Question about Marshall MG100HDFX 100-Watt Amplifier Head

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Marshall mg 100hdfx fan

I AM TRYING TO FIND A REPLACEMENT COOLING FAN FOR A MARSHALL MG100HDFX AMP HEAD. CAN'T EVEN FIND ONE ON EBAY??

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  • marty0108 Sep 10, 2009

    thanks for the info..have to take unit apart and see what type of fan is in it. looks like just a few screws at the top will let the electronics drop out in one unit.should be east to access the fan then..the 2 fan idea is a really good one. the cooler the better. i don't have it up past about 3 or so anyway..not giging with it. thanks again..marty

  • marty0108 Sep 10, 2009

    thanks for the info..have to take unit apart and see what type of fan is in it. looks like just a few screws at the top will let the electronics drop out in one unit.should be east to access the fan then..the 2 fan idea is a really good one. the cooler the better. i don't have it up past about 3 or so anyway..not giging with it. thanks again..marty

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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

Posted on Sep 09, 2009

Testimonial: "that sounds like the best way to do it..will just take fan to computer shop and try and get a replacement...thanks for the assistance"

  • Project NOMAD
    Project NOMAD Sep 09, 2009

    Just a thought.



    There are fans and there are fans proably wont matter if you are cranking but look out for the ultra quiet ones.

    Also of you can fit more than one anywhere do a push pull with an extra fan one to pull coller air in and the other to push the hot air out



    Makes equipment run a bit better IMHO and also helps keep dust out too !



    If its one of the bigger fans then your next bet is an AUTO shop, dont laugh those things appear on lots of BIG racks and cool the h3ll out of em.

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I was having the same problem and here is a video I found that shows you exactly what to do

http://www.youtube.com/watch?v=fAKdrNAhV5w

Posted on Feb 16, 2011

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2 Answers

My amplifier keeps going silent every couple of minutes


Try cooling or warming it to see if it stays on for more time(for cooling) or lower (for warming)...
If it does maybe the final stage of amplification (havent seen the scematics to tell you the exact component) must be overheating and stop its operation for safety and don't burn itself...
You should check the power supply for correct voltages and if they are correct change this chip with a new.
DONT change the IC before checking the psu because it may broke the new one too..

Mar 11, 2012 | Marshall MG100HDFX 100-Watt Amplifier Head

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

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

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


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.

May 09, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

My marshall mghdfx head fan makes noise when you first turn it on. what is this?


Some cooling fans are "throttled" depending on the sensed temp... these CAN be noisy upon initial startup.

It can also be bearings going out... best plan is to watch it and see if it gets worse.

Changing a fan is fairly easy. You have to observe the polarity of the connections. Replace with identical unit.

May 09, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

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

1 Answer

Cooling fan ,heat sink MG100HDFX does fan blow out or **** cool air in? Someone left it unassembled..


If you can get two IN then do it but make sure one is pushing air out and the other sucking in.

Feb 01, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

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