Power switches are pretty easy to replace, i have the mgdfx50 and its only 4 spade connectors, 2 blue and two brown, doesnt have to be a marshall, just a 4 pole switch from an electronics store
SOURCE: 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
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"
SOURCE: 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
SOURCE: marshall md hdfx100 vol. cut
a bad solder weld on a reverb pot can cut the volume.. you need to check the solder welds on all the pots and jacks. then move on to the grounding resistors, they look like sugar cubes, and are usually 300-500 ohm 3-5watt. those usually have cold solder welds and need to be resoldered. you can email me thru my website yostamplifier.com if you need further assistance. from there i will look into the schematics and help you fix your amp....via email.
SOURCE: Marshall MG100 MG DFX. Full speaker noise with all
well theres only 3 sections of the amp the problem can be in. Pre-amp, Power amp, or speaker. First Unhook the speaker. If you can turn on the amp after that and hear your guitar through the headphone jack this means your pre-amp is ok. at that point you can just take a voltmeter across the 2 terminals of the speaker to see if oyu have 4, 8, or 16 ohms. that'll prove the speakr is good. I'd also try to connect and disconnect the pedal a few times to see if the normals in the jack on the amp are just being stupid. if all this concludes no success, you sir have a power problem.
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