Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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

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

Posted on Jul 28, 2010

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Posted on Jan 02, 2017

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I had this Amp for almost 4 years now, and suddenly got a problem a month ago. When I'm using it from clean sound it suddenly auto switch to distortion sound and vice - versa .


Normally that would be caused by a dirty footswitch jack or a broken (intermittant) cable on the footswitch itself. If neither of these is the problem, it will be a relay in the amp and will have to go in for service. Here's a link

http://www.marshallusa.com/service.asp

Oct 23, 2016 | Marshall Music

1 Answer

I have a Marshall mg100hdfx Head & Cab - The clean channel is on but when i hit the footswitch it is not changing to overdrive channel - please help


Sounds like either your "front-panel" switches are not set for channel switching or the footswitch's mechanical "Channel" switch is defective. According to the OM the "Channel Select Switch" on the front becomes inactive with the footswitch plugged in.

If disconnecting the footswitch causes this front-panel switch to operate properly then it has to be your mechanical switch in the footswitch. Repair of these footswitches are pretty simple provided you find a replacement and have soldering abilities.

Oct 25, 2012 | Music

1 Answer

MARSHALL FOOTSWITCH FOR DSL100 TROUBLES


Does your M foot switch work on the Fender? If you know how to use a multimeter you could check continuity by putting meter leads on plug of M foot switch(1 on tip, 1 on sleeve ) You should see a change in the multi meter when you depress switch. If so switch is good. Another easy test is with cap off a spare 1/4 plug -plug it in to foot switch jack.put a alligator or some such metal clip or wire and join(called short or shorting) the two inputs . If connecting and unconnecting results in switching then the foot switch is suspect. One fairly common thing is that foot switch and input jack are often sautered straight to a circuit board to save $ on production cost. Used to be all point to point where a wire was attached to 1/4" input and then wire went to circuit board or tubes. The wire has give, but not so with direct wiring to board. So the nut holding the 1/4" amp input gets loose(doesn't have to be loose for the following to happen) and a pull on the chord causes a break in the soldier and thus a break in the sound chain. Sometimes it will work intermittingly by putting a little pressure left, right, up or down on the plugged in plug. If so, it's the input jacks connection to the amp. If not it still could be that because putting pressure on plug may not be sufficient to affect a temporary reconnection. Since switch(the new one you made)works on Fender, but not Marshall I suspect the jack or foot switch circuitry past the input jack. If using some of the above the above tests leads you that direction,remove housing(unplug a/c power 1st ) inspect jack,wiggle it slightly see or feel a break then resodier from back side. You should be able to use the soldier already present without adding extra.

Sep 27, 2017 | Music

1 Answer

How to connect the foot switch.


Using the CORRECT footswitch for this model, you just plug it into the footswitch jack. You MUST use the correct one for the model.

Aug 05, 2011 | Marshall Amplification Marshall MG50FX 50...

1 Answer

When I plug my P803 2 Way footswitch into my Haze40 amp the effects light flashes and the footswitch will not change channels or effects.


The P803 is designed to work with the "Valvestate" and Tube amps. I don't think it is compatible with the Haze40 since they have an optional 4 button footswitch so the optional one would necessitate different interface than the P803.

Jun 02, 2011 | Marshall Amplification Marshall P803 2-Way...

1 Answer

On the Marshall 5 button footswitch for the TSL, there are 7 wires in the cable, 6 of which are clearly labeled by color on the circuit board in the footswitch. The brown must be combined with another wire...


Only 6 wires are used by the amp. Tie the brown wire to the metal frame to act as shielding if anything. You will probably find that the brown wire either connects to the shell of the connector or to nothing.

Apr 23, 2011 | Marshall Amplification Marshall 5-Button...

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...

Mar 02, 2011 | Marshall Amplification Marshall MG Series...

1 Answer

I seem to have the wrong cord on my footswitch as the female end on my amp is one of those computer types, How can i get around this?


The footswitch should be a 1/4 inch stereo type (TRS) plug to fit the footswitch jack of the MG250FX. It is a three wire connection.

Jan 06, 2011 | Marshall Amplification Marshall MG250DFX...

1 Answer

Marshall mg50dfx was working great


please check the speaker leads in the back near the edge of the driver (the heavy metal part I think theres 2 in that cabinet )

May 17, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

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