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Thread: Behringer B205D no noise

  1. #1
    Twobie
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    Behringer B205D no noise

    Hallo,

    i'm from Germany and my english is not so good. Please excuse me.

    I have a Behringer B205D that makes no noise when it is switched on. The powerlight is on, the phantomlight can switched on. The schematic i have downloaded.
    The +15 and -15V and the 48V are ok. I can touch the Preamp-Board where i want, no noise is comming out. It is like the Box is switched off.
    During my searches suddenly it was working, then again not.

    Who can help me please?

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  2. #2
    Twobie
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    I have made some more Tests directly at the IC's of the Pre-Amp. At all of them the +15 and -15V and also the 48V are available. Then i took a amplified PC-Speeker an plugged it to the Thru-Plug. That is working. Music was comming out of the PC-Speaker. So the Pre-Amp is ok.
    But there is no noise from the b205d-Speaker. The PWR-Amp is not working.

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  3. #3
    Twobie
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    Something strange!
    After the measurements i assembled the pre-amp and build it in. Then i tested again the pass-thru. It was working. Then i plugged in a mikrofon and suddenly the B205D-Box was working on all inputs. Then i increased the main-volume. At a high level suddenly the pwr-amp was switching off.
    Is there a overload protection?

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  4. #4
    Twobie
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    Heureka, i found the problem
    It was so banal!!!
    A bad contakt at the loudspeaker!!!

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  5. #5
    Old Timer J M Fahey's Avatar
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    Glad you solved it

    Please upload the schematic here to help others in the future.
    Thanks.

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    Juan Manuel Fahey

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