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MY Marshall JCM 2000 100Watt head is quiet TURNED fully on stand by OFF and ready to plug guitar into the INPUT Jack. Soon as I plug into the INPUT Jack cracking noise hissing noise.

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I would suspect a bad cable. Also, these symptoms show up if you mistakenly use a speaker cable (unsheided) as a guitar cable (shielded).

Posted on Dec 13, 2016

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Marshall JCM 2000 cracking hissing noise only when I plug into it. INPUT Jack ? Or FX jacks. ?


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Marshall mg100hdfx head. I get no sound whatsoever plugged into the guitar input but the controls seem to work as I can hear changes in the light ambient static. I will get sound however if I plug directly...


You MAY have a broken input jack. If you can hear changes from the overdrive gain control, that control is just one stage away from the input jack. Also there is a capacitor C60 that is for RF bypassing and if that shorts that will kill the audio. Yes, inout jacks get destroyed by tripping over guitar cables... that is why you run the cord through the amp handle before plugging it in. Of course verify your guitar and cable is good using another amp.

Aug 30, 2011 | Music

1 Answer

I have a marshall JCM 900 when I plug in my foot switch and try to play it pops and cracks .I know it's not the foot switch or my guitar.I checked the tubes they look alright so what part is broke in my...


I doubt that you have checked the tubes... tube checker's are rarity now and you can't look at a tube and "tell it is alright". If you leave the footswitch out does it do the same thing?
The probllem could be many things...and you haven't mentioned how you tested the items you are exhonorating. A common problem is a noisy or broken INPUT jack. Musicians forget to loop the guitar cord through the handle and the cord gets moved and yanked sideways wearing the jack and often breaking internal parts. Yjos also goes for the cord to the footswitch as well. Cords and connectors/jacks are the common problems. Less common but frequent are damaged volume control pots due to damage when handling... including broken solder where these attach to the circuit boards.

Feb 11, 2011 | Marshall Amplification Marshall JCM800...

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Hi There, i have a Marshall MG100 DFX Series Guitar Combo Amp,and when i plug my guitar in i get verry little,or no sound from the guitar imput,can you please help. Thank you.


Try exceriszing the connections for input and headphone jacks ( just be inserting qtr inch connector in/out of jack ) a few times. then plug back into your input. if that didn't solve anything while amp is on move the input jack around ( up, down, left, right, ) and see if this makes the signal cut in/out to normal playing. if so you just have broken solder connections on the jack. Also you may just want to test your Speaker to make sure no problems exise there. ( Voltmeter across + and - terminals ) prolly 8 ohms but will most likely state on woofer. if not of this fixes your problem let me know and i'll throw some more steps your way.

Jan 24, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

I was given a Marshall MG Series 15 DXF guitar amp. The input jack has been twisted off and broken out of the circuit board. I would like a diagram of this part of the circuit. OR Is this soldered to...


Typically these input jacks have 3 or 4 "tails" that solder to the circuit board. The best thing is to get an exact matching jack. You can search for 1/4 inch jacks with matching profile at Digikey.com, Mouser.com, and try www.tubesandmore.com/

In the future ALWAYS loop the guitar cord through the handle so plug is not yanked sideways when people trip over the cord.

Dec 14, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Hi. I've had this transistor Marshall head for about a year now but lately whenever I plug a patch cord in the input jack and turn the amp on, I get crazy amount of distortion. I know this only a problem...


A educated guess points to either broken soldering or a broken ground on the input jack itself. This is a CHRONIC problem of amps because people trip over the cord and it yanks the cable and jack sideways breaking it or the solder where it attaches to the circuitry.

To avoid the problem, loop your cable through the handle of the amp so when cable is yanked it doesn't yank the jack so hard.

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1 Answer

Hiwhat is the best way to connect my DigiTech RP10 to my Marshall MA100H Guitar Amplifier


Read your manuals for both pieces of gear carefully first. You only have one amp so you won't be able to take advantage of all the FX on the Digitech as a lot of them are designed for stereo. The Digitech manual shows guitar into the Digitech and output from the Digitech into input of any guitar amp. Since you have a Marshall and can already get some great sounds by running your guitar straight into the Marshalls input, you would probably be better off using your Digitech in the FX loop. Run a guitar cord out of the send on the loop into the input of the Digitech and a guitar cord out of the left / mono output jack on the Digitech into the effects return jack on the Marshall. Start out with the effects level on the Marshall all the way down. Do the same with the Digitech with both the input and output levels. (Read the manual carefully) I think the choice of the Digitech isn't that great because it is already trying to reproduce a lot of what you can already get with just your Marshall but with a little experimentation and some careful adjustments you should be able to add to the sound of the Marshall. Hope this helps.

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1 Answer

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


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.

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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.

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