Question about Marshall MG100HDFX 100-Watt Amplifier Head

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My mg100dfx has almost no sound comin out of it

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Don't replaced anything until you jumper the power amp in jack to the preamp out jack [or effects send jack to the effects return jack]. There may only be oxidation in the contacts of these jacks. If the normal sound level comes back-either clean the two jacks or have them replaced.

Posted on Nov 23, 2014

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Posted on Jan 02, 2017

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SOURCE: my mg100dfx has almost no sound comin out of it

It could be in the power supply, open the unit up and find the power supply. Look to see if there are any caps that are bulging on top. If they are, they need to be replaced. Look to see if any components are burnt or look like they have got hot. If you know how to use a meter check the values of the resistors and any transistors that just does'nt look right. Check for bad solder joints. If a solder joint looks dull it may be suspect. Hope this is helpful. Ps: replace all components with the same value, this is if you understand a little about electronic.

Posted on Nov 02, 2009

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1 Answer

The clean wount work on this amp


It sounds like a bad IC to me. Also, it could be a bad solder connection at that channel's volume pot or the pot itself.

May 22, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

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I am look for a fuses for a Marshall amp like Mg100dfx


Radio Shack Has bus fuses. I don't work for them. The Shack is wack, but they have fuses

Dec 10, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

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I have a Marshall MG100DFX. I turned my amp on a few days ago and I heard this loud sound (not the standard hum/buzz that you hear when you plug a guitar into an amp; it sounded more like a foghorn). Now,...


I would try hitting the side of the amp before turning it on. There may be a loose piece of solder or other conductive particle stuck somewhere. Bang the cabinet rather hard with your fist. If that doesn't help it might be a loose solder connection at a resistor or capacitor but a tech should check that out.

Dec 04, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

When you turn it on its making buzzy sound even im not flug in


One, You may Have a bad 1/4" jack on the Input, or Two you may have unballenced Bias on the Output Tubes. This is a technical adjustment in the Amplifier.

Oct 09, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Marshall mg100dfx, internal fuse blowing every time you switch on the unit. What could be the problem


The way you troubleshoot this is to put a 150 watt lamp in series with the input power cord. The lamp acts as a resetable fuse and will limit the current while you look for the bad component. Start with the capacitors and rectifiers connected to the power transformer.

Sep 30, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

The RW5W in the R-15 spot on the circuit board of my marshall mg100dfx amp is loose and needs to be repaired. looks like i have to pretty much disconnect all front knobs and most wire connections, to pull...


Yes, they are a pain to have to remove the knobs etc. to get the board out.

If the resistor has burned or browned the board, resoldering may not be good enough as the traces to the pads and the pad MAY have unbonded from the board. In this case you may need to install eyelets to get adequate support for the resistor. The other method is to install "turret" terminals and attach the resistor to those... the turret terminals kind of rivet into the board to create a secure mechanical connection.

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

1 Answer

My mg100dfx has almost no sound comin out of it


It could be in the power supply, open the unit up and find the power supply. Look to see if there are any caps that are bulging on top. If they are, they need to be replaced. Look to see if any components are burnt or look like they have got hot. If you know how to use a meter check the values of the resistors and any transistors that just does'nt look right. Check for bad solder joints. If a solder joint looks dull it may be suspect. Hope this is helpful. Ps: replace all components with the same value, this is if you understand a little about electronic.

Jul 23, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

My mg100dfx gain knob spoiled.may i know the specs.for the knob pls


If you have the pot out look on the edge of the metal can for the code. Take it in to a good electronics supplier for a match. You will need the same audio taper also.

Jul 08, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Marshall MG100DFX noisy


Before you bring this into a shop, try spraying out all of the controls. Use an electronics switch cleaner that contains a lubricant. Spray into the control and work the control back and forth a number of times to loosen up any dirt inside. Then spray it again.

Let me know if that resolves the problem.

Thanks,
Dan

Feb 14, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

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