Question about Marshall MG100HDFX 100-Watt Amplifier Head

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I plug my input in and my guitar wont play on the amp unless i wiggle the cord and unplug it and plug it back in a million times

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The input jack is likely broken... a COMMON problem.

To avoid this in the future, loop your guitar cable through the handle so when cord is yanked it doesn't break the jack by yanking it sideways.

Posted on Sep 12, 2010

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Hi my zoom g1x fx is having some sound issues,it creates unpleasant noises and the sound kinda fades. I noticed the fading of the sound when i'm picking the thinner strings but it sounds so loud on the...


Hello I have this pedal too and have experienced similar problems..
If you are using battery power only use Duracell Ultra (or equivalent) never re-chargeable batteries. However I am assuming you are using the mains power adapter rather than batteries.
Start by eliminating external issues. Change your guitar lead and output lead - if you don't have spares swap them over or swap the ends round to make sure it is not a contact issue in the jack sockets.
I found this problem occurred most often when I was using headphones plugged directly into the pedal rather than an amp. I was usually able to solve it by wiggling the output jack plug slightly so came to the conclusion that it was just a poor quality plug or socket.
Having said that I think that there might be a bug in the processor unit itself because I have occasionally experienced the problem when playing through an amp. I resolved it by unplugging everything and starting again but this is a bit annoying either during a gig or half way through a recording session.
Does it do it on every patch or only on some? I have one patch that is completely clean (straight through) with no effects, noise reduction, boost, with the tone set at flat. You could try setting a patch like that up as a comparison and see if it still does it.
Lastly you could try recalibrating the expression pedal.
  1. Unplug the input jack to turn the unit off.
  2. Hold down the pedal assign button whilst plugging the input jack back in.
  3. The display should read 'dn'
  4. Raise the pedal fully and press the store key
  5. The display now reads 'UP'
  6. Push the pedal fully down to the stop and then release it (it will return slightly)
  7. Press the store key again
  8. Job done (unless the display reads 'Er' - in which case repeat from step 4)

Jan 30, 2011 | Zoom G1x Guitar Multi Effects Pedal with...

1 Answer

1) how to make my amp record....because its not working when i try... 2) do i have to a cord in line 1 and 2??? 3) do i have to plug in the cord in :.....line in or line out??????


You will use microphone with balanced XLR connector into the XLR mic input. Note, the ALpha does NOT have phantom power so you cannot use condenser mics.

A guitar can be plugged into the hi-z instrument 1/4 inch jack on the left front of the unit.

To use the line 1/4 inch inputs you will use BALANCED TRS 1/4 inch cables from your source.for these channels. The level on these needs to be line level.

The line outs are for sending audio out to an amp. There appears to be RCA outputs you can use as well.

I am not sure what you mean by making your "amp record"... An amp PLAYS the audio, usually into a speaker.

If you are trying to play a guitar through your amp AND record, then you will connect your guitar to the Alpha, the amp input will have a cable from say Line 1 OUTPUT and when recording wou will have the echo feature on so your guitar is passed through to the amp.

Jan 09, 2011 | Lexicon Alpha Personal Recording Studio

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My warlock makes this horrible noise as i plug in the cord. I don' have ANY idea why. I've been messing around with it and still nothing has worked out. It makes the sound as if my amp is turned all the...


If the noise is a pop or click, that's normal. Any other sound could be caused by too long a cord, which will produce noise while on the floor.

If it's not the cord, then you most likely have something wrong with the wiring inside the guitar. Have a luthier (guitar builder and technician) look at it, and s/he should be able to fix the problem.


Hope that helps!

Nov 21, 2010 | B.C. Rich Nt Warlock Electric Guitar

2 Answers

My guitar was playing fine yesterday but when i plugged it in after my friend's bass guitar was using the same amp, my guitar got this feedback from the amp. I cant stop it and it's very problematic.


First of all I suggest that you try your guitar through another amp you know works without the feedback. There is a very slim chance there is something wrong with your guitar but I would say no. You didn't mention what kind of amp you have: solid state, tube or hybrid. It would help if you tell us what brand and model number your amp is. Try setting your amps controls the way you usually have them and using a long cord that works properly, isolate your guitar by putting it in a room with the door closed by running the cord under the door. Is the feedback still there? Try playing with your back to the amplifier. Is the feedback still there? You need to identify the problem. Is it your guitar or is it the amp? Here is a link to tube amp troubleshooting:http://www.geofex.com/ampdbug/ampdebug.htm Here is a link to guitar feedback causes:http://www.guitarsite.com/discussion/messages/23765.shtml If you decide it is your guitar you can have a look for broken solder joints etc. There are wiring diagrams on the internet. If it is your amplifier, you should take it in to be serviced. Take it to a dealer that carries and services that brand. Unless you have all the tools, a schematic and electronic troubleshooting experience you are in danger of injuring or killing yourself or making the problem worse. Hope this helps.

Nov 07, 2010 | Dean Guitars Dean Ml Xm Electric Guitar

1 Answer

Loosing volumen and a high noise expecting when trying to play concern like a gorund problem or some thig like that the amp is 4 yrs old


Often a broken input jack is the problem causing this. Wiggle the cord plug when it occurs to see if that might be the problem.

Also tweek the controls slightly to see if you can get a change in the problem when it occurs.

Apr 17, 2010 | Line 6 Spider Iii 15 Modeling Guitar...

1 Answer

I have a spider III 15W amp that has worked for a year. plugged in last night and it's getting power but no sound. Not even a hum from the speaker. checked everything and it's definitely the amp....


Try disconnecting the speaker from the amp with the amp unplugged from your power. Never work on an amp when its plugged in unless you know how dangerous it is. Check for resistance across the speaker terminals with a volt ohm meter to see if you have a blown speaker. Thats the first thing to look for. You should here a hiss or a low hum when your amp is on and you plug a guitar cord into the input without the guitar. Check those two things first.

Jul 15, 2009 | Line 6 Spider Iii 15 Modeling Guitar...

2 Answers

Static Noise from guitar amp.


I take it you have made sure that both the cable to the distortion box from the guitar and the cable to the amp are both good. From the description you give, it sounds like there is no signal getting to the pedal. If the cable is good, then the next likely suspect would be the input jack on the fuzz box. Try wiggling it a little with the guitar cable in place to see if it is loose. Some input jacks are unbelievably cheap and flimsy. A crackling sound (static like) is almost always a bad connection. If it was the output jack, I would think that the guitar signal would come through a least a little bit, but you might want to try wiggling that one, too, if the input jack isn't the culprit.

Another possibility to check is the battery, but this doesn't seem as likely. Some effects units devour batteries, especially units that use 9V batteries. I have a multi effect pedal that kills a 9V in about an hour.

Jan 22, 2009 | Epiphone Les Paul Studio Electric Guitar

4 Answers

Loud buzzing when amp connects to guitar


Is there a loose connection anywhere?

Jan 03, 2009 | Music

2 Answers

Electric Guitar wont play through Amp


the buzzing is indicative of an open ground connection, check the cord by substitution or with an ohm meter, if the cord is good look at the connections to the jack inside the amp ( im guessing you built the amp from a kit). Is this a solid state amplifier? Tube amps have lethal votages and should not be experimented on without knowledge of electronic safety. Also if there is more than one input to the amp try plugging the guitar into another one and see if its still the same.

Dec 30, 2008 | Yamaha Electric Guitar

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