Fw: [Premium-Rx] Cubic R3030 Help

[L D Ritta]

My Cubic receiver just triped the house circuit breaker due to the
caps C3 C4 C5 on the input filter without the reciver switched on, read 
320ohms and there were black scourch marks between the caps.
One of the caps has a hole burnt it's side.  BTW these are supposed 
to be 1KV but were only 600V.

Lee
  ----- Original Message ----- 
  From: FRANCIS CARCIA 
  To: L D Ritta 
  Sent: Wednesday, December 03, 2008 1:22 PM
  Subject: Re: Fw: [Premium-Rx] Cubic R3030 Help


        Here is an odd one. Every once in a while one of my 3030 power supplies makes a big spark sound and pop th efront panel breaker. I finally found the problem. There is a high voltage ceramic in front of the transformer.
        It is glued to the board with epoxy. The Epoxy broke down. Under the microscope the epoxy is all black from a clear to tan color. Also tiny cracks through it. The cap looks fine once I scraped the epoxy away. I didn't check the schematic but this cap may be  a snubber across the primary. Hope I didn't kill the supply. frank

        --- On Tue, 12/2/08, L D Ritta <ufp at optusnet.com.au> wrote:

          From: L D Ritta <ufp at optusnet.com.au>
          Subject: Fw: [Premium-Rx] Cubic R3030 Help
          To: premium-rx at mailman.qth.net
          Date: Tuesday, December 2, 2008, 11:48 AM



          ----- Original Message ----- 
          From: L D Ritta 
          To: carcia at sbcglobal.net 
          Sent: Wednesday, December 03, 2008 3:14 AM
          Subject: Re: [Premium-Rx] Cubic R3030 Help


          Thanks for that. Where do you recon I should start trouble shooting the Output Loop. My receiver is strange that where
          you select am or fm it uses .5khz filter even thou there is a 8kHz filter, and can select it using BW
          I had a look on murphys site could not find any cubic stuff, and he will not export anything even nonmilitary.
            ----- Original Message ----- 
            From: FRANCIS CARCIA 
            To: L D Ritta 
            Sent: Tuesday, December 02, 2008 11:20 AM
            Subject: Re: [Premium-Rx] Cubic R3030 Help


                  Check the bridge if the one on the DC side is blown. It usually takes a diode or two with it.
                  The bridge makes plus and minus 135 volts and the switcher primary side is referenced to   -135. Murphy has a 3030 power supply. frank

                  --- On Mon, 12/1/08, L D Ritta <ufp at optusnet.com.au> wrote:

                    From: L D Ritta <ufp at optusnet.com.au>
                    Subject: [Premium-Rx] Cubic R3030 Help
                    To: premium-rx at mailman.qth.net
                    Date: Monday, December 1, 2008, 6:32 AM


                    Hello Everyone

                    Well I managed to blow the side off a component in my power supply. I have have never used one these before.
                    There are two of them, one across the ac input the  other across dc side of the bridge rectifer. This CR12
                    right under switch S1 What is it? I need to replace it and I don't know what to order. Is this what they use in place of a fuse?
                    Why didn't they have a fuse?

                    73 Lee
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