Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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I have a marshall mg 100dfx amp the problem is i cant seem to work out how to work the switches to go from one channel to anothercan i get hold of a instructional manual thanks alan

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Posted on Jan 02, 2017

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SOURCE: hi i am john... i have a 100dfx mg series... it is

There are MANY more likely components than the transformer that will cause the fuse to blow.

Most common are filter capacitors, rectifier diodes, and shorted components in the power amp section.

Transformer failure is very UN-likely. Have a competent electronic tech troubleshoot the unit.

When testing the unit, put a 150 watt light bulb in series with the power line... saves fuses during troubleshooting. This limits the current so one can analyze the real cause of the problem.

Posted on Jul 13, 2010

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SOURCE: Marshall Mg 100DFX power on no sound it just cut

If you put in headphones in the amp headphone output, and there's a sound, it's probably the output amp (IC1 - TDA7293V) that's bad from the fan failure, if not cooled proberly failure is doomed to happen. Replace fan and output part, and you should have an amp up and running again.

Posted on Nov 17, 2011

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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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How to fix an output jack for a marshall mg 100 fx. Came loose and is inside the amp


You have to remove the amp from the case. These jacks are JUNK and it likely will have to be replaced. In any event, the amp has to come out to work on it. Several screws in the case and OFTEN the screws holding the handle. Be careful of the speaker leads.

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Marshall Mg 100DFX power on no sound it just cut out last time i played it.The fan has issues I wonder if there is a cooling sensor shutting down the amp output.I thought solid state amps were bullet...


Something has probably failed or become a bad joint. If you turn up the gains and volume to max is there any hiss or hum from the speaker? If not there will be a problem in the power amp or power supply. Check fuses at back. The speaker may be open circuit too, that is easy to check with a multimeter. If you can't get far yourself, you'll need a repairman.

Solid state amps are not that reliable these days, there are so many things that can fail due to all the effects that people demand to be built in. Look at how many people are reporting problems with ss amps here.

Apr 02, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Hi i have the Marshall MG15FXMSDM Dave Mustaine Megastack and i also have the programmable footswitch. the other day, i was plugged into a big surge protector and the footswitch was working fine. i...


First thing is to verify the MAIN power source is getting to the amp. It may not be the fault of the footswitch at all. Connectors and cables are the usual cause of these problems. Seating of connectors is a common problem...

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1 Answer

Hi i am john... i have a 100dfx mg series... it is


There are MANY more likely components than the transformer that will cause the fuse to blow.

Most common are filter capacitors, rectifier diodes, and shorted components in the power amp section.

Transformer failure is very UN-likely. Have a competent electronic tech troubleshoot the unit.

When testing the unit, put a 150 watt light bulb in series with the power line... saves fuses during troubleshooting. This limits the current so one can analyze the real cause of the problem.

Jul 12, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

I was playing my Marshal 100DFX for about half an hour and when I was done it smelled like burnt electronics. Then I noticed the fan wasn't working. It usually turns on right when I turn the power on. I...


Replace the fan with an IDENTICAL part. Do this before using the unit again.

There is a possibility that the fan is controlled by temperature and the failure is actually with that electronics rather than the fan itself.

May 19, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

4 Answers

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

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