Question about Marshall MG100HDFX 100-Watt Amplifier Head

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Schematic ? I am in need of a schematic for Marshall MG100HDFX. Originally it had a schreeching sound that came and went. Easy problem loose ground wire. Now clean channel will not clean up. Op amps and caps are fine in it.voltages are all to spec. any ideas.

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You need to check those capacitors. A weak or bad one will create unwanted noise and hiss!

Posted on Dec 13, 2009

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This is the closest you will get right now:http://www.ampix.org/albums/userpics/10003/MArshall_MG100DFX.pdf This is also handy:http://www.geofex.com/ampdbug/ampdebug.htm The only difference between the HDFX and the DFX is the HDFX is a seperate head for a stack and the DFX is in a cab with 1X12. Hope this helps.

Posted on Oct 23, 2009

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Http://www.farnell.com/datasheets/36657.pdf

That's a schematic for part of it. Sorry, that's the best I could do, I'm looking for the schematic myself. :(

Posted on Oct 22, 2009

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Where can i order a replacement fan for a mg100hdfx online..can't seem to find one..not even on ebay?? thanks

Posted on Sep 09, 2009

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1 Answer

Bought amp with no footswitch


The schematic shows it as a standard 1/4 inch stereo plug. Wire the ground common to both switches (Channel and DFX), the ring to one switch and the tip to the other...I.E. ground (sleeve) to ring for one switch and ground to tip for the other. You'll have to experiment with which switch operates what function and label them accordingly.

Nov 02, 2012 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Marshall mg hdfx100 power switch fell off, is there a way to turn it on without the switch


power switches are pretty easy to replace, i have the mgdfx50 and its only 4 spade connectors, 2 blue and two brown, doesnt have to be a marshall, just a 4 pole switch from an electronics store

May 24, 2012 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Sound only come through headphones and not speaker jacks. cables are good all connections good


Headphone amp is separate from the power amps. Likely you have a pwer amp issue. They use TDA7293 chips. Here is your schematic:

http://elektrotanya.com/marshall_mg100dfx_sch.pdf/download.html

Scroll down to "get manual" and click on it to download. Ignore other download links.

Jul 13, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

I have a Marshall head mg100hdfx. It was pluged into a outlet that had been wired wrong.The amp came on and worked for about 5 seconds and then went off and will not do anything now.I took it apart and...


Unless the receptacle was wired with 240 volts, NO DAMAGE would be done. First thing to check is to turn amp on and use an ohmmeter to check for some continuity between the blades of the plug. Common problem is that the power input cord doesnt seat fully where the cord attaches to the amp.
Here is your schematic:
http://elektrotanya.com/marshall_mg100dfx_sch.pdf/download.html

Scroll down to "get manual" and click on it. Ignore other download links. A fuse cannot always be visually checked. They sometimes fail mechanically and loose fuse clips are common problems. Do the contiuity check. The transformers rarely fail, so don't let an incompetent tech tell you it is bad.

Jun 25, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Marshall mg100hdfx head-2 red wires going to the transformer,1 is on the left side of it and the other is third from left-which is m4 and m5 on the board?


They LIKELLY don't matter which as long as you are sure the pair went there originally. Manufactures will usually use a different color where there is a particular connection.
These two wires may be the ends of a centertapped winding so it doesn't matter which of the two terminals they go to... HOWEVER Marshall usually has the markings in sequence so there would be an M4,M5 and M6 if centertapped... so this probably is not a center tapped winding anyway and does not matter which is which....

Jan 12, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

No head!


They were designed to be used with the Marshall MG100HDFX heads.

Jun 30, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

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


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

Sep 29, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

3 Answers

Marshall mg100hdfx loud fuzz and distortion and no guitar sound


Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.

Jun 25, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

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