Question about Marshall MG100HDFX 100-Watt Amplifier Head

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IS IT HARD TO REPLACE COOLING FAN .MG 100 HDFX?

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  • Marshall Master
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Hardest thing is getting the chassis out past the Tolex covering. Sometimes it catches and you have to use a knife blade to hold it out of the way.

Make sure to use an identical fan with identical ratings. Some of these are throttled depending on sensed heat. For those, an exact model fan should be used.

Posted on May 14, 2010

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Marshall Mg 100DFX power on no sound it just cut out last time i played it.The fan has issues I wonder if there is a cooling sensor shutting down the amp output.I thought solid state amps were bullet...


Something has probably failed or become a bad joint. If you turn up the gains and volume to max is there any hiss or hum from the speaker? If not there will be a problem in the power amp or power supply. Check fuses at back. The speaker may be open circuit too, that is easy to check with a multimeter. If you can't get far yourself, you'll need a repairman.

Solid state amps are not that reliable these days, there are so many things that can fail due to all the effects that people demand to be built in. Look at how many people are reporting problems with ss amps here.

Apr 02, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

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.

Nov 29, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

The fan on the back of my marshall mg 100HDFX is making a weird noise when i first turn it on. It eventually sounds normal after about three minutes. Im not sure what i need to do?


You can either oil it up OR replace it for around 20$
Both ways involve removing the amp from the casing by unscrewing the 6 screws on top and sliding it out and then getting the fan out

locate the fan; locate the 4 outside screw covers that are next to the fan grill screws and pop them open. Remove the four screws that are under those plastic covers. The fan should separate. Take Fan out and remember how it was in there.
To oil: lift the sticker and locate the rubber plunger in the middle of the fan; remove it. Then, put ONE drop of regular 3-1oil NOT-wd-40, pb blaster or bike lube. re-assemble
To replace: just unplug old fan and then replace with new fan. I recommend replacing the fan when it gets to the point of bearing noise because oil doesn't always fix this.

Oct 02, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

So, i think I've blown the fuse in my Marshall MG 100 HDFX head (I tried to run 2 speaker cables out of the head into a quad...stupid >.<). What type of fuse do these heads use? How can i access...


The fuse is inside the unit so as to force you to open it and look for damage.

The fuse is likely a 3 amp/250 volt type.

Replace the fuse and then put a 100 Watt light bulb in series with the hot side of the power input. If the lamp stays lit with no load on the unit, then there is damage that requires repair before use. If you just replace the fuse repeatedly you may damage further components.

In the future obey the minimum resistance load on your amps.

Aug 22, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

My mg 100 hdfx halfstack was playing at half volume then lost its volume


Have the output transistors checked. That can be a source of failure. This is something you can do yourself if you have electronics experience. If you take it to a tech they should be able to pinpoint the problem by troubleshooting the amp.

Dec 14, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

3 Answers

Buzzing fan on a Marshall mg 100 head


Try to remove the fan and look for the sticker on the back side where the wires come out.

Remove the sticker, underneath it there will be a small aluminium cap (sometimes there is no cap and the axis is readily visible when you remove the sticker).

Take the cap off with a sharp tool (it shouldn't require a lot of force to do it), now you should be able to see the fan axis being held in place by a small clamp - put a drop or two of machine oil in there, move the fan blades a little to make the oil flow past the axis into the bearing.

Reinstall the cap, put the sticker back in place, reinstall the fan and test it.

Sometimes this will make things better, but if it doesn't then it is only fair to replace the fan.

regards

Triarcuate

Sep 25, 2009 | Marshall Mg100dfx 100-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

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