question. It looks like a 33 volt zener. I dug up some usenet postings on this set and found some more info. Next problems is that it looks like the HOT is shorted also. It is a TT2138. Does anyone know if there is a a compatible IC still available?

        Comment

        • Krankshaft
          Badcaps Legend
          • Jan 2007
          • 2328
          • USA
          #3
          Re: what is this diode?

          It crosses to an NTE2640 but only use universal replacements as a last resort when the original part number can't be found.

          Newark, Mouser, and MCM have the NTE part in stock.

          Here's the NTE datasheet:

          https://cdn.badcaps-static.com/pdfs/...cf11322f47.pdf

          In this case I did have a look and it seems like due to the availability of the original universal is the only option. Ironically enough B&D Electronics didn't have the original part in stock recommended a replacement and that part was also out of stock. That alone leads me to believe your chances of finding this part through regular channels is slim.

          The few rare times I've used NTE HOTs due to availability problems they have functioned just fine so go that route.

          Also next time you need to cross a part go to this page:

          http://nte01.nteinc.com/nte/NTExRefS...earch?OpenForm
          Last edited by Krankshaft; 10-06-2010, 01:51 AM.
          Elements of the past and the future combining to make something not quite as good as either.

            Comment

            • bluto
              Badcaps Veteran
              • Oct 2007
              • 560
              #4
              Re: what is this diode?

              Thanks for the info. I ordered the parts from mouser.

                Comment

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