Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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Mg 50dx no sound

Where can i find a schematic for this amp. or part no. 104k63

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Contact Marshall on the web or try a search for exactly what you need, most companies will help you with there products no matter how old they are .

Posted on Mar 19, 2009


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Marshall MG100HDFX footswitch toggling - bypassing?

I once used uART & some latches to decode & hold the difference between "odd & even" midi program changes. Then used the output to switch a relay in a twin necked guitar to change between necks as it were in response to a midi pedal. Perhaps you could do something similar? Else get a Studiomaster MA-36 midi analyser & hack into it to use one piece of midi data (from across an LED?) to switch channels on your amp? Good Luck!

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Marshall mg 50 dfx amp sounds muffled?

Turn off the effects or go inside and unplug the little sound card. It is only a few samples of real effects, not the real thing. It's like a cheap PC sound card separate from the other components and has a small power plug on it. Wiggle that plug or unplug to see if it changes. It won't cut her sound, just the effects. Make sure the effects are off and verify, if using a footswitch, that it is working properly.

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I have the old 3520 200w SS head. It is blowing the fuse as soon as I power up. No one around here (south of Dallas, TX) know anything about this amp. I am using the Marshall 1553 cab w/ one 15"...

Here is a link to your schematic:

Scroll way down and click on "Get Manual" link. They will only let you download two a day unless you are registered.

Suggestion is to troubleshoot and repair the unit.

You will likely find one of the following:

Shorted transistors in output TR5 through TR10

Shorted rectifier diode(s)

Shorted fillter capacitor

Shorted power transformer (not very likely)

Mar 21, 2011 | Marshall Amplification Marshall Mg Series...

1 Answer

I need the schematics for a Marshall MG-10KK guitar amplifier in order to repair it! I'm a good technician but I don't speak english very well... rsrs Thanks!

Most of the problems with the small guitar amps are blown power amp chips. They usually use chips like the TDA2030 which look like a power transistor.
Most other problems involve broken connectors, bad solder joints or cracked circuit boards. The power supply area is so simple one doesn't need a schematic for that part which is usually just three terminal regulators for +/-15 volts. Schematics are often hard to find.
Try this site, although this is a different model, much of the schematic will likely be the same.

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I need the schematics for a Marshall MG30DFX guitar amplifier in order to repair it.

If you still want the schematics for the Marshall MG30DFX Steve I have them and can email them to you if you want

Dec 10, 2009 | Marshall Music

1 Answer

Hi,I turned on my Marshall mg series 100 dfx and there is no sound,just static comes on.Its starts with a kinda bad feedback sound than turns to loud static.

I suspect the power supply for the effects processor has failed. The effects unit will "go crazy" when power supply is too low voltage.

If the amp has loud noise, then the power amp portion is PROBABLY OK.

I had a similar problem in a Behringer amp caused by a bad electrolytic filter cap.

Aug 11, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

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