20 Most Recent Marshall MG10CD 10 Watt Combo Amplifier Questions & Answers

The power supply is blown. Argentina is 220V I believe. I have never seen a power supply schematic for this however being that it is low power it is a linear supply not switching. Either the rectifier diodes are blown out or possibly the output capacitors are blow due to approx double voltage. If you try this yourself be careful otherwise get a new amp. Good Luck

My high pitched noise was due to a resistor not being soldered enough to make a good connection at the back of the input jack.

Hi there.You may have a blown fuse.Unplug the amp then undo the screws that hold it all together.Remove the wires off the speaker and put an AA battery across the speaker connections(of the speaker).You will hear a clicking sound if the speaker is ok.If not then the speaker is blown.This could also damage the circuitry.Check the fuse(s) and replace with exactly the same rating.Assemble and test if still no go then the circuitry is faulty.You could then take it to a repair shop and ask for a quote to repair it.
It might be cheaper to buy a new unit.

The ipod is stereo and the Marshall is mono. You would need to "mix" the left and right channels of the ipod. You could use a simple passive mixer made of two resistors, one from each of the two channels from the IPOD to a single plug for the Marshall. Just joining the two channels without the resistors would have the IPOD outputs fighting each other. You can use 1 K ohm resistors. All parts are available at Radio Shack.

Check for a dry/cracked solder joint where the 1/4 inch phono input jack connects to the printed circuit board. Solid state Marshalls are renowned for this.

Either the button is defective, or there may be bad soldering or a crack in the circuit board where it mounts. You will have to open the unit to repair it.

If you don't find a crack or bad soldering, try to spray a little CRC226 into the switch portion of the button. This is availablle at Home Depot in the electrical department.

TRY CHANGING VOLE CONTROL BUTTON

Usually there are screws, sometimes including those holding the handle that support the amp. Sometimes there are a couple from the sides... USUALLY the corner protector screws are not involved.

Hint, the amp is easier to handle and remove by setting on the side.

Common causes:

Broken input jack.

Blown power amp chip due to overdriving.

Smashed pots due to tipping over or transportation damage.

Blown power supply due to bad power at a venue.

In some cases, grounding the headphone jack can blow amp.

Possible problem with teh switch on the headphone jack wooould be my guess. When you plug in the headphones it opens a switch to disconnect the speaker. Unfortunately, these jacks are weak and often the switch fails to close when the hedphones are unplugged.

You need to open the amp and check if you can close the contact by pressing on it. There are several designs of these jacks and MOST are weak and having a cord plugged in and tripping over it is SURE to break the jack.

Here is a site showing jacks for a Fender, but most are similar.
Look at the one with several strips of metaal between the little black walls... they are NOTORIOUS for the switches not working. OFTEN you can bend the springs tigter to restore them. The site with pix in a box at the top:

http://www.catalinaguitars.com/catalog2/index.php?cPath=66_86

MOST of these small amps are so SIMILAR to the competitors that you can get the users manual for one and use it for another. They are not as the saying goes, "rocket science".

That being said, try for instance the Fender Frontman manual. Here is a site for download:

http://www.manualnguide.com/download/manual-guide/fender-frontman-15g15r-users-manual.html

You will find that even the scematic diagrams are quite similar between the brands. Let's face it, they can't re-engineer much as there is little profit.

MOST of these amps use one of the TDA family of chip audio power amps.

The input or the CD input jacks may have a bad solder joint on the circuit board. If the amp is still under warranty, take it in to be serviced. If not you will have to have someone work on it. If you do it yourself, make absolutely sure there is no power running to it. Also be aware that the filter capacitors in the power supply can retain a dangerous charge. Sometimes you can discharge these by unplugging the amp from the wall power while it is on with the volume very slightly turned up. Once you have the circuit board out, you can wiggle the jacks and see if they feel loose. Look at where they are soldered to the board to see if they need to be resoldered. If that is not the problem then you will need a schematic and some troubleshooting experience and tools. Hope this helps.

First of all I would call the radio station and let the know that there over modulating just a bit.this has happened to me a few times even on my tel/phone. I use to get WOKO on my amp. You can try and move the amp to diffrent location , reverce the polarty switch on the back , not much more you can do. But watch out when you here music comming from you toster your in big trouble, just kidding. Good luck DFD