Question about Marshall MG100HDFX 100-Watt Amplifier Head

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My marshall mg100 combo took a spill now the front of the input jack came off and the jack itself fell back inside the amp. I don't want to just start unscrewing stuff. whats the proper procedure to get inside the amp without harming it

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  • Marshall Master
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Yep! These poor quality jacks become "unriveted" and break in half. This is a fairly common occurence. Don't be afraid to unscrew stuff. USUALLY the corner protector screws are NOT necessary to take out. OFTEN the screws for the handle need to come out and any other screws from the top and the sides in the vicinity of the amp portion need to come out. Just keep track of where they go. The jack MAY be a part of the circuit board and you will need to get an exact replacement. NOTE: If it is mounted on the circuit board do NOT overtighten the panel nut as that can "de-rivet" the brand new jack !!! They are really poorly made...

Posted on Apr 06, 2011

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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...

1 Answer

How do I correctly connect my mg100hdfx head to a marshall stereo cabinet? Do I connect cables from both outputs from my amp to both inputs in my cabinet?


the second jack is usually for a second cabinet.



http://www.marshallamps.com/downloads/files/MG100%20hbk%20Eng.pdf



here's a link to the manual. to be sure.

if it has effects on it, you may require two cabinets for the stereo effects. in the truest sense of stereo is what i mean.

Feb 27, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

My input jack's nut has came loose and it fell into the amp. HELP


Open the unit and restore the jack to the proper place. Do NOT overtighten the input jack mounting nut.

Feb 01, 2011 | Marshall Amplification Marshall MG15 15...

1 Answer

Hi There, i have a Marshall MG100 DFX Series Guitar Combo Amp,and when i plug my guitar in i get verry little,or no sound from the guitar imput,can you please help. Thank you.


Try exceriszing the connections for input and headphone jacks ( just be inserting qtr inch connector in/out of jack ) a few times. then plug back into your input. if that didn't solve anything while amp is on move the input jack around ( up, down, left, right, ) and see if this makes the signal cut in/out to normal playing. if so you just have broken solder connections on the jack. Also you may just want to test your Speaker to make sure no problems exise there. ( Voltmeter across + and - terminals ) prolly 8 ohms but will most likely state on woofer. if not of this fixes your problem let me know and i'll throw some more steps your way.

Jan 24, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Okay i need to know how to get inside my amp to tighten up my input jack cause i cant play at all on my amp cause i cant get inside it i took off all the screws in the back and trying to get it off is a...


One can overtighten the input jack and "un-rivet" the jack. They are not made very well !!! OFTEN when they appear loose, they HAVE un-riveted the threaded sleeve from the metal inside the jack... that USUALLY requires REPLACEMENT of the jack itself.

The cabinet backs on a lot of these have to be PRIED out as the Tolex covering often makes them tight.

The amp portion is often retained by screws from the top and or sides AND even the two holding the handle on... there are many different configurations. Sometimes the amp comes out the front, sometimes the back. It is easy to shear off the speaker wires when removing some of them.

Dec 18, 2010 | Marshall 15 Watt Guitar Amp

1 Answer

Hi. I've had this transistor Marshall head for about a year now but lately whenever I plug a patch cord in the input jack and turn the amp on, I get crazy amount of distortion. I know this only a problem...


A educated guess points to either broken soldering or a broken ground on the input jack itself. This is a CHRONIC problem of amps because people trip over the cord and it yanks the cable and jack sideways breaking it or the solder where it attaches to the circuitry.

To avoid the problem, loop your cable through the handle of the amp so when cable is yanked it doesn't yank the jack so hard.

Nov 16, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

2 Answers

Can i fix one ampli marshall mg100 i had used my bass, and now my marshall have a very estrange noise


Well i know ive destroyed a guitar amp with a bass guitar before :-p this is why they make bass amps and guitar amps instead of just amps

Sep 25, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

I have a 30th special edition,,1962,,1992 marshall amp and want to know how to set up,,has jack plug in back,,not sure where it goes,,??


Well if there is anything you need to insert into the effects loop IE, wah pedals, noise gates etc etc the return is the output of the effect and the send would go to the input of the effect. As far as inputs those are all on the front panel.

Jan 08, 2010 | Marshall Amplification Marshall MG250DFX...

2 Answers

The input jack on my Marshall MG100FX has fallen into the amp case......how do you access the case to retrieve


I just had this problem and wasn't able to find the solution on line, so, here 'tis.

Take off the six screws on top of the amp cabinet. Unplug the speaker plug from the amp jack.The metal amplifer box can now be pushed out of the back of the cabinet and the input jack remounted. I had to force the box a bit as it was glued in just enough to tack it into place. (I was afraid to force the electronics box out so I took the entire cabinet apart piece by piece until I could see there was nothing left holding it in.) I found that prying it this way and that with a butter knife helped crack the glue.

Dec 16, 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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