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I have a Marshall mg100hdfx Head & Cab - The clean channel is on but when i hit the footswitch it is not changing to overdrive channel - please help

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Sounds like either your "front-panel" switches are not set for channel switching or the footswitch's mechanical "Channel" switch is defective. According to the OM the "Channel Select Switch" on the front becomes inactive with the footswitch plugged in.

If disconnecting the footswitch causes this front-panel switch to operate properly then it has to be your mechanical switch in the footswitch. Repair of these footswitches are pretty simple provided you find a replacement and have soldering abilities.

Posted on Nov 01, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

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cpt_cavman
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SOURCE: marshall mg50dfx was working great

please check the speaker leads in the back near the edge of the driver (the heavy metal part I think theres 2 in that cabinet )

Posted on May 18, 2009

  • 62 Answers

SOURCE: schematic ?

Hello

This will help you

http://www.guitartrader.com/!OL10BXPVIk3X3pt0Y2E!BQ!/Marshall-MG100HDFX-100-Watt-Amp-Head

Thanks & Regards

Posted on May 24, 2009

bob_computer
  • 3153 Answers

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

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"

  • 5603 Answers

SOURCE: replacement speaker amplifier in my marshall mg100hdfx head

Yes. You can get them from Mouser electronics at $3.42 in singles.

http://mouser.com/Search/Refine.aspx?Keyword=TDA7293

Posted on Nov 11, 2009

  • 5603 Answers

SOURCE: Fender Hot Rod Deluxe Footswitch

Main thing to verify is that the particular footswitch and cable you have is specifically for that amp. If it is not the right one, that is your problem as there is very little compatibility among footswitches.
Looking at the schematic, plugging in JUST the cable shifts operation as you observed. This uses a crazy circuit in which AC is applied on the cable and the footswitch has a diode each direction that causes the amp to shift between the states. when you plug a bare cable in, it disconnects the internal diodes and switches for control at the amp, hence the signals float.
You should investigate the footswitch to make sure it is the right type with the diodes resistors and caps that is for the Fender Deluxe.

You can find the schematic for the amp here:

http://www.fender.com/support/amp_schematics/pdfs/Hot_Rod_Deluxe_Schematic.pdf

Look at the circuitry of the switches on the schematic at C8. Your pedal should have similar circuitry. Assuming your cable is good, the problem would be in the pedal itself.

Posted on Jan 02, 2010

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1 Answer

Marshall MG100HDFX footswitch toggling - bypassing?


I once used uART & some latches to decode & hold the difference between "odd & even" midi program changes. Then used the output to switch a relay in a twin necked guitar to change between necks as it were in response to a midi pedal. Perhaps you could do something similar? Else get a Studiomaster MA-36 midi analyser & hack into it to use one piece of midi data (from across an LED?) to switch channels on your amp? Good Luck!

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The schematic shows it as a standard 1/4 inch stereo plug. Wire the ground common to both switches (Channel and DFX), the ring to one switch and the tip to the other...I.E. ground (sleeve) to ring for one switch and ground to tip for the other. You'll have to experiment with which switch operates what function and label them accordingly.

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When I plug my P803 2 Way footswitch into my Haze40 amp the effects light flashes and the footswitch will not change channels or effects.


The P803 is designed to work with the "Valvestate" and Tube amps. I don't think it is compatible with the Haze40 since they have an optional 4 button footswitch so the optional one would necessitate different interface than the P803.

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I have 2 marshall mg100hdfx heads, i want to run them together, how do i wire them?


You have to use seperate speakers for each. These are not designed for any form of "bridged" operation.
You would have to wye the inouts from your source.

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I have a MG100HDFX head, with the cabinet that came with it and the other I plugged in, the amp sounded fine for about 5mins while i was warming up. Then it started to fade in and out with a very fuzzy...


I would first suspect the head... try driving a different speaker to isolate which is at fault.

If unit starts working when cooled down, it may be going into thermal protection due to any of several causes including a defect or overdriving it.

Nov 15, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

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My 100hdfx has a problem switching channels. Both overdrive channels work fine but the clean channel is none existant. If you switch it to the clean channel and turn it up all the way you can faintly here...


have you tried the footswitch to change channels. also. my amp has to be in channel 2 position (with the button on the head) before i can use the footswitch. sometimes the input/footswitch jack wears out and you need to bend the internal tip/ring tabs of the jack to make better contact. also like on my fender amp, i had just a standard mono instrument cable going to my footswitch and it was acting wierd cause it needed a stereo instrument cable. one last thing on the grounding resistors on the pcb, they get hot and break the solder welds which messes with all sorts of stuff in amps. usually look like sugar cubes , cement resistor. 5watt usually under 1k ohm. check for bad solder welds on the pcb where the big resistors are and the switches/buttons and at the footswitch. there may be a bad ic or transistor for the channel swithing

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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.

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