Question about Marshall MG100HDFX 100-Watt Amplifier Head

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

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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.

Posted on May 24, 2011

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Posted on Jan 02, 2017

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Low volume on my marshall


I am very new here and don't know how to answer a question to a specific problem so I will write about the most common problems that I have had over the decades doing guitar amp repairs. If you find that your amp is extremely low in volume and then suddenly comes back to normal- check out the effects return [or power amp in] jack. Especially in Marshall amps-these corrode and your signal dies. If there is loud noise such as hissing and crackling with no guitar patch cord in the input jack- the input jack is likely at fault. They normally have switching contacts that ground part of the input circuit when the 1/4 inch male plug is disconnected. When this in is corroded or too weak to make normal contact, you can get these symptoms. If your amp is a solid state Marshall or Fender and there is a random buzzing sound with no guitar signal connected- hit the side of the amp and listen for the buzz to go away or become louder-if it does, this usually means that the connections are loose at the two large filter capacitors. In one or more Marshall amps, they use a filter circuit in the low voltage power supple for the preamp tubes. If you encounter a dead Marshall[the model escapes me now] remove the circuit board and resolder the four connections at the bottom of the bridge rectifier. If you have any other amplifier repair questions you can email me direct at computerlen@hotmail.com.

Nov 14, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

2 Answers

I have 2 marshall mg100hdfx heads, i want to run them together, how do i wire them?


You have to use seperate speakers for each. These are not designed for any form of "bridged" operation.
You would have to wye the inouts from your source.

Jan 08, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

I was given a Marshall MG Series 15 DXF guitar amp. The input jack has been twisted off and broken out of the circuit board. I would like a diagram of this part of the circuit. OR Is this soldered to...


Typically these input jacks have 3 or 4 "tails" that solder to the circuit board. The best thing is to get an exact matching jack. You can search for 1/4 inch jacks with matching profile at Digikey.com, Mouser.com, and try www.tubesandmore.com/

In the future ALWAYS loop the guitar cord through the handle so plug is not yanked sideways when people trip over the cord.

Dec 14, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Can i connect 2 jbl 300 watt speakers to the mg 100hdfx 100 watt amp head ?


Yes you can as long as the speaker impedance when paralleled doesn't go below the rating of the amp. Marshall seems to hide their design lowest output impedance. Possibly you can find that in your owner's manual. Then find the impedance of the JBL. If half the JBL impedance is equal to or greater than the lowest impedance the Marshall is rated, you are fine to use it. The speaker Watt rating should always be bigger than the amp rating which it is in this case.

Dec 11, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Hiwhat is the best way to connect my DigiTech RP10 to my Marshall MA100H Guitar Amplifier


Read your manuals for both pieces of gear carefully first. You only have one amp so you won't be able to take advantage of all the FX on the Digitech as a lot of them are designed for stereo. The Digitech manual shows guitar into the Digitech and output from the Digitech into input of any guitar amp. Since you have a Marshall and can already get some great sounds by running your guitar straight into the Marshalls input, you would probably be better off using your Digitech in the FX loop. Run a guitar cord out of the send on the loop into the input of the Digitech and a guitar cord out of the left / mono output jack on the Digitech into the effects return jack on the Marshall. Start out with the effects level on the Marshall all the way down. Do the same with the Digitech with both the input and output levels. (Read the manual carefully) I think the choice of the Digitech isn't that great because it is already trying to reproduce a lot of what you can already get with just your Marshall but with a little experimentation and some careful adjustments you should be able to add to the sound of the Marshall. Hope this helps.

Oct 23, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

2 Answers

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...

2 Answers

Marshall Lead 100 Mosfet head, no sound.


are you popping fuses??? check the effects, preamp, and power amp jacks to make sure they (even if not in use) are Normally Closed. Sometimes they loose their contact to ground on the Tip of the jack, which opens the circuit and interrupts the normal function. then check the input jack for good contact to the pcb and solder joints, as well as all pots (especially the volume). if all this checks out, and it still is having issues, i would then move on to the grounding resistors (solder welds can heat up and break as these resistors get hot) and resolder them to the board. still no output, then diodes / rectifier / filter caps.

May 01, 2010 | Marshall Amplification Marshall MG250DFX...

4 Answers

Marshall MG50 DFX amp line out/headphones not working


Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.

Mar 07, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

My mg 100 hdfx halfstack was playing at half volume then lost its volume


Have the output transistors checked. That can be a source of failure. This is something you can do yourself if you have electronics experience. If you take it to a tech they should be able to pinpoint the problem by troubleshooting the amp.

Dec 14, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

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