Question about Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier

2 Answers

Marshall MG 250dfx head gone bad need help thanks

Ok so it started that one speaker went out and i was like hmm then i didnt bother it sits in my room so i keep going then both went out i was like dang then I pulged my other head to the speakers to see if there were blown they work just fine. So i thought it was the input wear the guitar plugs in then i realize if that was it they would both have gone out so its the back speakers out i love this amp if someone could help me i would be forever in there debt thanks.

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Ok guys, read your your posts and i have to say that ive experienced the same symptoms with my dfx250mg. I am a bit of an an adventurer, so i decided to take apart the head and diagnose the issue myself, this is what i came up with. The sections R107 and R96 of the large circuit board have overheated (likely linked to the faulty cooling fan of this particular model). Anyways, i reconnected them temporarily and the problem subsided. Now to resolder and test the results.

Posted on Mar 01, 2010

  • maybeitscal Mar 04, 2010

    My solution was resoldering the two that cam lose, which i named above. Sounds like it did the day i brought it home

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,137 Answers

Try checking for internal fuses mounted on the circuit board. Be very careful when taking them out and use a pencil or plastic tool of some sort to pop them out of their holders. Use only your right hand to retrieve the fuses. Absolutely make sure the amp is unplugged. Use the exact replacements for the fuses. If they blow again your problem is most likely a part in the output section named TDA7293. This is not something I would recommend you trying to replace yourself. If you have electronics experience with safety procedures, soldering skills and tools the schematic is here:http://www.ampix.org/albums/userpics/10003/Marshall_MG250dfx.pdf Hope this helps.

Posted on Feb 04, 2010

  • Joshua Feb 09, 2011

    The marshall MG's and AVT amps all use the same TD7293 IC and the terrible cliff jacks. The inputs/outputs get gummed up or loose and start blowing fuses and sometimes even starts blowing the power ic's. I recently had to rework mine due to the exact same reason! Be very aware of the cliff jacks on these amps ... they even cause weird problems because they are used for the speaker output 1/4" as well.(the two or one 1/4" outputs on the back of amp that are usually red colored.)

    Good Luck!!!

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My Marshall 250dfx has stopped working, there is power but nothing is coming out. No crackiling before, one min it was fine, the next it stopped.. Help!!


try another speaker or test the speakers on another amp. if the speakers are working then it's your amp . check out the output ic's. they maybe blown.

Dec 03, 2013 | Marshall Amplification Marshall MG30FX...

1 Answer

How to fix an output jack for a marshall mg 100 fx. Came loose and is inside the amp


You have to remove the amp from the case. These jacks are JUNK and it likely will have to be replaced. In any event, the amp has to come out to work on it. Several screws in the case and OFTEN the screws holding the handle. Be careful of the speaker leads.

May 23, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Hi i have the Marshall MG15FXMSDM Dave Mustaine Megastack and i also have the programmable footswitch. the other day, i was plugged into a big surge protector and the footswitch was working fine. i...


First thing is to verify the MAIN power source is getting to the amp. It may not be the fault of the footswitch at all. Connectors and cables are the usual cause of these problems. Seating of connectors is a common problem...

Mar 02, 2011 | Marshall Amplification Marshall MG Series...

1 Answer

Can i connect 2 jbl 300 watt speakers to the mg 100hdfx 100 watt amp head ?


Yes you can as long as the speaker impedance when paralleled doesn't go below the rating of the amp. Marshall seems to hide their design lowest output impedance. Possibly you can find that in your owner's manual. Then find the impedance of the JBL. If half the JBL impedance is equal to or greater than the lowest impedance the Marshall is rated, you are fine to use it. The speaker Watt rating should always be bigger than the amp rating which it is in this case.

Dec 11, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

By mistake i plugged the speaker jacks from another amp into the speaker jack on my mg 50. i was trying to test the other anp with the speaker on the marshall but i did it wrong. i didnt turn the marshal...


If you connected an external speaker plug from one into the same type plug on another amp, you have driven signals backward into the amp that was off... NOT into the speaker in that unit.

The usual result is blown parts in the amp that is off.

Some amps have their own speaker cable that you can unplug to connect to another amp and that is fairly safe. NEVER run an amp without a speaker load on it.

Feb 20, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

2 Answers

Marshall mg 100hdfx fan


Some of the Marshall equipment uses computer size fans and even on occasion the same connection.

Take the bad fan with you to a computer repair shop it will be much cheaper than a marshall part they should be able to help you out

Sep 09, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Hi,I turned on my Marshall mg series 100 dfx and there is no sound,just static comes on.Its starts with a kinda bad feedback sound than turns to loud static.


I suspect the power supply for the effects processor has failed. The effects unit will "go crazy" when power supply is too low voltage.

If the amp has loud noise, then the power amp portion is PROBABLY OK.

I had a similar problem in a Behringer amp caused by a bad electrolytic filter cap.

Aug 11, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Feedback noise when overdrive is on


it could be your guitar pickups. try using another guitar or getting your pickups waxed at your local music store. also if your playing in a small room kind of loud, or if your using single coil pickups (like fender statocaster pickups) you will definitely get a feedback noise. if that does not work let me know.

May 10, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

Not finding what you are looking for?
Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier Logo

692 people viewed this question

Ask a Question

Usually answered in minutes!

Top Marshall Amplification Music Experts

matt martin
matt martin

Level 3 Expert

1208 Answers

Vito Vacirca Jr.

Level 2 Expert

140 Answers

The Knight
The Knight

Level 3 Expert

73647 Answers

Are you a Marshall Amplification Music Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...