Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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Buzzing fan on a Marshall mg 100 head

My marshall mg 100 head has a cooling fan that buzzes for about 60 seconds when I turn it on, then the buzz goes away. Can I order a new fan?

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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

Posted on Sep 29, 2009

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You can order a new fan direct from marshall ... but the fan will be probably be ok for a long time ...

Posted on Sep 28, 2009

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Check that there is no foreign object such as a wire or shard of paper touching the blades. Often this "blows away" and the fan will be quiet.

The second possibility is that the fan bearings are a bit dry. Usually this means replacing the fan eventually. It is best to use an identical fan regarding the voltage and current rating and general design/size.

A third possibility is if the fan is thermally controlled, these SOMETIMES are noisy due to the electronics controlling the speed pulsing the power to the fan. Not much you can do about this.

I would just make sure fan continues to operate. A fatal failure mode of fans is when they accelerate up for a few seconds and then "shudder" to a near stop while making a rattling noise and then accelerate again. Those MUST be replaced immediately.

Posted on Sep 25, 2009

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