Question about Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier

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Marshall Lead 100 Mosfet head, no sound.

I have a marshall lead 100 mosfet from the 80's, it turns on but it doesnt put out sound through the cab, tried a different head through my cab so i know its the head thats causing the problem. please help.

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Are you popping fuses??? check the effects, preamp, and power amp jacks to make sure they (even if not in use) are Normally Closed. Sometimes they loose their contact to ground on the Tip of the jack, which opens the circuit and interrupts the normal function. then check the input jack for good contact to the pcb and solder joints, as well as all pots (especially the volume). if all this checks out, and it still is having issues, i would then move on to the grounding resistors (solder welds can heat up and break as these resistors get hot) and resolder them to the board. still no output, then diodes / rectifier / filter caps.

Posted on May 04, 2010

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For me when I couldn't get a sound a put a a regular cable or 1/4 Mono to 1/8 Adapter in the back where it says "Return" but not all the way about half way through. Make sure your cables are plugged in and are no high volumes while you do this because you want to be strumming as you pull in and out of the Return jack.
In case it isn't the Return Jack try it on the Output or Send. One of these might be oxididate like my Return was.

Posted on Sep 10, 2010


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