Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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How do I replace a fuse on a Marshall DFX 100, where is it located?

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The fuse would be internal. The fuse blew for a reason, and unless you had an accident with the amp such as shorting a speaker lead, there is likely internal damage requiring servicing. Replacing the fuse without curing the original reason it blew will likely cause damage to further components.

Take the unit in for repair.

Posted on Sep 06, 2010

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If you're asking if the foot pedal goes between the guitar and the amp or straight in to the amp then it's the latter.

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Marshall AVT 100 dfx doesn;t work


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I need to replace the fuse for a used Marshall MG100HDFX that I bought. Where is the fuse located inside the head?


If the fuse is blown make sure the reason it blew is repaired before replacing the fuse. Start the amp up after replacing it with a 100 Watt light bulb in series with the hot side of the power into the unit. This will act as a current limiter to verify it is repaired and will not blow the fuse. When you open the unit the fuse will be obvious... Follow the hot side of the power cord, through the switch to the fuse.

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Manual for a marshall mg100 dfx


Here's a link:http://www.marshallamps.com/downloads/files/MG50_250%20hbk%20Eng.pdf Although not exact should be close enough.

Nov 11, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

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Ihave a marshell dfx 100 guitar amp...as i play it the volume lowers and will eventully fade to nothing... any ideas..


For a test in troubleshooting, see if level from the headphone jack fades or not when this happens and get back to us.

Sep 02, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

The digital FX on my Marshall AVT100 amp do not work, regardless of the footswitch. What do you think the problem is?


This is likely to be an internal problem. Check the +5 volt power to the DFX board as a first step.

Jul 28, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

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...

2 Answers

Marshall MG100 DFX manual


If you just bought it new, Marshall will replace any parts, or the store you got it from. If its second-hand I would have a look on ebay for parts.
The user guide can be found here...
http://www.marshallamps.com/product.asp?productCode=MG100DFX&pageType=DOWNLOADS

Good luck, its a sweet little amp!!!

Feb 13, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

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