Question about Pioneer SX-315

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Protection circuit activated.

Hi- We've had a series of power surges, power is fixed now, but My Pioneer SX-315 will come on for three seconds, then turn itself off. My manual says that is because the protection circuit is activated, and says : recovery Method- press the STANDBY key twice. I've tried pressing the standby button on the amp, and also on the remote, I've pressed it twice while the amp is in standby, pressed it twice within the three seconds the amp is on, tried pressing and holding, but so far no luck. Any recommendations? Thanks! I am in Mexico, so a service tech might be hard to find.

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  • mel150 Nov 08, 2008

    I'm a former sound technician, so I can do some simple tests with a meter, and if I can find a soldering iron here, I can solder. :) If not, if you can tell me what to do maybe I can get a Mexican tech to do it. Appreciate the help!

  • mel150 Nov 09, 2008

    Ok- am I testing for 40 V AC at the speaker terminals?

  • mel150 Nov 09, 2008

    No voltage at the speaker terminals. I am not sure how to check for the short. My manual says,
    7.1.1 Troubleshooting

    The protection circuit is activated by DC or overcurrent detection.

    Detection method: The voltage at the protection port (Pin 7) of the microcomputer becomes low.

    Time required for detection: 2.5 seconds after the power is turned on.

    Operation when the protection circuit is active:
    -Mute: ON
    -Speaker Relay: OFF
    -The unit immediately enters standby mode

    Recovery Method: Press the StandBy key twice.

  • mel150 Nov 09, 2008

    Ok, thanks for your helap, I think maybe that's a little too technical for me to fix. :) But your comments have been very clear and helpful, thanks!



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I can tell you what you will have to do , if you can unsolder and solder components then i can help you fix the problem. but if you cannot do some electronic tests or procedures then it is going to be hard for you and me to get this problem fixed
but if you can then please give a fixya rating so that i can further assist you, any other rating than fixya hurts our score , so for me to continue to help you will have to give this rating , sorry but this is fixyas doing , you can always change it if you are dissatified with my help , thanks


Posted on Nov 08, 2008

  • 4 more comments 
  • jason Nov 08, 2008

    ok , the you would need to test the power circuit to the power amp and make sure that it is not comming out will the unit is plugged in but not turned on, also remove any speakers that are hooked up to the unit and test to see if power shoots out when the power is turned on( like 40v ) then that would for surely say that the power amp is gone but also looking for a short somewhere would be the where the problem is , and that always happens in the power amp

    let me know what you get from some test so i can further analyze the problem, thanks


  • jason Nov 09, 2008

    yes , if there is voltage just comming out then the power amp for sure needs to be replaced

    but if not it still can be the problem

    so also check for a short on the power amp without power to the unit

    let me know what you have found so far

  • jason Nov 09, 2008

    and if you do find that kind of voltage at the speaker terminals then your speakers may be damaged or blown( hopefully that did not happen) also check the fuses to the power amp to see if they are blown , that would also indicate that the power amps are blown

  • jason Nov 09, 2008

    this could be a bad capacitor or the protection circuit has bad components and the over current can be from the power amp or a short( continuity , full connection , no resistance)

  • jason Nov 09, 2008

    if there is dc power flowing thru , then there is a bad capacitor( electrolytic)

    looks like these

  • jason Nov 09, 2008

    you can check the capacitors this way , no power and unplugged , test each capacitor for an open connection , that will tell you that the capacitor has dried out and become an open , which would identify the problem

    hope that helps some more




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