Question about Music
Jumper the power amp in jack to the preamp out jack [or effects send jack to the effects return jack]. There may only be oxidation in the contacts of these jacks. If the normal sound level comes back-either clean the two jacks or have them replaced.
Posted on Nov 23, 2014
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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
Play around with your placement and where you are compared to the amp. I have a line 6 spider jam and I was getting pissed everytime I went into guitar center b/c theirs had more bass than mine. Then I realized that I put the amp beside me when I play but I play infront and over it when I go there. Have you ever noticed how much gain you lose when you take it outside compared to in your room. I would just look up the owners manual and see if you are missing anything. Check the fuse in the back too. If you clean isnt "that" clean and your overdrive is sucking then maybe the fuse is on its way out. Only $1 problem though. good luck
Posted on May 25, 2010
SOURCE: marshall jvm 410h i'm getting
Dampen the strings of your guitar. If feedback disappears, then you need to move the amp so it can't resonate the strings of the guitar. OD1 and OD2 WORSEN the chances of the feedback into the strings. When this occurs you can often see the strings vibrating without the player picking them.
Posted on Nov 23, 2010
I would think the other way, IF you hear fuzz or hear anything at all, your input is fine, wiggle the speaker plug around and listen for changes. You probably have a dirty socket on SPEAKER OUTPUT.
Posted on Mar 08, 2013
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