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Europower pmp5000 no amp sound when cold start

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  • Europower pmp5000 no amp sound when cold start

    Hi i have behringer pmp 5000 and i have this problem.
    when i power on for first time ,the mixer starts normally but the amplifier not working. After 5 - 10 minutes the amplifier start working. Then if i power off and on again ,then amplifier starts after 3-10 seconds and working fine. The voltage on the amplifier is the same all time. So i think that the problem is on my amplifier. Can you suggest any solution? Thank you!!!! Sorry for my bad English.
    Last edited by stelioskoz; 11-13-2020, 03:11 PM.

  • #2
    So finally i manage to fix the problem. That was capacitor c66 2,2 μf 50V on the amplifier. Now the mixer and the amplifier starts normally

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    • #3
      Congrats for finding that.
      Attached Files
      Last edited by Jazz P Bass; 11-17-2020, 04:54 AM.

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      • #4
        Originally posted by Jazz P Bass View Post
        Congrats for finding that.
        Thank you jazz p bass!!!! I measured the voltage on c66 it was 4v and every second it goes up and up and after minutes the voltage was 8 v. Then the amplifier started. So i changed the capacitor and the problem fixed.

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        • #5
          So that resulted in the output of IC 6 comparator staying low.

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          • #6
            Jazz P Bass Yes i think this circuit is for safety. If the amplifier is very hot then the thermistor R1 change the resistance and the ic 6 cut the amplifier
            Last edited by stelioskoz; 11-18-2020, 09:15 AM.

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            • #7
              R1 seems to be a thermistor but certainly not a varicap (= variable capacitor).
              - Own Opinions Only -

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              • #8
                Originally posted by Helmholtz View Post
                R1 seems to be a thermistor but certainly not a varicap (= variable capacitor).
                Yes. sorry it was my mistake!!

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