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Mackie SRM 450 needs help

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Jorge Maradiaga
Jorge Maradiaga picture

i have an speaker mackie srm450

the problem is need a lot of signal for start to work i don't now why? i all ready checked all the input and routing an looks fine
tried to upload the schematic but i can not do

bluemoon picture


as first we need to know wich one you try to repair, SRM 450 or 450MkII. There is a hughe difference between them. First one is a classic construction but the second, MkII is a quit different because the power supply is SMPS and it is very bad and very hard to repair. If you need SM, you can finde it here, just type mackie srm. After you dowload the SM and measure signals and oscillograms we can talk about how can we help you.

Best regards