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Thread: M-Audio powered speaker turn on problem

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    M-Audio powered speaker turn on problem

    Have a pair of M-Audio GSR10 powered PA speakers. They refuse to turn on with power switch, but when I ramp them up on the variac they come on normally and work correctly. Any suggestions why?

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    It is really strange that two devices have the same fault.
    The easiest way is to turn on the device through the variac and to measure the voltages at several points at
    the input of the power source and inside. Then turn it on without variac and see what voltages have changed.
    Analyze and try to find the cause. It may take several attempts. The task is complicated by the fact that the
    type of the power source is SMPSU.

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    Lifetime Member Enzo's Avatar
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    Many SMPS have a soft start, like a low resistance with a shorting relay. Possible that using the variac fools the soft start circuit.

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    This SMPSU uses NTC, not shorting relay.

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    Lifetime Member Enzo's Avatar
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    NTC is another way to do it, yes, but I have rebuilt enough Behringer SMPS with a relay shunting resistors in that function. We don't seem to have a schematic here, so I believe you, but we are limited in the help we can supply.

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    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by Enzo View Post
    NTC is another way to do it, yes, but I have rebuilt enough Behringer SMPS with a relay shunting resistors in that function. We don't seem to have a schematic here, so I believe you, but we are limited in the help we can supply.
    A timing issue? variac bringing it up slowly?

    Check to see if there are any part numbers on the board sometimes we can find schematics based on those.

    nosaj

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    Click image for larger version. 

Name:	IMG_20190616_133918X.jpg 
Views:	4 
Size:	805.2 KB 
ID:	53998

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    I ordered new thermistors used for inrush current limiting hoping that will solve the problem
    Keep ya all posted

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    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by Bigdrums View Post
    Click image for larger version. 

Name:	IMG_20190616_133918X.jpg 
Views:	4 
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ID:	53998
    Does board look similar to this?

    https://www.fullcompass.com/prod/238...ply-pcb-for-k8
    nosaj

    If so maybe this will help
    http://bee.mif.pg.gda.pl/ciasteczkow...Schematics.pdf

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    I inserted the wrong pic, here are 2 of the M Audio board:

    Click image for larger version. 

Name:	IMG_20190616_135457X.jpg 
Views:	3 
Size:	1.32 MB 
ID:	54001Click image for larger version. 

Name:	IMG_20190616_135445X.jpg 
Views:	3 
Size:	1.64 MB 
ID:	54002

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