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My marshall jcm2000 dsl50 will not power itself the mains lead is fine and none of the fuses are blown but it wont power i have only had it four months why is it doing this.

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Check standby power supply,it stays on all the time main power is off and is subject to damage from transits from power company.Bad switch?

Posted on Sep 07, 2009

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The power amp section has blown parts. You will likely find they use a chip like the TDA7293 as the power amp output and it will be blown, shorted causing the fuse to blow. These cost $6 from Digikey.com. Find a competent tech to replace it and use heat sink compound. Verify the part before ordering one. They come with leads bent either way so make sure you get the one with a matching suffix letter. When firing up after repair, put a 60 watt light bulb in series with the hot power lead to act as a current limiter... saves blowing fuses if there is another problem.

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Have marshall mg100 hdfx head -power it up and blows fuses right away!


This is either a shorted component in the power supply section or in the power amp electronics itself. Continuing to replace a fuse MAY damage additional components. Take unit in for servicing.

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Blown fuse


Continued replacement of fuses without fixing the reason for them blowing MAY be doing additional damage to components in the unit.

It needs to go to a repair shop. It is likely there is damage in the power supply section or that of the power amplifier section.

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It is unlikely that your actions with the plug strip caused any permanent damage to your unit.

If you unit has a digital effects unit, probably the setting for that got disturbed and you need to reset it to your desired setting.

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Hi im in Argentina and i accidentally pluged in my amp without an adapter now it doesnt work what needs to be fixd?


The power supply is blown. Argentina is 220V I believe. I have never seen a power supply schematic for this however being that it is low power it is a linear supply not switching. Either the rectifier diodes are blown out or possibly the output capacitors are blow due to approx double voltage. If you try this yourself be careful otherwise get a new amp. Good Luck

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