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Problem with my RCF ART315A Powered Speaker

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    #1

    Problem with my RCF ART315A Powered Speaker

    Hello Everyone,

    My name is Johnny. I'm new to the world of electronic and have been reading the threads on badcaps and have learned alot and for that I thank you. So I have an RCF ART315A powered speaker and everytime I power it up the main fuse blows. Any idea what it could be?

    Johnny
    Tags: None
    #2
    Re: Problem with my RCF ART315A Powered Speaker

    Your most likely suspects are the bridge rectifier and/or power mosfet being shorted.
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      #3
      Re: Problem with my RCF ART315A Powered Speaker

      Pardon my ignorance but can you tell me how to identify and test them?

      Comment

        #4
        Re: Problem with my RCF ART315A Powered Speaker

        Post clear focused top down view pictures of the boards following my sig file below exactly.
        --- begin sig file ---

        If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

        We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

        Please do not post inline and offsite as they slow down the loading of pages.

        --- end sig file ---

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          #5
          Re: Problem with my RCF ART315A Powered Speaker

          Here you go.
          Attached Files

          Comment

            #6
            Re: Problem with my RCF ART315A Powered Speaker

            Quick Update:

            I tested the BR3 & BR4 which I assume are Bridge Rectifier 3 & 4. I saw a youtube video which showed how to test a br. I tested in circuit. I set the meter for diode test and took my negative lead from the meter to the positive on the br and positive lead to either ac leg and they both read in the 500 range. Then I did the opposite positive lead from meter to negative on the br and negative from meter to the ac on br and both read in the 500 range. This was the result for both BR's. Does this mean that the br's are good?

            Johnny

            Comment

              #7
              Re: Problem with my RCF ART315A Powered Speaker

              The diode readings you're getting are consistent with a good diode but I would also do the opposite, measure with positive probe meter on positive BR pin and negative probe lead on either (both) AC output, then negative probe lead on negative BR pin and positive probe lead on either (both) AC outputs. In all 4 cases the meter should read something like "OL" indicating an open circuit, not 0V or another number.

              Where is the fuse that is blowing? Is it at the input to the power supply section of the circuit (right after the power entrance to the speaker), or is it one o fthe two I see in the toe top middle of the picture?

              If it's one of those two, they look like output protection fuses so check the transistors right next to them in the circuit (connected by the traces).

              Also, the picture isn't very good, if my advice doesn't resolve this we might benefit from better picture(s). How many channels of audio output does this have? Just one, just two for two speakers, just two for a woofer and tweater (or other speaker driver combo), three, or even more?
              Last edited by 999999999; 04-27-2012, 02:45 PM.

              Comment

                #8
                Re: Problem with my RCF ART315A Powered Speaker

                Did this test in circuit with a dmm "measure with positive probe meter on positive BR pin and negative probe lead on either (both) AC output," and got the following results;

                First BR
                Everything reads OL

                Second BR

                DMM positive lead to Positive BR, DMM negative to first ac pin and it starts at .1 and rapidly goes to 1.24 and than slowly goes up but never read OL .

                DMM positive lead to Positive BR, DMM negative to second ac pin and it starts at .1 and rapidly goes to 1.248 and than slowly goes up but never read OL.

                DMM negative lead to negative BR, DMM positive to first ac pin and it starts at .1 and rapidly goes to 1.248 and than slowly goes up but never read OL.

                DMM negative lead to negative BR, DMM positive to second ac pin and it starts at .1 and rapidly goes to 1.248 and than slowly goes up but never read OL.

                Does this mean that the second BR is bad? Can I test BR's in circuit with accuracy?

                The fuse that keeps blowing is the one by the ac plug. I did a continunity test on the 2 fuses in the picture and they are fine.

                This is a 2 way box. Has a woofer and a tweeter.

                Comment

                  #9
                  Re: Problem with my RCF ART315A Powered Speaker

                  It would have helped a lot if we had a schematic or at least a better picture to see this portion of the circuit.

                  Off the board, these measurements would indicate the BR is bad, but on the board there could be another component interaction like a bleed resistor across the DC power rails. You might want to measure resistance across the DC power rails (BR positive and negative pins is one place to do that). If a resistance is present elsewhere that may account for the readings. If you can find no resistor or other component completing the circuit, THEN I would pull the BR off the board and measure again.

                  Your decimal points seem odd, previously you had measured or wrote 500 but that should have been 0.500 (Vf).

                  Comment

                    #10
                    Re: Problem with my RCF ART315A Powered Speaker

                    Different people have different methods. I use resistance tests in circuit first to see if a bridge rectifier is bad or not. So I number the pins 1, 2, 3, and 4 and measure the between 1-2, 1-3, 1-4, 2-3, 2-4, and 3-4. Any resistance reading less than 30 ohms suggests a short and warrants desoldering and verification out of circuit.
                    --- begin sig file ---

                    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                    Please do not post inline and offsite as they slow down the loading of pages.

                    --- end sig file ---

                    Comment

                      #11
                      Re: Problem with my RCF ART315A Powered Speaker

                      I don't have a schematic for it. I searched the net but couldn't find one. I'll try and take better pictures tomorrow. Should I remove one of the BR from circuit and try to measure? Any other steps you'd like me to try until I post better pictures?

                      Comment

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