Question about Marshall Amplification Marshall MG15FX Guitar Combo Amplifier - 8 Inch, 15 Watts

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The amp does not work at all even though the lights on the amp come on but when i connect it to the guitar no sound whatsoevva i checked the sound nobs on the guitar and the amp n all r ok but no soun

No sound even when the amp n its settings are completly fine

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Have you checked a different cable?. Also, when you plug in the unit, there should be a "pop" if everything is turned on. If there isn't, the connection is bad someplace.

Posted on Aug 07, 2012

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Posted on Jan 02, 2017

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SOURCE: My Marshall Guitar amplifier Makes Noise From

the "nobs" that have the noise is what we call a "dirty pot" Some can be cleaned others are to far gone to ever work well again. To clean a "dirty pot" you need to get into the internal area of the amplifier. Most amps have screws in the bottom that hold the unit into the wood frame. unplug everthing from the amp. turn the unit upside down and remove the retaining screws. that should allow the guts" of the unit to slide out. don't force anything. then you should be able to see the "pot" from the top. If you can you get electric contact cleaner (I use the NAPA brand) and the spray stick (red tube) that comes with the can of contact cleaner. In a safe area (no flame or heat) you spray the contact cleaner on the top and sides of the "pot" then work the knob back and forth all the w ay to each end of the allowable movement but never try to go beyond where the knob wants to stop. repeat this at least three times. take care not to let the contact cleaner drip onto anything as it could leave a stain. I usually try to use a lot of newspaper under the unit and be careful not to use any more spray than you need. You should feel the pot getting easy to move as it gets cleaner. Let everytthing dry off before you reinstall the amp into the outside frame. Move slowly and take your time. If it works it will save you a lot of repair cost as changing out the pots is not fun and could cost almost as much as the amp is worth

Posted on Apr 20, 2011

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1 Answer

No sound when connect guitar


have you checked the speaker leads in the back to make sure they are hooked up> if so, you have power to amp? Volume knob turned up? is guitar cord good? (try it in a different amp , or check w/ an ohm meter) . Does the guiter have active pick-ups? If so, is battery good? and last, is the volume knob on guitar up" try all that and get back to me

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1 Answer

No sound


This is not a powered mixer and so you must connect a power amp to the "line level" outputs of the mixer. Other "no output" problems could be related to buss assignments and other signal routing issues. Check for output by connecting "Main Out" left or right to a guitar amp input instead BUT turn all volumes down to zero before conductiong this test as guitar amps are designed for "Microphone" level inputs. Owners and Hookup manuals can be found here...

http://www.mackie.com/products/1604vlz3/

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Acx1800 no bass very small volume, brand new amp.how do i put my speakers in phase?


If you are sure that the input device (I'm assuming electro-acoustic guitar) is working properly then it sounds like a clear case for return to the vendor! If it is brand new then don't even try to repair it. The phase buttons on the guitar channel are to help reduce feedback by putting the body of the guitar out of phase with the speakers. The speakers should all be in phase with each other though.

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My deville has just stopped producing any sound what soever. All the tubes glow and the red power light is on but no sound. I have tapped the sides of all the tubes and they all register a sound except the...


The first thing i would do is not leave it on in this way for too long. You could blow out a very expensive Transformer if its a faulty speaker. The worst thing you could do to a TUBE amp is run it without a speaker . I would test the speaker first. Just remove the wires going to it. And connect the speaker to either a car stereo or house system at low volume very low. And see what you get. if it works ? Good! Now check your guitar chord/wire. Try different ones try different guitars. If that doesn't work . Look into the input jack on the instrument input hack on the amp.. They do come loose off the board.Either get a new input jack or resolder the old one. if you only have one guitar look at the guitar output jack. Loose wiring on the guitar could cause this also. Dirty In and out put jacks could cause this. A pencil with Very fine sand paper wrapped around it will clean a dirty input/output jack. Try these things. Just remember poking around your amp is Dangerous. The electrical components hold a charge even unplugged that can kill you. No joke..

