Marshall Music - Recent Questions, Troubleshooting & Support


Check that you have 15 volts across C19 and C20.

If either are bad, suspect ZD1 and ZD2 regulating Zener diodes.

Check the soldering and condition of the input jack as these are chronically bad due to damage of yanked cords.

Marshall 15 Watt... • Answered on Dec 14, 2020


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"

Marshall Music • Answered on Aug 30, 2020


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

Marshall Music • Answered on Aug 01, 2020


I suspect the vibration when it is loud is vibrating a reverb tank within the unit.

Test this bylistening with headphones and see if you get same sound.

It may be the reverb has a resonance or the cabinet does that is sensitive to your E chords.

The shock mounting of the reverb may have failed to isolate the reverb tank from speaker vibrations... hence the headphone test.

Marshall 15 Watt... • Answered on Mar 01, 2020


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.

Marshall Music • Answered on Feb 09, 2020


The Marshall Islands has been considered as one of the economically and politically stable country which is prevalent for the splendid business environment, favourable and low tax regime together with unlimited business opportunities. If you want to register a company in the Marshall Islands, it requires a minimum of one Shareholder, one Director and one Secretary - they can be the same person. The director of that company can form any nationality as to the company choice. A standard formation is 500 registered and bearer shares without par value, or up to 50,000 USD worth of par value stock. The notable matter is that the Marshall Islands company formation is a very flexible, tax-free structure, with few restrictions on the business that the company can engage in.

Marshall Music • Answered on Dec 16, 2019


Failed output transitor

Marshall Music • Answered on Apr 24, 2019


This amp has a design defect in the TDA7290 power circuit board. The heat sink is too close to main board when installed (at 90 degree angle) and can TOUCH the power signal on the board shorting out the fuse and/or transistor. I bent back the heat sink bracket slightly and it powered on fine. Also, the cooling fan must be 100% flowing or the transistor will cook in a short time, replace it also with new transistors (its a 5v computer chip fan). Good luck from Arlington guitar shop dot com.

Marshall MG 50 • Answered on Apr 24, 2019


On main circuit board, remove the chassis

Marshall Music • Answered on Apr 24, 2019

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