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Transistors burn out on one side of driver board f-2580 at switch on of signal sansui au11000

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If it keeps burning out check the wiring section of the board that is powering the transistor.
A contact or a bad diode for example can cause the transistor to blow recurrently.

Posted on Aug 31, 2008

  • Ginko
    Ginko Aug 31, 2008

    Check with the multimeter if there are more faulty components on same area of pcb. check wirings to the unit, if it is a Amp final transistor a short on output wiring can burn it.
    Check if oxyde on the board or connector may cause a short, also inspect cold joints on board.


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How do I adjust the output bias current on a

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Connect your voltmeter`s probes on the "emitter" of the two output transistor, or in other words the measurement is made between the emitters of the output transistors.
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If only one side was repaired then you could use the good side and measure its biais as reference. Or
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Without seeing the amp nor having the service manual in front of me, it sounds like you have a severe offset problem. There is either an open resistor or transistor in the early stages. With the output transistors removed from the unit, look around at voltage levels to determine where the fault is. I will try to locate the service manual. Can you post the parts that you have replaced?


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