Question about Marshall Amplification Marshall MG15CD 2-Channel 15-Watt Guitar Amp

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Both the gain and volume pots on the overdrive channel have poor connections and crackle and cut out a lot when turning. They also cut the sound intermittantly when playing and require a jiggle or a tap to restore sound. How do I go about fixing this?

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Dirty contacts inside the potentiometers (variable resistor knobs) cause this.
The cheap quick way to help this is to work the pots back and fourth a bunch of times, this will scrape away some of the oxidation and dust on the contacts.
The mid term way to fix this is to use a electrical contact cleaner like Deoxit. This must be able to get inside the pots so some disassembly of the device may be necessary to get to the back of the pots and spray or pour the cleaner into the pots and then work them back and fourth.
A long term way to fix is to actually desolder and replace the pots with new ones of the same size, value and taper.

Posted on Mar 05, 2015

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Stop by Guitar Center and they carry spray product(s) made for cleaning "pots" IE: Blue magic, etc...

Posted on Apr 06, 2011

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Posted on Jan 02, 2017

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I'm not sure about channels 12 and 16, but channels 6 and 9 seem like having some loose solder contacts, which usually occur with long term use - you need to remove the problematic channel strips and check the solder contacts on any of the pots / switches / connectors that protrude through the top panel - resolder any loose or bad solder contacts (i usually resolder ALL pins on ALL connectors, pots and switches just to be sure).

As for the lower gain on CH12 - see if the mixing slider is connected via wires, if so, compare it to the connections on other channels, see if there is a loose wire or if the wires are connected in a wrong way (i had a "lower gain" issue with a mixer once that turned out to be a wrongly connected mixing slider - i obviously wasn't the first person to repair that mixer...)

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Hope some of this helps...

regards

3rq8 (Triarcuate)

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