20 Most Recent Marshall MG15DFX 15 Watt Compact 2 Channels 8 Speaker Practice Amp Questions & Answers

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

have you tried cleaning it

Possibly a loose connection, or bad solder connection. unplug it from power.

If you think you are up to it geta soldering iron and some solder, and a screwdriver, and take the amp part out. be careful of the speaker wires. put some tape on each one and label them so you know where to put them back. after you got it out you might have to take some more screws out to get the board off of the chasis, so you can see under it. this is where all the components are soldered to the board. maybe use a magnifying glass. touch up anything that looks questionable.
do all over. you don't need to know what everything does if you just go all over. careful not to cause any shorts. you might see something that obviously needs to be fixed. you have found a problem. you can't fix something if you don't find a problem. do all over anyway if you think you still have to.

Put it back well enough to test it. then put it all the way back together, or continue to look for a problem, or take it to someone, like me!


Good luck





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If you still want the schematics for the Marshall MG30DFX Steve I have them and can email them to you if you want

The fuse in a Marshall MG100DFX amplifier is located on the rear panel of the amplifier, near the power cord. To access the fuse, you will need to unplug the amplifier from the power source, and then locate the fuse holder, which is a small, cylindrical component with a cap that screws off. The fuse holder should be labeled with the appropriate fuse rating for your amplifier. Once you have located the fuse holder, you can unscrew the cap and remove the old fuse. You can then replace it with a new fuse of the same rating, and screw the cap back on securely. It's important to note that if your amplifier blows a fuse, it may be an indication of a more serious issue, such as a short circuit or a problem with the power supply. If you replace the fuse and the amplifier continues to blow fuses, it may be necessary to have it serviced by a professional technician.

More information required.

Why is there no sound when my wired headset is connected? To check that the headphones are connected correctly and there are no loose connections, try unplugging and replugging the audio device. Make sure that the headphones are not plugged into an audio-in or microphone jack if your audio equipment has more than one headphone jack accessible.

It's possible that your Marshall MG30 DFX amplifier is experiencing a hardware issue. The noise you're hearing when you turn it on and off could be caused by a malfunctioning component in the amp's power supply or switching circuit. Similarly, the intermittent operation of the channel switch could be caused by a problem with the switch itself or with the wiring that connects it to the rest of the amp. To troubleshoot these issues, you may want to try the following steps:

1. Make sure that all the cables and connections to your amp are secure and not damaged in any way. Loose or damaged cables can cause all sorts of problems, including noise and intermittent operation.
2. Check the fuse in your amp to make sure it's not blown. A blown fuse can cause the amp to make noise or to stop functioning entirely.
3. If the problem persists, you may want to consider taking your amp to a professional technician for repair. A trained technician will be able to diagnose and fix any hardware issues that may be causing the problems you're experiencing.

I hope this helps! Let me know if you have any other questions.

"Overdrive Channel: high frequency noise as the gain and volume are increased." This is the expected result, you are experiencing feedback. Try turning the "Contour" knob all the way to the left and turn down the tone knob on your guitar.

https://elektrotanya.com/marshall_mg-30dfx_sch.pdf/download.html

You said, the best and easiest way. Since a blown fuse indicates a short, your amp will blow as many fuses as you put in it, until you remove the short. If it appears that you blew fuses, the main amp would appear to be the cause of the short. The best and easiest way to solve the problem is to take it to the Marshall dealer or an electronics repair shop. In the future, do not connect or disconnect speakers with the power turned on, and don't connect more speakers than the manufacturer recommends. The AC input fuse is inside, very near the end of the AC cord. If the glass is discolored, the fuse link inside the little fuse exploded. If it went out that violently and you replace it without repairing the short, you will get to see it blow again. The reason the fuse is inside is because in the brief second that it takes for the fuse to go out additional damage can be done in the world of solid state electronics. That's since 1972,

On main circuit board, remove the chassis

you have an open on your speaker bridge circuit

1. probably a resistor or, capacitor check with a multimeter

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/%23SM_scena/Marshall/Marshall_jcm800-series-service-manual.pdf

Check for blown fuse

Power off the amplifier. Hold the AMP button while powering on. Once the screen for the reset process shows on the screen, firmly hold the STORE button to confirm factory reset until the screen shows "CONFIRMED"

Is is just the knob has broken (in which case, buy yourself a new knob and replace the one that's there) or is the potentiometer shaft broken too? That's a much bigger job, that involves pulling the whole amp apart and replacing the pot --- you need to get an electronics tech to do it. Google mg series knobs to find replacements --- they just push on.

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