Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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Wiring diagram marshall mg100fdx footswitch - Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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Using a standard 1/4 inch stereo plug....Ground (sleeve) to tip for one switch and ground to ring for the other.

Posted on Nov 02, 2012

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SOURCE: The digital FX on my

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

cpt_cavman
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SOURCE: 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 )

Posted on May 18, 2009

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1 Answer

Bought amp with no footswitch


The schematic shows it as a standard 1/4 inch stereo plug. Wire the ground common to both switches (Channel and DFX), the ring to one switch and the tip to the other...I.E. ground (sleeve) to ring for one switch and ground to tip for the other. You'll have to experiment with which switch operates what function and label them accordingly.

Nov 02, 2012 | Marshall MG100HDFX 100-Watt Amplifier Head

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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

On the MG30FX, it wont stay in overdrive sometimes. I push the switch in, then it will go back to clean automatically.


There is a possibilty that switch contacts on the footswitch jack are dirty if you are NOT using the footswitch. If you ARE using the footswitch, then an intermittent cable or static charge build up may be causing this.

Aug 06, 2011 | Marshall Amplification Marshall MG30FX

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

My clean channel wont turn on. Light just stays red on distortion.


Insufficent information !!! Are you controlling this by the footswitch or the onboard switch? If the onboard switch and you HAVE at some point used the footswitch, likely the contact on the footswitch jack has failed that transfers control to the internal switch. If you haven't tried the footswitch see if that has control. I can send you the link to the schematics if you know how to read them. Here they are:

http://elektrotanya.com/marshall_mg250dfx.pdf/download.html

Scroll down to the little link that says "Get Manual" and click on it to download.

Apr 15, 2011 | Marshall Amplification Marshall MG250DFX...

2 Answers

I have a Marshall channel/dfx footswitch. The jack plug has been chopped off leaving me with a red, blue and yellow wire. Can you tell me where each one is soldered to on a replacement stereo jack plug?...


NEVER trust colors... with an ohmmeter you can tell which is the common lead by testing... find the lead that has continuity to EITHER switch independently... It is PROBABLY the blue one... this will be the "sleeve" of the plug. The schematic documentation is so bad the jack wiring cannot be decipered as to which contact is the tip and the ring. HOWEVER once you find the common of the switches and connect it to the sleeve you have only two choices for the other wires so just try them.

You can also take the back off the pedal to find which color goes to BOTH the switches... connect that one to the sleeve. Try the other two wires for proper operation before final soldering.

Apr 11, 2011 | Marshall Amplification Marshall Footswitch...

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...

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