Marshall Music - Recent Questions, Troubleshooting & Support

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Marshall Music | Answered on Dec 16, 2019

Failed output transitor

Marshall Music | Answered on Apr 24, 2019

Failed output transistor

Marshall 15 Watt... | 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

Remove all the phillips head screws. Then, where the power cord comes out,use a small thin screwdriver to pry that area outwards. Then pop the back off.

Marshall Music | Answered on Nov 14, 2018

First, I'd like to know why you are trying to open it, just in case you don't need to. No audio for instance sometimes is an issue that can actually be solved without opening up the head of the unit.
Give me an idea what the issue is, and I'll tell you if you even need to open it up.

Marshall MG 50 | Answered on Nov 02, 2018

If he KNEW it "just needed a fuse", why didn't he "just" replace it.
Could have sold it for a lot more if it worked,
The fuse is on the end of a circuit board right behind the power transformer, It should be a little glass fuse.

Marshall... | Answered on Oct 04, 2018

Just to make sure, plug a cord into each input and unplug it.
Make sure that any nuts around inputs are not loose.
If it is a tube amp it could have a bad tube,
Those are the easy things to try. That will help eliminate external connections and grounds. If that doesn't help, there is likely an internal bad ground c8nnectionsr , or a bad filter capacitor'

Marshall Music | Answered on Oct 04, 2018

Turn the volume down and use line out.
I am guessing that you want to hear yourself practice.

Marshall Music | Answered on Oct 04, 2018

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,

Marshall Music | Answered on Oct 04, 2018

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