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Marshall amplifier I have an old marshall guitar amp that keeps blowing a fuse. How do I figure out what is cuasing this and fix it?

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Old marshall eh ?? how old ? is it solid state or tube.

Posted on Jan 08, 2008

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    HARE BUTLER Feb 23, 2008

    if it's tube, the bios is set wrong for the preamp tubes.

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1 Answer

Blew a fuse now amp wont power up


It must go to a repair shop. There's always a reason that a fuse blows.

Jan 28, 2014 | Marshall Mg100dfx 100-Watt Combo Guitar...

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The guitar is not amplifying


faulty lead? when the lead is plugged in turn the amp distortion on (may be called 'gain') and when you tap the end that goes into the guitar with your finger you should hear a buzz. try another lead if not, and if it still doesn't work make sure that volume is up on the amp and the guitar. there may also be a knob in the back of the amp, turn that up too (but not all the way or when you do get it working you'll blow the speakers out).

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My Marshall 4502E Amp switches on fine. However when you flick the STANDBY switch on it blows the 1.3A Fuse every time. Any solutions, baring in mind I have checked all the diodes, resisitors, rectifiers...


I would first check the filter electrolytic caps for shorts...

This is the WAY you work on this problem. Replace the fuse and put a 60 or 100 Watt incandescent lamp in series with the HOT power wire. This acts as a current limiter/automatic resetting fuse and you can search out where the current is going. Old trick we have used for more than 50 years. Also using a Variac to control the voltage can be useful, but the lamp should get you through the problem...

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Can i fix one ampli marshall mg100 i had used my bass, and now my marshall have a very estrange noise


Well i know ive destroyed a guitar amp with a bass guitar before :-p this is why they make bass amps and guitar amps instead of just amps

Sep 25, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

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Hi i am john... i have a 100dfx mg series... it is


There are MANY more likely components than the transformer that will cause the fuse to blow.

Most common are filter capacitors, rectifier diodes, and shorted components in the power amp section.

Transformer failure is very UN-likely. Have a competent electronic tech troubleshoot the unit.

When testing the unit, put a 150 watt light bulb in series with the power line... saves fuses during troubleshooting. This limits the current so one can analyze the real cause of the problem.

Jul 12, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

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My marshall mg50 dfx keeps cutting out and stuttering, any idea what the problem is? It sort of cackles as well when the volumes increased giving me different variations in sound.


As a guitar player myself learn that not all speaker from some amps hold the ouput wattage. The fuse could ba a problem or the speaker is giving out.

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Hello endaya try www.digikey.com if you are using a 2amp buss fuse, its available, 117V is applicable to 220V, just follow the amp rating.

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Is there a circuit breaker


There should be a fuse holder near the place in the back of the amp where the power cord plugs in. Also some Marshalls have fuses in fuse holders on the circuit board. Always replace with the same value and type as the original fuse. Never open up the amp when it is plugged in to the outlet. When replacing the internal fuses do not touch the capacitors as they retain a lethal charge. If the fuse continually blows it is an indication of a more serious problem which will require servicing by a qualified repair person.

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Something has blown?


The output transistors may have shorted and caused a resistor to smoke (literally!!). This should not be too expensive a repair for anyone that works on these amps. Figure on $20-$30 for parts.

Dan

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There could be a short in the rectifier diodes or in the transformer itself. Can you take some measurements inside the unit?

Let me know.
Dan

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