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AX9 Yamaha amp , no functions , schematic / advice please .

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    AX9 Yamaha amp , no functions , schematic / advice please .

    This one seems to power , as the RED LED for standby goes out , or on as the case may be & relay clicks over , but none of the LEDS for any of the inputs light .

    Suspecting a micro controller type issue on front board .


    Anyone worked on these units ?
    Attached Files

    #2
    Re: AX9 Yamaha amp , no functions , schematic / advice please .

    Led myself astray on this one .

    Turned out to be the primary side of main transformer O/C

    Thermal fuse had popped .

    Strapped a Wickman T2.5A across the original for now just to test amp , then will find something more appropriate to use

    Amp now working .
    Attached Files

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