Question about Marshall MG100HDFX 100-Watt Amplifier Head

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The sound on my mg100hdfx cuts out sometimes then its fine what could this be

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Common problems are broken or intermittent input jacks or cracked circuit board or soldering or broken volume controls. Another one is a bad switch contact on the jack for PA input connection. All these are internal and require servicing.

External problems are guitar and cable problems.

Posted on Jul 15, 2010


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1 Answer

I have a marshall mg100hdfx head. it was working fine and I turned it on it started screaming like feedback at full volume. it does this with all volume at zero and without anything plugged in the inp

This could be many things and unless you are electronically adept it is unlikely you can DIY the repair... HOWEVER I want you to try one thing first: Sometimes the contacts on the switches of the Effects send and return go bad leaving the input to the power amp section floating and it can feedback. To test this, plug an INSTRUMENT cable between the send and return effects jacks on the back. This bypasses the contacts, If the amp behaves, you could run it this way getting a short cable or have the amp worked on at a shop to replace the jack. The jacks are really rather poor quality on musical amps in general.

May 13, 2012 | 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:

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

With volume set at 0-3 no matter what channel it is on it sometimes plays quiet and sometimes plays normal and out of nowhere the volume spikes very high. Also there is not much adjustment above 3. The...

Plug a set of headphones into the EFFECTS SEND jack... only one side will have sound... now see if the level varies at that point... Note that the soumd will not be too loud and only in one ear... but we are wanting to find out if it varies at this point.

Jan 16, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

I have a MG100HDFX head, with the cabinet that came with it and the other I plugged in, the amp sounded fine for about 5mins while i was warming up. Then it started to fade in and out with a very fuzzy...

I would first suspect the head... try driving a different speaker to isolate which is at fault.

If unit starts working when cooled down, it may be going into thermal protection due to any of several causes including a defect or overdriving it.

Nov 15, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

I have a MG100HDFX head. the output ic was bad. I replaced it still no sound. Any ideas ?

Does anything come out of headphones when you plug them in? If not, you have power supply problems as well...

Nov 03, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

MG100HDFX 100-Watt Amplifier Head: my power switch fell out and i would just put it b...

The switch appears to be a standard rocker switch... Sometimes auto-parts stores have these or better hardware stores.

The switches normally have leads that push on and then snap into place held by plastic springy things.

You can also find replacements via and

Search for "SWITCH ROCKER"

May 18, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

My marshall mg100hdfx digital fx rack wont work

sounds like the effects module has stopped working . you could try re-working the joints around the i.cs on that board if you have a rework station. i have only managed to repair one baord this way suggest replacement is the best course of action. uk cost of panel approx £50.00 + fitting

Jan 28, 2010 | 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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