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Marshall MG250dfx problem

Hi there, I have a marshall MG250dfx combo amp and it stopped making any sound in the clean channel. I have normal distortion on channel 2 and nothing else seems to have been affected. stomp the footswitch back to clean and nothing comes out. Any thoughts? One colleage suggested the preamp. If so, what does it look like so I can try to fix it. thx.

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Did you already open the amp? Can you send me a closeup picture of the PCB?
Is there any relay? I wonder how the signal is switched between the two pre-amp channels: Either there is a relay (I think so) or the signal is switched directly via the switch on the front. I dont expect optocouplers or switching directly in your footswitch.
So check relay and switch with a circuit / continuity checker

Posted on Nov 28, 2013

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Posted on Jan 02, 2017

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SOURCE: i have a marshall mg250dfx amp & have just got a

According to the Marshall site, the PEDL-90008 is not compatible with your amp. Only the 2-way foot controller that came with the MG250DFX is compatible with it; that foot controller is the PEDL-90004. See http://www.marshallamps.com/product.asp?productCode=MG250DFX&pageType=SPECS . If you need to replace the foot controller, it appears to be available at several vendors. Musician's friend is one online store with it in stock, http://www.musiciansfriend.com/amplifiers-effects/marshall-footswitch-for-mgdfx-amps .

The PEDL-90008 is compatible with amps in the MGFX line listed here: http://www.marshallamps.com/product.asp?productId=174 . The second column is for the PEDL-90008.

I wish that I had better news for you.

Cindy Wells

Posted on Aug 30, 2013

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I've had my Marshall MG250DFX for around 7yrs now at it has been gigged regularly throughout that time. It's been reliable up until recently. I'm now finding that getting volume on the clean...


Well without testing a bunch of parts. I would say some component in the clean preamp has changed. It may have happened over time and now you are noticeing it. without checking all the parts it would be hard to tell. Get it to a service center. Or you may send it in to Pro Line Music
215-736-8055

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

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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.

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Join this forum:http://www.marshallforum.com/marshall-amps/2682-marshall-avt-50xt-tribute-owners-please.html

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1 Answer

Hey, the clean channel on my Marshall 250dfx Combo amp isnt working the distortion and everything is working as normal, but the clean channel makes no sound at all, i was wondering if you can help?


The switching is done electronically by an analog gate chip. On IC9, check if the signal on pin 8 changes with switching between clean and OD... This is the actual signal that changes the gate. If you don't see a change there of say 5 volts, then the problem is in the circuits that drive this gate. If the signal is there, then the problem is in the clean channel audio op amps or the components around them. Let me know the results of the test.

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if this a tube amp then your tubes might be going bad. but if it is a solid state amp then im not to sure whats going on.

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Marshall MG250dfx's sound fades out


I have read that the problem is in the FX send/return jacks which oxidize if not used much. All you have to do, apparently, is ram a jack plug in and out a bunch of times. This breaks up the oxidation, and allows the amp to work properly again.

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It sounds like the speaker output jack is broken or it has come unsoldered from the circuit board. You can fix this if you have enough electronics experience but you have to be very careful as components in an amp can carry a lethal charge even after being unplugged. You can partially discharge the capacitors by unplugging your amp from the power source with the speaker plugged into the working jack and set at a low volume while turned on ( not on standby ). If you feel at all uncomfortable attempting the repair yourself you are far better off taking it to a repair shop preferably one with experience with Marshalls. The same is true for other brands as well. Please let me know if this helps.

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Yes, one of the power amps has probably failed. If the channels are seperate, then another possibility is a bad input connector. These do get broken when cables are tripped over.

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This sounds like a thermal problem. You can often find the component by spraying suspected ones with circuit cooler, looking for a change.

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