Question about Mackie SRM-450 System

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When I power on the speaker. The red thermal light, red peak light and the green signal light all light up and stay lit up even though there is no signal going to the speaker and even if there is NO SOUND! I would love to get some feedback! because I am a tad handy with electronics. Cheers and Thanks in advance Rocky

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Posted on Jan 02, 2017

turinband
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SOURCE: mackie 450 thermal light on no sound

could you give some more info? what are your running into your speaker? and how exactly is it run? once we weed out common issues like switched up cables, than we can move on to internals.
which on that note, I think this is a manufacturing defect


here's a link to the schematic if you want to go poking around the circuits.....


http://www.mediafire.com/?myion3zkxn3


or
http://www.mediafire.com/file/myion3zkxn3/Mackie-SRM450 actspk.pdf



take a resistance test between D56 pin1 and Q35 pin2. thats where this issue seems to be stemming from from ones ive worked on. I have know it to be an internal track that was broken and needed to be glued back down. definitely not the first time ive seen this....

Posted on Dec 08, 2012

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