Question about Marshall MG100HDFX 100-Watt Amplifier Head

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We plugged it up and turned the amp on and it made a pop sound and stopped working

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Sounds like you blew a fuse.
a bad ground could've caused this.
refer to the rear of the head.
Most have threaded screw fuses.
Replacements can be found at pretty much any music store

Posted on Sep 30, 2009

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Amp turns on but puts out no sound except for faint noise which dies out after a few seconds.


It sounds like a defective/incorrect AC-to-DC adapter may have caused your problem. These adapter come with different output voltages, AC or DC output and different amperage ratings. AC-to-DC adapters list the polarity of the DC voltage as it relates to the DC power plug and you must match both the devices voltage and power requirements. As for the amp...not working on batteries either, I would suspect output transistors or IC.

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The amp does not work at all even though the lights on the amp come on but when i connect it to the guitar no sound whatsoevva i checked the sound nobs on the guitar and the amp n all r ok but no soun


Have you checked a different cable?. Also, when you plug in the unit, there should be a "pop" if everything is turned on. If there isn't, the connection is bad someplace.

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I Just bought a brand new Fender Hot Rod Deville 2x12. I get no sound when i turn it on. I can hear the hum of the speaker, everything lite up, including the two 6L6 tubes. When i plug into the jack, i...


If it is new then something is a bit strange to say the least. Turn all the knobs to midpoint. If it is going to click/pop then you will definitely hear it. Switch to standby, then power to on for a minute then standby to on. You should then see the 6l6 and the 3x 12AX7's all glowing. Plug into each channel. Don;t use a pedal to try any of this. If you get a pop on on ch then it can be one side of the preamp either a tube or one of the op amps on the board.

Make sure you try out the cable/guitar on a different amp to make sure it is working. Could be a cable or plug that is the problem.

Honestly if this is new I'd haul it back to the store and return it. It should just work with no hassles. Once you know your guitar/cable is not the cause then I would take it back and get them to either set it up or replace it. Something is just not right here for a brand new amp.

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1 Answer

Is there a fuse in this amp? is it replaceable without soldering?


Hi, blowing a fuse in an amplifier is a problem that most guitarists face at one time or another. If an amp won't turn on, or it turns on for a second, then makes a popping sound and turns off, the problem is usually a blown fuse. Though a blown fuse can be a hassle, especially during a performance, it does not have to put a stop to your musical enjoyment. With a spare fuse you can be back jamming to your favorite tunes in no time flat.

Things You'll Need

Fuse.

Instructions

Turn off the amplifier and unplug it from the wall.

Locate the fuse, which is usually found at the back of the amp. The fuse will look like a small black wheel sticking out of the amp with a number and the letter V next to it. For example, 9V.

Gently turn the fuse counter-clockwise to remove it from the amp.

Discard the old fuse.

Insert the new fuse into the empty fuse slot and turn it clockwise until it is firmly in place.

Plug in the amplifier; make sure the power switch is in the off position.

Turn the amplifier on to make sure the new fuse is working properly.



Hope it helped..

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1 Answer

I have a Marshall MG100DFX. I turned my amp on a few days ago and I heard this loud sound (not the standard hum/buzz that you hear when you plug a guitar into an amp; it sounded more like a foghorn). Now,...


I would try hitting the side of the amp before turning it on. There may be a loose piece of solder or other conductive particle stuck somewhere. Bang the cabinet rather hard with your fist. If that doesn't help it might be a loose solder connection at a resistor or capacitor but a tech should check that out.

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2 Answers

My warlock makes this horrible noise as i plug in the cord. I don' have ANY idea why. I've been messing around with it and still nothing has worked out. It makes the sound as if my amp is turned all the...


If the noise is a pop or click, that's normal. Any other sound could be caused by too long a cord, which will produce noise while on the floor.

If it's not the cord, then you most likely have something wrong with the wiring inside the guitar. Have a luthier (guitar builder and technician) look at it, and s/he should be able to fix the problem.


Hope that helps!

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2 Answers

WHEN I'M ON THE CLEAN CHANNEL AND SWITCH TO DIRTY WHILE PLAYING, I GET A POPPING SOUND FROM THE SPEAKERS. PURCHASED 3 DAYS AGO AND THIS STARTED RIGHT OUT OF THE BOX!


You are likely driving the unit too hard.

When you drive a speaker too hard the voice coil is driven beyond the linear range of movement and the speaker will "pop" as it hit the end range.

Compare to an identical unit. This problem is common when one gets too small a unit and tries to get too much out of it.

The dirty setting of the amp flatops the signal and drastically worsens the problem.

People buy a 15 watt amp and expect it to sound like a 200 watt and it just doesn't happen. You have not given us the model number so this is my best guess.

If your unit has a 12 or 15 inch speaker, it should NOT pop unless you really overdrive it. It is very hard on both the amp and the speaker to have the popping condition. I won't get into the technical reasons at this time.

Mar 18, 2010 | Music

1 Answer

Amp doesn't do anything.


If you hear a pop when you turn it on and the squeak when turning off most of your amp is probably working.Depending on whether it is a tube or solid state amp there are several things to consider some being as simple as a deadLED or bulb in the pilot light and a defective input jack to as complicated as a dead power supply to the preamp circuitry. If you are not familiar with safety procedures and electronic trouble shooting and have no test equipment and the schematic you might be better off having it serviced. Here is a link to a troubleshooting guide:http://www.geofex.com/ampdbug/ampdebug.htm A lot of the info can be applied to solid state amps. Hope this helps.

Jan 19, 2010 | Music

1 Answer

Line 6 spider 210 volume problem


The bypass switch in the headphone jack is likely broken. NEVER unplug the headphones while the amp is on.

There are certain small amps that have a possibilty of popping the power amp due to a feedback arrangement. Likewise, never use the headphone jack for ANYTHING other than headphones.

Dec 20, 2009 | Music

1 Answer

Popping noise


Your welcome. I'm glad I could help and if it came that way marshall should do it for you.

Apr 25, 2009 | Marshall 15 Watt Guitar Amp

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