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3 Answers

My line 6 spider III 15 watt amp isnt working properly. i turn it on but i get this sound when its connected to the guitar. it sounds like when a guitar is not connected to a guitar and the guitar cable is...


While it could be true that you're having a problem with the guitar or cable as the previouse expert suggested, to say that it can't be anything else is false. It could be a jack problem...it would only be apparant when the jack is making contact with a cable. I do think you should test it with another guitar and another cable but if that is not solving the problem then I bet it's a problem with the input jack of the amo itself or even one of the ionternal components (this is a digital amp and there are MANY components and settings that can trigger a problem like this) If the problem is not solved with a new cable/guitar configuration then it's time to take it to the shop.

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1 Answer

No sound


You would NOT use a stereo cable to plug in your guitar.

The stereo cable would carry the battery voltage back to the amp and MAYBE cause the fuse to blow.

You use a MONO instrument cable for your guitar.

The ring connection is use to complete the circuit to turn on the battery in most guitars.

Replace the fuse ONCE and get the proper instrument cable (NOT consumer audio cable) for your guitar.

If fuse blows again, take amp to shop for service.

May 30, 2010 | Peavey Valveking Head

1 Answer

I can turn it on and i hear the fan going...but it doesnt make any sound when i strum or anything...please help!


There are some basic things you can try before you suspect the amp. Does your guitar cord work in another amp? Is your guitar sending sound through your guitar cord? Without any thing plugged into your amp can you hear a slight hiss when you turn your controls up on your amp? Here is a link to some things you can do to troubleshoot the problem:http://www.geofex.com/ampdbug/ampdebug.htm Even though the info is for tube amps a lot of it also applies to solid state (transistor) amps like yours.If it turns out to be the amp and you don't feel comfortable working on it and have no one that you know personally to do it you are best served by taking it to a certified Marshall repairman who will have the tools, parts and schematics to help you.

Apr 18, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

NO sound through the AMP even though the power light comes on


Not a fuse. First thing, to check your speaker (amp unplugged, of course), touch the + and - speaker connections to a 9V battery. If you don't hear a pop sound then your speaker is blown. Thus, no output sound. If speaker is OK, then the output IC is your problem.

Jul 12, 2009 | Music

3 Answers

Not getting enough distortion(esp ltd ax-260)


Hi,

It's not your pickups. It would be nearly impossible to loosen a wire inside of your guitar by having even heavier than your amp head drop on it. It is most likely your volume pot. The post, if hit hard enough, can virtually distroy your pots. Another possibility could be your jack, al though considering where it's located on your guitar, it would be very hard to damage it by having something drop onto it.

There is little else that could be the problem. Hopefully you didn't damage your guitar too badly. If the guitar was in front of me, it would be a relatively easy diagnosis.

Fortunately, volume and tone pots are inexpensive, and if you're handy with a soldering iron (or you have a friend that is) it is an easy install with four to six solder points, depending on your configuration. I don't want to assume it's a stock setup, but when you take off the rear electronics cover, you will immediately see what configuration you have.

If you have possibly damaged the pickup bobbins (assuming you have the stock humbuckers in your guitar), you would be able to see the damage, It would either look damaged,or work correctly. As you know bobbuns are simply wound wire, and that's not easy to damage. Plus your strings provide a minimal amount of protection, unless your amp head slammed it very hard. Start by replacing the volume pot. Cheapest parts first. There is no way to test the pot with anything like a potentiometer, because there is virtually no voltage that passes through the pot. Additionally, unless you have active pickups, your pickups cannot be either. If you do have to replace your electronics, you can find a large variety and even upgrade your parts by searching eBay. The good thing is that you havce a guitar, and guitar parts are abundant, relatively cheap, and most people change out electronics just to achieve a different sound.

If you are so inclined, most good guitar shops will diagnose your problem for cheap and apply the cost of the diagnosis to the cost of the repair. Good luck, and I hope I have given you some information to work with.

Thank you for using FixYa

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