Question about Marshall MG100HDFX 100-Watt Amplifier Head

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

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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.

Posted on May 10, 2010


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MY Marshall JCM 2000 100Watt head is quiet TURNED fully on stand by OFF and ready to plug guitar into the INPUT Jack. Soon as I plug into the INPUT Jack cracking noise hissing noise.

I would suspect a bad cable. Also, these symptoms show up if you mistakenly use a speaker cable (unsheided) as a guitar cable (shielded).

Dec 12, 2016 | Marshall Music

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

Hello, I have a Marshall MG50DFX and the fan is making a lot of noise. I saw a post from crispy_tophe and I'm looking for info. on where can I get the fan and what is the procedure to remove/replace it?...

Best thing is to open the unit and extract the fan and find the EXACT model number fan online and replace it. There are only two wires to solder., but mechanically these can be a mess to get to.

Sep 08, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

I have marshall 250 dfx when i turn it on cooling fan makes weird noise then plays 10 min. amp starts fading in & out

Try carefully cleaning your cooling fan with qtips for the blades and a vacuumn. See if that helps the fan. If not it will need to be replaced. If you are experienced with amp repairs have a look for loose parts on the circuit board. If you can safely disassemble it, look at the soldered side for bad solder joints. From another poster on here with the same problem I have learned that resoldering R107 and R96 helped. Make sure they aren't burned out or have changed in value.They are in the FDD circuit. Have a look at your owners manual and it will make sense. The schematic is available here: If it doesn't come up use the search function on that site. Do not attempt to service this yourself unless you are absolutely sure you won't hurt yourself or the amp.

Mar 02, 2010 | Marshall Amplification Marshall MG250DFX...

1 Answer

Dear experts, i have a MG100HDFX and no sound seems to come out. i replaced the burnt fuse inside the head and i disconnected the timer for the cooling fan cuz thats what kept blowing the fuse. With the...

The problem is not likely to be the fan. I would suspect the output section of the amp to have a problem. These units use a 15 leg power IC for the output. Look for a small IC attached to the heatsink. It will be marked TDA7293V. This is the likely defective part.


Jan 07, 2010 | 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.



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

2 Answers

Seems to be a noisy fan on mb4210 combo

Could very well be the fan. The motors can cause interference. There may be a solution to get rid of the noise. Some copper shielding tape may help. You could rule out it being a microphonic preamp tube by turning the amp on as normal and tapping the tubes with something non-conductive. If you hear the tapping noise coming thru the speakers while doing this to a particular tube, replace it. With power tubes, the tops of them turn white on the top when they become microphonic, along with plenty background noise.

Apr 18, 2009 | Marshall Music

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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