Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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Marshall mg50dfx was working great

This was working great now no sound but lights and fan still work footswitch still changes channel

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Please check the speaker leads in the back near the edge of the driver (the heavy metal part I think theres 2 in that cabinet )

Posted on May 18, 2009

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I have a Marshall mg100hdfx Head & Cab - The clean channel is on but when i hit the footswitch it is not changing to overdrive channel - please help


Sounds like either your "front-panel" switches are not set for channel switching or the footswitch's mechanical "Channel" switch is defective. According to the OM the "Channel Select Switch" on the front becomes inactive with the footswitch plugged in.

If disconnecting the footswitch causes this front-panel switch to operate properly then it has to be your mechanical switch in the footswitch. Repair of these footswitches are pretty simple provided you find a replacement and have soldering abilities.

Oct 25, 2012 | Music

1 Answer

When I plug my P803 2 Way footswitch into my Haze40 amp the effects light flashes and the footswitch will not change channels or effects.


The P803 is designed to work with the "Valvestate" and Tube amps. I don't think it is compatible with the Haze40 since they have an optional 4 button footswitch so the optional one would necessitate different interface than the P803.

Jun 02, 2011 | Marshall Amplification Marshall P803 2-Way...

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My clean channel wont turn on. Light just stays red on distortion.


Insufficent information !!! Are you controlling this by the footswitch or the onboard switch? If the onboard switch and you HAVE at some point used the footswitch, likely the contact on the footswitch jack has failed that transfers control to the internal switch. If you haven't tried the footswitch see if that has control. I can send you the link to the schematics if you know how to read them. Here they are:

http://elektrotanya.com/marshall_mg250dfx.pdf/download.html

Scroll down to the little link that says "Get Manual" and click on it to download.

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

1 Answer

The problem that i have is a lighting hit my house, didn't have my amp plugged in to a surge. The amp works still but I cant switch it to my clean ch anymore.


Surge protector would NOT have protected it so don't kick yourself. If you had your footswitch plugged into the amp, the surge may have ruptured components in the circuit. Most likely are components on page 2 of the schematic in the upper left corner associated with the channel selection, C77 and TR1 would be first suspects. Deeper into the circuit is the channel switch chip IC9.

A voltmeter test of the FS_B input from the footswitch to verify that with the footswitch disconnected that this approaches 5 volts is first step. If it doesn't then the three components mentioned should be tested in the order I mentioned them. If it does go to nearly 5 volts, then IC9 is likely the culprit... it is a DG212 analog switch chip. It is readily available from DigiKey.com and others... in several different type packages. If yours is surface mount, you need to find someone with the proper tools to change the chip.

Here is link to schematic: http://elektrotanya.com/marshall_mg50dfx_sch.pdf/download.html

Jan 25, 2011 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

Hello, I have a Marshall MG50DFX and the fan is making a lot of noise. I saw a post from crispy_tophe and I'm looking for info. on where can I get the fan and what is the procedure to remove/replace it?...


Best thing is to open the unit and extract the fan and find the EXACT model number fan online and replace it. There are only two wires to solder., but mechanically these can be a mess to get to.

Sep 08, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

When I turn the amp on it makes a loud squealing noise. If I turn it on and off again (several times) the amp will work normal. It doesn't do this all the time; but it is beginning to happen often. When it...


Have a look at this link:http://www.geofex.com/ampdbug/squeal.htm then Back to the Home Page. You may have a bad solder joint some place on the circuit board also. Unless you have experience with electronic repairs you are best served by consulting an accredited Marshall dealer and repair person as there are voltages present that can kill or injure you.

Aug 22, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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It will not switch out of overdrive channel,


Check your footswitch if you are using that to switch.

There are a lot of possibilities to cause this so check external ones first. Cable and connector to the switch can be a problem as well as the switch itself.

The next step gets into the bowels of the amp and if you are not comfortable with electronic troubleshooting and repair you will probably need to take it to a shop..

Mar 29, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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...

1 Answer

My 100hdfx has a problem switching channels. Both overdrive channels work fine but the clean channel is none existant. If you switch it to the clean channel and turn it up all the way you can faintly here...


have you tried the footswitch to change channels. also. my amp has to be in channel 2 position (with the button on the head) before i can use the footswitch. sometimes the input/footswitch jack wears out and you need to bend the internal tip/ring tabs of the jack to make better contact. also like on my fender amp, i had just a standard mono instrument cable going to my footswitch and it was acting wierd cause it needed a stereo instrument cable. one last thing on the grounding resistors on the pcb, they get hot and break the solder welds which messes with all sorts of stuff in amps. usually look like sugar cubes , cement resistor. 5watt usually under 1k ohm. check for bad solder welds on the pcb where the big resistors are and the switches/buttons and at the footswitch. there may be a bad ic or transistor for the channel swithing

Dec 30, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

I have a Marshall MG50DFX. It's about 2 years old. I took it out on a gig and it quit working. The fan still works, but no sound. This amp is practically brand new. I am very diassappointed with the...


Hi a couple of years back I had a similar problem. Remove the chassis, you will see a wire (might be blue) it is quite noticeable (looks like a jumper a few inches long). It controls channel switching. Check it for dry solder or broken at either end. Good luck, Dereeldeel

Jan 16, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

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