Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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Marshall mg100fx broken pot

Master volume potentiometer replacement

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Posted on Jan 02, 2017

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SOURCE: The input jack on my Marshall MG100FX has fallen

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.

Posted on Jan 19, 2010

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1 Answer

Master volume is scratchy on MG100FX


All i can suggest is to use electrical contact cleaner on it from the inside. But you,ve already done that. And i would imagine that the master volumes will be the same to, Harry

Dec 28, 2013 | Marshall Music

1 Answer

How to replace a potentiometer


Disconnect from the mains.
Unscrew the four screws in the top
Slide out the chassis
Remove the knobs
Unscrew the pot nuts
Unclip/unscrew the PCB
Unsolder the pot
Solder in new one.
Re-assemble in reverse order
Strongly suggest you youse a better quality pot
Also the treble pot tends to go on these, replace at same time
All the best, Chris

Apr 14, 2013 | Marshall MG15DFX 15 Watt Compact 2...

1 Answer

My mg 100fx has a scratchy pot in the master volume, i have the face pate out and have sprayed the master very carefully. the problem is still there?


What did you spray it with? I hope NOT Deoxit or Blue shower as those wreck the pots by removing the lube.

Use CRC226 available in the electrical dept at Home Depot. Use the plastic tube by bending it so it can spray upward into the slot where the leads that solder into the board go into the metal can.

Spray a little in and work the pot... then try a little more and see if it improves the situation. If it does, treat all the pots the same. ALSO look for broken solder where the pot wires solder to the circuit board..

Mar 15, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

The treble knob for the clean channel broke off and now my clean channel doesn't work at all


Chaances are the potentiometer element was fatally damaged by the force when the knob was broken off.

You will need to have the unit serviced and getting the correct part is important to match the shaft, mounting, etc as well as the electrical characteristics.

The clean treble control is a 20K ohm, "B" taper pot (audio). ALL the signal for the clean channel goes through this so if pot is destroyed, clean channel will be dead.

Best thing is to call Marshall "parts" and get exact replacement. Note that sometimes the circuit board is cracked as a result of these accidents. This unit looks like the controls are VERY vulnerable to damage. I would make a cover to prevent damage from handling.

Another thing is to ALWAYS loop your guitar cable through the handle so tripping over it won't break the input jack which is a COMMON occurence.

Feb 07, 2011 | Marshall Amplification Marshall MG250DFX...

1 Answer

I got he Marshall MG100FX amp with 2x 12inch speakers. The potmeter of the master volume doesn't work anymore. Do you know the specifications of this potmeter? Armin, delta.design@usa.net


That should be a 320K pot. <br /> <br /> Here's a link to the schematic. <br /> <a href="http://www.ampix.org/albums/userpics/10003/MArshall_MG100DFX.pdf">http://www.ampix.org/albums/userpics/10003/MArshall_MG100DFX.pdf</a> <br />

Aug 26, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Master volume crackels from left to right


The master control has one of two problems:

1. It is noisy. Get some CRC226 in the electrical dept of Home Depot and open unit and spray a small amount into the control through the back side where the leads go into the pot. You may need to bend the spout of the CRC226 can to get it into the slot. Turn the pot back and forth to distribute the product on the resistance element inside.

2. The solder of the leads of the control has broken. Resolder these leads.

Aug 07, 2010 | Marshall Amplification Marshall MG250DFX...

1 Answer

Hi I have a marshall haze15w amp and stack, the problem seems to


There are many models of Marshal amps icluding 15Watt types.

First thing to try is to see if headphones have normal volume. If they do, then the headphone jack switch that connects the speaker is LIKELY bad.

If the headphones do not have any volume, LIKELY causes are:

1. Fried output power amp

2. Volume pot is broken or has bad solder joints to the circuit board.

Jul 10, 2010 | Marshall 15 Watt Guitar Amp

2 Answers

Marshall MG50 DFX, the volume knob OD channel crackles


Either the control is damaged (happens if they get hit) or it is possible the circuit board it is mounted on has broken solder OR worse, a crack near the control. The unit will require servicing. Parts are readily available.

Jan 28, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

2 Answers

Problem of marshall g80rcd, volume drop when i play


It sounds like your volume control is dirty. You will have to disassemble the amp enough to get access to the volume potentiometer which is soldered to the circuit board. There will be a square hole in it that you can spray some contact cleaner into the control. Use only contact cleaner as anything else could damage the control. Use a small squirt and rotate the shaft. If this doesn't solve the problem you may have to replace the control. While you have it apart, examine the solder side to make sure all the solder joints are perfect especially those on the controls. A bad solder joint can also cause the same problem. Before you take the amp apart unplug the power with the amp on and the volumes turned down. This will discharge the capacitors so it will be safe to work on. I hope this helps.

Oct 31, 2009 | Marshall Mg15dfx 15-Watt Combo Guitar...

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