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Anonymous Posted on Jul 31, 2012
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Marshall avt 100 keeps blowing fuses - Marshall Music

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tednugentlives

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  • Posted on Apr 24, 2019
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Failed output transitor

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Michial Gueffroy

  • 1140 Answers
  • Posted on Nov 28, 2009

SOURCE: i have a marshall avt 100 which was working fine

This is a problem I would recommend for a qualified Marshall amp service person to look at. Worst case scenario is that somehow the speaker out put transformer or the power transformer burned out. They aside from output tubes are the most expensive parts to replace. Add shop labor on top. Ask for an estimate first. Consider how much a new amp will cost and then decide. I would personally go for the repair myself.

Testimonial: "thanks for the help about my avt i will get it mended i think as it isnt a bad amp, cheers"

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Fred Yearian

  • 5603 Answers
  • Posted on Mar 02, 2010

SOURCE: blown fuse

Continued replacement of fuses without fixing the reason for them blowing MAY be doing additional damage to components in the unit.

It needs to go to a repair shop. It is likely there is damage in the power supply section or that of the power amplifier section.

Anonymous

  • 4803 Answers
  • Posted on Feb 15, 2012

SOURCE: Marshall AVT 100 dfx doesn;t work

junn561,
Thank you for asking me directly to help you with your problem. However, either the question you are asking is not within my area of expertise (I am an automotive repair technician), or the question is incomplete and does not contain enough information for me to help you.

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0helpful
1answer

Where is the fuse located on the marshal amplifier MG series 100 DFX 100
  • fuse on the Marshall MG100DFX amplifier is located on the back panel of the amplifier, near the power cord.
To access the fuse, you will need to follow these steps:
  1. Unplug the amplifier from the power source.
  2. Locate the fuse holder on the back panel, near the power cord.
  3. Use a flathead screwdriver or other similar tool to gently pry open the fuse holder.
  4. Carefully remove the fuse from the holder by pulling it straight out.
  5. Inspect the fuse to see if it is blown or damaged. If the filament inside the fuse is broken or the fuse is discolored, it may be blown.
  6. If the fuse is blown, replace it with a fuse of the same rating. The Marshall MG100DFX amplifier uses a 2A, 250V slow-blow fuse.
  7. Insert the new fuse into the holder and press it down until it clicks into place.
  8. Close the fuse holder by gently pressing it back into place.
Once you have replaced the fuse, plug the amplifier back into the power source and turn it on to see if it is functioning properly. If the amplifier still does not work, you may need to have it serviced by a qualified technician.
Read full answer
Mar 14, 2023 • The Music
0helpful
1answer

Why my Marshall amplifier immediately blows fuses?
It could be a failed power supply capacitor, it could be a shorted speaker, it could be a shorted cable. It might also be a conductive piece of trash in just the wrong spot on the circuit. They would be the big ones of about 5000 microfarad give or take a few hundred microfarads.

Though a little less likely, there could be a short of failed component in the output stage.of the amp.
Read full answer
Sep 25, 2012 • Marshall MG100HDFX 100-Watt Amplifier Head
2helpful
1answer

External Speaker hookup problem. I hooked up 2 external speakers (8 ohm, 160 watt) into my Marshall AVT 50 amp (tag on back says 4 ohm minimum). Everything worked fine, then I shut it down and now (next...
If you are competent with electronics, open it up and check the fuse(s). Especially if no lights come on. If you get voltage, then check the jacks you plugged into- they may have dirty interrupt contacts. When you plug the jack in- it opens those contacts that otherwise are closed making the circuit to the cabinet's built in speaker. Contact cleaner should clean them up if that is the issue.

While it is possible there is a power supply issue, you can see that quick with a voltmeter, it is not likely you did much more than blow a fuse.- very possible if you unplugged speakers with the amp operating..

If you think you killed it- you usually still get distorted noise.
Read full answer
Mar 29, 2012 • Marshall Amplification Music
0helpful
1answer

Marshall AVT 100 dfx doesn;t work
junn561,
Thank you for asking me directly to help you with your problem. However, either the question you are asking is not within my area of expertise (I am an automotive repair technician), or the question is incomplete and does not contain enough information for me to help you.
Read full answer
Dec 11, 2011 • Music
0helpful
1answer

I need to replace the fuse for a used Marshall MG100HDFX that I bought. Where is the fuse located inside the head?
If the fuse is blown make sure the reason it blew is repaired before replacing the fuse. Start the amp up after replacing it with a 100 Watt light bulb in series with the hot side of the power into the unit. This will act as a current limiter to verify it is repaired and will not blow the fuse. When you open the unit the fuse will be obvious... Follow the hot side of the power cord, through the switch to the fuse.
Read full answer
Dec 08, 2010 • Marshall MG100HDFX 100-Watt Amplifier Head
0helpful
1answer

Have marshall mg100 hdfx head -power it up and blows fuses right away!
This is either a shorted component in the power supply section or in the power amp electronics itself. Continuing to replace a fuse MAY damage additional components. Take unit in for servicing.
Read full answer
Nov 29, 2010 • Marshall MG100HDFX 100-Watt Amplifier Head
0helpful
1answer

Whats best settings for blues on clean and classic on overdrive channel for the mg250dfx marshall playing a g&l s500
Join this forum:http://www.marshallforum.com/marshall-amps/2682-marshall-avt-50xt-tribute-owners-please.html
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Nov 08, 2010 • Music
3helpful
1answer

Marshall mg100dfx, internal fuse blowing every time you switch on the unit. What could be the problem
The way you troubleshoot this is to put a 150 watt lamp in series with the input power cord. The lamp acts as a resetable fuse and will limit the current while you look for the bad component. Start with the capacitors and rectifiers connected to the power transformer.
Read full answer
Sep 30, 2010 • Marshall Mg100dfx 100-Watt Combo Guitar...
1helpful
1answer

Blown fuse
Continued replacement of fuses without fixing the reason for them blowing MAY be doing additional damage to components in the unit.

It needs to go to a repair shop. It is likely there is damage in the power supply section or that of the power amplifier section.
Read full answer
Feb 28, 2010 • Marshall MG100HDFX 100-Watt Amplifier Head
1helpful
1answer

I have a marshall avt 100 which was working fine until i plugged new guitar in strummed one chord and the speaker went **** up, so i plugged into another cab and played a while then a week later plugged in...
This is a problem I would recommend for a qualified Marshall amp service person to look at. Worst case scenario is that somehow the speaker out put transformer or the power transformer burned out. They aside from output tubes are the most expensive parts to replace. Add shop labor on top. Ask for an estimate first. Consider how much a new amp will cost and then decide. I would personally go for the repair myself.
Read full answer
Nov 27, 2009 • Marshall Mg100dfx 100-Watt Combo Guitar...
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