Question about Marshall Mg15dfx 15-Watt Combo Guitar Amplifier
My Marshall MG15dfx has no volume on the clean channel. The overdrive channel and the other controls work fine. I was getting a small amount of volume on the clean channel with the amp turned up full, but had to turn the guitar volume up to full to get anything. Any ideas?
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Posted on Jan 02, 2017
I saw this symptom last week on a similar amp. It was due to the reverb tank having come lose and being stuck magnetically to the back of the speaker causing wild feedback as you describe. Worth a look before getting out the soldering iron.
Posted on Jul 18, 2009
SOURCE: marshall mg 100hdfx fan
Some of the Marshall equipment uses computer size fans and even on occasion the same connection.
Take the bad fan with you to a computer repair shop it will be much cheaper than a marshall part they should be able to help you out
Posted on Sep 09, 2009
Testimonial: "that sounds like the best way to do it..will just take fan to computer shop and try and get a replacement...thanks for the assistance"
Try to remove the fan and look for the sticker on the back side where the wires come out.
Remove the sticker, underneath it there will be a small aluminium cap (sometimes there is no cap and the axis is readily visible when you remove the sticker).
Take the cap off with a sharp tool (it shouldn't require a lot of force to do it), now you should be able to see the fan axis being held in place by a small clamp - put a drop or two of machine oil in there, move the fan blades a little to make the oil flow past the axis into the bearing.
Reinstall the cap, put the sticker back in place, reinstall the fan and test it.
Sometimes this will make things better, but if it doesn't then it is only fair to replace the fan.
Posted on Sep 29, 2009
It sounds like your volume control is dirty. You will have to disassemble the amp enough to get access to the volume potentiometer which is soldered to the circuit board. There will be a square hole in it that you can spray some contact cleaner into the control. Use only contact cleaner as anything else could damage the control. Use a small squirt and rotate the shaft. If this doesn't solve the problem you may have to replace the control. While you have it apart, examine the solder side to make sure all the solder joints are perfect especially those on the controls. A bad solder joint can also cause the same problem. Before you take the amp apart unplug the power with the amp on and the volumes turned down. This will discharge the capacitors so it will be safe to work on. I hope this helps.
Posted on Nov 01, 2009
Testimonial: "thx alots, i did try to clean it by blasting air on it, but i just not really sure. i will give another try. thanks for your quickly response. "
Either the control is damaged (happens if they get hit) or it is possible the circuit board it is mounted on has broken solder OR worse, a crack near the control. The unit will require servicing. Parts are readily available.
Posted on Jan 31, 2010
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