Question about Marshall MG100HDFX 100-Watt Amplifier Head

Open Question

My Marshall MG100HDFX works fine, but on the footswitch, only the Clean/overdrive button works. The OD1/OD2 button does nothing. I've checked the pedal wiring and it's fine, and checked that the foots

Footswitch problem.

Posted by on

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to an Expert (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 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

Ad
  • 1138 Answers

SOURCE: My problem is that the clean channel doesn't work.

Here is the schematic:http://www.ampix.org/albums/userpics/10003/MArshall_MG100DFX.pdf There are a few possibilities.The jack for the footswitch for channel changing JS1 might be faulty. Zener diodes 1 and/or 2 might be faulty. Switch 2 may be defective. TR1 might be defective. IC 4 or 5 might be defective.Start with the channel switching circuitry testing in the order I gave you. Check the actual clean channel circuitry to see if you actually have a clean channel anymore. Before you do any of this make sure you know enough about troubleshooting and have at least a good VOM and are familiar with safety procedures. The filter capacitors in this amp store enough charge to kill you. A cheat to partially discharge them without damaging the amp is to unplug it from the wall while it is hooked up to the speaker cab you are using while it is on at a very low volume with a guitar cord plugged in. Make sure you use exact replacement parts if you tackle this. They don't have to be from Marshall, they just have to be exact electronic equivalents from a quality manufacturer installed correctly. I would recommend that if you have no experience or are at all unsure of the repair to take it to a Marshall dealer to have it done. Please rate me if this helps.

Posted on Nov 29, 2009

  • 5603 Answers

SOURCE: Marshall MG100HDFX - Digital effects just stopped

The digital effects operate from the +5 volt supply so verify it is correct. The effects appear to be on a card, verify it is seated in its slot propely.

Posted on Apr 23, 2011

sg1972
  • 225 Answers

SOURCE: Bought amp with no footswitch

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.

Posted on Nov 02, 2012

sg1972
  • 225 Answers

SOURCE: wiring diagram marshall mg100fdx footswitch

Using a standard 1/4 inch stereo plug....Ground (sleeve) to tip for one switch and ground to ring for the other.

Posted on Nov 02, 2012

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

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!

Jan 16, 2017 | Marshall Music

1 Answer

Marshall troubleshoot


First check the preamp valve in that curcuit

Feb 26, 2014 | Marshall Amplification Music

1 Answer

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


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.

Oct 25, 2012 | Music

1 Answer

On the MG30FX, it wont stay in overdrive sometimes. I push the switch in, then it will go back to clean automatically.


There is a possibilty that switch contacts on the footswitch jack are dirty if you are NOT using the footswitch. If you ARE using the footswitch, then an intermittent cable or static charge build up may be causing this.

Aug 06, 2011 | Marshall Amplification Marshall MG30FX

1 Answer

Marshall jvm 410h i'm getting loads of feedback when i use od1 or od2 orange or red mode


Dampen the strings of your guitar. If feedback disappears, then you need to move the amp so it can't resonate the strings of the guitar. OD1 and OD2 WORSEN the chances of the feedback into the strings. When this occurs you can often see the strings vibrating without the player picking them.

Nov 22, 2010 | Marshall Amplification Marshall JVM Guitar...

1 Answer

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

Dec 30, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

3 Answers

My problem is that the clean channel doesn't work. The OD1/OD2 channel works just fine but I'm not getting any sound out of the clean channel... any ideas?


Here is the schematic:http://www.ampix.org/albums/userpics/10003/MArshall_MG100DFX.pdf There are a few possibilities.The jack for the footswitch for channel changing JS1 might be faulty. Zener diodes 1 and/or 2 might be faulty. Switch 2 may be defective. TR1 might be defective. IC 4 or 5 might be defective.Start with the channel switching circuitry testing in the order I gave you. Check the actual clean channel circuitry to see if you actually have a clean channel anymore. Before you do any of this make sure you know enough about troubleshooting and have at least a good VOM and are familiar with safety procedures. The filter capacitors in this amp store enough charge to kill you. A cheat to partially discharge them without damaging the amp is to unplug it from the wall while it is hooked up to the speaker cab you are using while it is on at a very low volume with a guitar cord plugged in. Make sure you use exact replacement parts if you tackle this. They don't have to be from Marshall, they just have to be exact electronic equivalents from a quality manufacturer installed correctly. I would recommend that if you have no experience or are at all unsure of the repair to take it to a Marshall dealer to have it done. Please rate me if this helps.

Nov 29, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

3 Answers

Marshall mg100hdfx loud fuzz and distortion and no guitar sound


Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.

Jun 25, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

Not finding what you are looking for?
Marshall MG100HDFX 100-Watt Amplifier Head Logo

Related Topics:

42 people viewed this question

Ask a Question

Usually answered in minutes!

Top Marshall Music Experts

Michial Gueffroy

Level 3 Expert

1138 Answers

matt martin
matt martin

Level 3 Expert

1213 Answers

Leonard Jeffrey

Level 1 Expert

6 Answers

Are you a Marshall Music Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...