Posted by kenster (A) on June 28, 2009 at 18:09:14

Opened the unit and nothing is visually fried/blown. All PCB traces are solid.
This is the Rev D version of the UO and 5 of the 6 Transient voltage suppression diode's measure as shorted. D3 Transient voltage suppression diode measures open which indicates it's still good as compared to a new 1.5KE36CA Transient voltage suppression diode.

Question is can 5 of the 6 Transient voltage suppression diode's, which are connected in series with D3 in the middle, be internally fried and one survive?

Thanks in advance,

Ken

Edits: 06/28/09

• RE: 15A High Current UO blowing fuses after hard transient hit. - PaulMC 05:18:14 06/29/09 (3)
  In Reply to: RE: 15A High Current UO blowing fuses after hard transient hit. posted by kenster on June 28, 2009 at 18:09:14

  If the Tranzorbers die it's usually a direct short which is what it sounds like. You should send it back for repair.
  

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  • RE: 15A High Current UO blowing fuses after hard transient hit. - kenster 07:50:53 06/29/09 (2)
    In Reply to: RE: 15A High Current UO blowing fuses after hard transient hit. posted by PaulMC on June 29, 2009 at 05:18:14

    Thanks Paul. I've already purchased 6 1.5KE36CA TVSD's and will replace
    them all and go from there.
    
    I just found it odd that 5 of the 6 TVSD's were shorted with D3, which is in the middle of the series connected components, still good but I've seen stranger things in electronics.
    
    Thanks again,
    
    ~kenster
    
    
    

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    • RE: 15A High Current UO blowing fuses after hard transient hit. - PaulMC 09:29:04 06/29/09 (1)
      In Reply to: RE: 15A High Current UO blowing fuses after hard transient hit. posted by kenster on June 29, 2009 at 07:50:53

      Nice. Well done!
      

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      • RE: 15A High Current UO blowing fuses after hard transient hit. - kenster 11:57:02 06/29/09 (0)
        In Reply to: RE: 15A High Current UO blowing fuses after hard transient hit. posted by PaulMC on June 29, 2009 at 09:29:04

        Replaced all 6 TVSD's and we are back in business.
        
        Cheers,
        
        ~kenster
        

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