Marshall MG Series Amplifier Noisy Fan Replacement Repair Guide - MG100DFX Guitar Combo, 50x10mm Fan
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- Опубліковано 15 лип 2024
- In this video I repair a faulty Marshall MG series combo guitar amplifier with a bad cooling fan. When switched on a loud grinding, rubbing and whirling noise would come from the fan for around a minute or so, then stop and be OK until left standing again.
This is a common issue with this series of Marshall heads and combo amplifiers that use the small 50x50x10mm cooling fans - but it is a pretty cheap and easy fix to perform as I show in this video.
The replacement fan needs to be 12 volts and measure 50mm across, and 10mm thickness. The thickness (10mm) is very important as the screws which hold the fan in pass through it and into the heatsink - anything thicker will NOT fit/work without different replacement screws.
The fan only requires 2 wires (red and black) as shown in the video, if your fan has any extra wires simply leave them disconnected as they are used for speed control and sensing, which is not required in this situation.
The best method by far is to solder the new fan onto the old fan connector/wiring and heat shrink the join as I do here, I strongly advise this over connector block or twist and tape methods as it gives a proper, secure and reliable connection.
Suitable replacement fans can be purchased online from the likes of eBay, Amazon and even computer or electronics retailers, some stores/shops may also carry them.
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Video recorded in 4K Ultra-HD using an iPhone 6S. - Наука та технологія
Cheers mate. Great tutorial
How great of you Sir..that you know how to instruct beautifuly......!
I love my E. guitar; unfortunately it has been annoying me for years by making a stormy noise.___It is Marshall MG 100 HDFX with TWO built in loudspeakers. I am afraid whether I could replace them perfectly as you did. It requirs skills There is no music technician in the Town where I live...........................................................................................................
I would be grateful if you could kindly recommend me a technician whom you know.
With best wishes.
Yours sincerely Berhane.........................................
Thanks for posting this, my MG100HDFX had a slightly different two pin adapter and I was able to use my PC PSU pin tool to just remove the black/red leads and then I installed a Noctua NF-A6x25 with the NA-RC12 lead, no soldering required but again my two pin connector is standard fan style unlike yours... cheers
Did the NF A6 fit the screw holes? I was also thinking of it, since when not ordering from Aliexpress directly those small fans cost almost the same as the Noctua would.
And are the screws long enough to still grip into the heatsink?
i did everything like you did and replaced 2 fans when i put it back no sound after a while still makes sounds why ?
On dis/reassembly and while working beware of shorting charge capacitors in the circuitry with metal tools or flesh and thereby damaging the amp or shocking yourself.
My hdfx100 head is making a vibration type noise that gets worse when you tap on the top im thinking something is just loose like a ground or something ? What do you think 🤔 cheers 🍻
Hello m8.
My footswitch input no longer works : whenever I insert a jack cable into it, the amp switches to the clean channel (no matter which channel I have previously selected) turning off the red channel selection led. And there is no way to change the channel when the jack is into it, either manually or by footswitch.
I have to unplug the jack from the footswitch input to get the channel selection to work again (only manually by button of course).
Any tips about this kind of issue?
Evrything inside is fine and nothing is broken / unsoldered. Evry pin connector is correctly plugged in, and previously the footswitch input (and footswitch) worked fine.
I cheked the footswitch too to see if it was a pedal issue, but evrything it's ok with it too. And the problem comes even when I plug a normal jack cable into it.
hello good sir. can u tell me what the white paste is? is it thermal paste and can i use PC thermal paste instead
PC paste is same deal, Arctic Silver, etc... this heatsink isn't doing a lot of work, but it's important all the same
Does the fan turn on as soon as you power up
yes, they run whenever the amps powered up, you can get a MUCH quieter fan, I used a Noctua NF-A6x25 in mine, can't hear it at all unless I'm behind it and very close
can i just disable the fan if i just quietly practice at home?
I would strongly advise not to do that, as it'll cause the amp to overheat with time and damage it.
Install a new fan! I put a Noctua NF-A6x25 in mine
Where can i find the fan please
I used a Noctua NF-A6x25 in mine, any 60x60x25mm will do the job, but the Noctua brand is famous for quiet and reliable fans
Even on its best day, this fan is noisy.
And I finally got around to replacing it. For future folks, if you want lower noise, use a hydraulic bearing fan, lower noise, shorter life. If you’re ok with a little more noise, but want a longer life, use a dual ball bearing one. I’m going to try a lower noise one but the others I’ve had like them only last a year, two at the most.
Agreed! Highly recommend swapping it with a Noctua NF-A6x25 just to quiet it down