Question about Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier
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.
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
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
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Posted on Jan 02, 2017
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