Question about Mackie SWA1801 Subwoofer

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Mackie SWA1801 NO POWER, NOT TURNING ON

I have the schematic from Mackie and it shows that i am supposed to have 18V at the rectifier D40. I noticed that at the transformer (Coil) I am only getting 5V from the secondary. It is a dual winding coil and the other winding has an output of 22V which feeds another rectifier D1. I also noticed that at the start-up board where the coil plugs into, there is a relay involved that does not energize. According to the diagram, 18V is required at the coil of the relay to energize. Does the relay energize when 18V is received from rectifier D40 or does the relay have to be energized before anything happens...can anyone help???

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  • dj georgie Oct 11, 2009

    hello can you please send me schematics circuit., G_man001@hotmail.com

  • mianibma268
    mianibma268 Apr 05, 2012

    hello i can help you can send copy of schamatics circuit i my email. is mianibma22@live.com tanks .

  • ixbt
    ixbt Apr 21, 2012

    Please help! i have blown capacitor, on this sub, please send me schematic to kurkul@gmail.com thanks!

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Help please looking for a schematic for my sub ,as it's blown both fuses ,suspect further damage mackie 1801
email to justthinkofaname@hotmail.com (thanks). regards Rich.

Posted on Apr 11, 2011

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  1. I have blown capacitor in my mackie swa1801, Can you send me schematic g_man001@hotmail.com thanks Georgie.

Posted on Aug 16, 2009

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My transistor tip 122 is crossed and my fuse 1 is blown out. i need a diagram of mackie swa1801.

Posted on Mar 05, 2012

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Hi, I have no power on my Mackie swa1801 Can you zend me that schematic please? De_Wijns@hotmail.com THX Thomas

Posted on Oct 30, 2011

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I have one with a different problem, Get me a me a circuit diagram and I will tell you in 5 min what your problem is.

Posted on Nov 18, 2010

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Please help, can you send me schematic djglutto@wp.pl
thanks

Posted on May 13, 2010

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Please help, can you send me schematic Pankaj_65@hotmail.com

thanks Pankaj.

Posted on Jan 07, 2010

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Check The 20 watt 22 ohm risistor on the ac input board

Posted on Jul 11, 2009

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Hey,

Can I get a copy of that schematic?? I am also troubleshooting the same problem. I have found in two other occasions that the large power resistor has blown along with the poweramp. They are supposed to blow OPEN but in the case of the two i have worked on they burn to a high resistance. I only had 5 VAC going to primary of the large toroidal input coil. Maybe your problem maybe not. I have also needed to replace transistors TIP122, MJE15033 and MJE15033 and 2sc5200's(both) on the outputs.

-Brian C. Miller
metallifornia@hotmail.com

Posted on Oct 29, 2008

  • metal81 Nov 20, 2008

    Add these resistors to the fix for the Mackie swa1801
    r6 100 ohm
    r8 1 ohm
    r56 1 ohm
    r57 100 ohm

    The 1 ohm resistors (brown, black, gold, gold) damage was hidden to the eye but using a DMM you will see that they are burned open. I removed them from the PCB and found that they were burned on the underside.


    -Brian C. Miller


×

I think you will find that the relay is energised by the primary AC, which then passes the secondary outputs to the amplifier section. This is to protect the circuits in the event of the input supply falling below required level, which would otherwise result in wrong current loading and component failure.

Posted on Jun 10, 2008

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