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I bought a GNX3 from pawn shop, but it doesn't seem to register any input signal coming in to the unit

Made sure my guitar/cords are good. they are sending signal. tried to plug in CD player into CD in/jam along jack.. no signal seems to be getting in. even on the tuning setting.. it says its ready for me to tune the guitar but i hit a string and nothing registers on the machine

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  • Music Master
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You will have to have the system checked out and as it came from a pawn shop it likely is not functional as it is/was

Posted on Dec 11, 2014

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SOURCE: Guitar strings on a mandolin.

By now you may have solved this problem, but maybe this information is still helpful:

What you are essentially recreating is a tenor guitar. Many companies make tenor guitar strings. I would suggest D'Addario J66 80/20 Bronze Tenor Guitar Strings (10-32). I've done this a few times and it is quite fun and makes for an interesting travel guitar.

Have a blast!

Posted on Jan 09, 2009

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SOURCE: "G" string tunning problems,

hi there .... flat means does the string go lower in pitch ...needing the string to be tightend after you have bent it ?
Do you give the strings a real good pull a few times after fitting? this often corrects the problem .... let me know ..as there could be a few other reasons
cheers Pete

Posted on Feb 03, 2009

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SOURCE: LP epiphone 100 "g" string problem,

well, i have this guitar, for me if i bent the string it would pop off the nut, but it went out of tune on me also becuase of the tuners. so i suggest checking the nut to make sure the string sits completely flush in there, and than also just upgrading your tuners if you can and it will be fine. but deffinately upgrading your tuners would stop that hopefully but still could be something with the nut becuase i had both. tuners = machine heads

Posted on Mar 25, 2009

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SOURCE: Peavey 115 Low hum Low volume from input

The preamp section has a problem. It could be anything in the preamp but is OFTEN the input jack itself. They take a lot of abuse.

Also the insert jack contacts that forward the preamp to the power amp if no external FX are used can go bad.

Additional things are circuit board cracks caused by rough handling and also controls that have had the knobs mashed in which can destroy the potentiometers they are connected to.

Posted on Sep 22, 2009

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SOURCE: I just got this guitar. I pull the tuner control,

Are you sure you are struming the G string at the right point? One might be able to fool the tuner by triggering a harmonic on the strings or being too aggressive in the strum.

I would pull the peg and see if the string CAN be tuned manually. It is possible the G string is bad or somebody put the wrong string on there.

Remember that strings can be within about 10% of the breaking tension when in tune.

Also it appears that the thing can detune itself to nearby keys. Make sure you have the dial set correct when you pull it out to tune.

Posted on Feb 06, 2010

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Digitech gnx3 makes cracking noise and the clip indicator comes on when it does


Hi Chris,
This is a discontinued product for the work station. Digitech does have a firmware update on their website. Have you tried that? Other then that, usually a bad guitar cord, dirty input jack or faulty input jack caused the cracking sound. These units sit on the floor where dirt and dust collect. Try spraying the input jack with a good quality conduct cleaner. (Radio Shack?) Make sure your guitar jack is also clean and then "exercise" the input by plugging the cord in and out several times. I am assuming this may help since it is the most simple approach. Otherwise, it may be a component issue and that cannot be addressed via email.

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I bought a GNX3 from pawn shop, but it doesn't seem to register any input signal coming in to the unit


The unit is likley defective and you will need someone to diagnose and fix it, someone who does electronics repair and diagnosis

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I am very new here and don't know how to answer a question to a specific problem so I will write about the most common problems that I have had over the decades doing guitar amp repairs. If you find that your amp is extremely low in volume and then suddenly comes back to normal- check out the effects return [or power amp in] jack. Especially in Marshall amps-these corrode and your signal dies. If there is loud noise such as hissing and crackling with no guitar patch cord in the input jack- the input jack is likely at fault. They normally have switching contacts that ground part of the input circuit when the 1/4 inch male plug is disconnected. When this in is corroded or too weak to make normal contact, you can get these symptoms. If your amp is a solid state Marshall or Fender and there is a random buzzing sound with no guitar signal connected- hit the side of the amp and listen for the buzz to go away or become louder-if it does, this usually means that the connections are loose at the two large filter capacitors. In one or more Marshall amps, they use a filter circuit in the low voltage power supple for the preamp tubes. If you encounter a dead Marshall[the model escapes me now] remove the circuit board and resolder the four connections at the bottom of the bridge rectifier. If you have any other amplifier repair questions you can email me direct at computerlen@hotmail.com.

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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...


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When I plug in my guitar to the Fender Frontman 64R Amp and I just barely move the cord, it make this really loud screeching type noise. It's not an old amp; I got it about five months ago. I can't...


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1) the strings could be too far from the pickups and the instrument needs to be tuned.
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It sounds like the guitar level input to the unit is too low.

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If you have a straight guitar that does not have an amp in it, buy a preamp to first run the guitar through.

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My Tascam CD GT1 mkii guitar trainer is doing everything except when I plug my guitar into the unit, I can not hear my guitar?


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