Question about Marshall MG100HDFX 100-Watt Amplifier Head
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Posted on Jan 02, 2017
Here is the schematic:http://www.ampix.org/albums/userpics/10003/MArshall_MG100DFX.pdf There are a few possibilities.The jack for the footswitch for channel changing JS1 might be faulty. Zener diodes 1 and/or 2 might be faulty. Switch 2 may be defective. TR1 might be defective. IC 4 or 5 might be defective.Start with the channel switching circuitry testing in the order I gave you. Check the actual clean channel circuitry to see if you actually have a clean channel anymore. Before you do any of this make sure you know enough about troubleshooting and have at least a good VOM and are familiar with safety procedures. The filter capacitors in this amp store enough charge to kill you. A cheat to partially discharge them without damaging the amp is to unplug it from the wall while it is hooked up to the speaker cab you are using while it is on at a very low volume with a guitar cord plugged in. Make sure you use exact replacement parts if you tackle this. They don't have to be from Marshall, they just have to be exact electronic equivalents from a quality manufacturer installed correctly. I would recommend that if you have no experience or are at all unsure of the repair to take it to a Marshall dealer to have it done. Please rate me if this helps.
Posted on Nov 29, 2009
The digital effects operate from the +5 volt supply so verify it is correct. The effects appear to be on a card, verify it is seated in its slot propely.
Posted on Apr 23, 2011
SOURCE: Bought amp with no footswitch
The schematic shows it as a standard 1/4 inch stereo plug. Wire the ground common to both switches (Channel and DFX), the ring to one switch and the tip to the other...I.E. ground (sleeve) to ring for one switch and ground to tip for the other. You'll have to experiment with which switch operates what function and label them accordingly.
Posted on Nov 02, 2012
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