Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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No sound Unit turns on and the fan runs but there is no sound at all?

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Guitar amps are not difficult things to use, so if your speaker is properly connected and all the controls are set to allow proper operation, or at least some operation, and it isn't operating, it's a good bet that it needs a trip to a pro audio repair shop.

Posted on Apr 29, 2009

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Mg100fx just stops making sound until its turned off for a few seconds then turned back on


This looks like an overhaeting problem at fiirst glance. This shouldn't happen however. Have you had it long before it started failing? Doe it happen every time you play it, and also at low volume? If so, all I can think of is having it checked out by a technician.

Apr 15, 2014 | Marshall Mg100dfx 100-Watt Combo Guitar...

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Sound keeps turning off after ten muients


I've had this problem with other sound equipment. For me, it was a heat issue and there was an auto shut off feature to save the unit from over heating. I would especially think this is the case if it turns back on without problem after another 10 minutes of being off.

You could try turning off phantom power if it isn't needed to run your mics. Or making sure it is in a spot that allows maximum air flow through the head.

Hope this helps! Don't forget to rate!

Jun 26, 2012 | Phonic Powerpod 740 Plus S715 PA System

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Hi there, I have an american DJ Dekker LED. I plugged it in and put it into Sound active / sound to light mode. I'm getting response to sound because I can hear and see the fan inside the unit...


I have OFTEN found that a cable has come loose. Open the unit and look for such a situation. Also make sure the motion (probably a disc) is working/rotating since with high power LED devices, they have interlocks for safety to keep beams moving.

Jun 24, 2011 | American DJ Supply American Dj Dekker Led...

1 Answer

Peavey 2600 m series shuts off power when turning up volume after about 30 to 40 seconds of playing and takes about 2 minutes to reset


Sounds like the thermal cutout is sensing over temp. Make sure there is FREE airflow around the unit. If it is in a cabinet, install vent fan(s). This amp will throw out a lot of heat. Make sure cooling fins have airflow. Cables can block the airflow... check for that possibility. Repeated thermal cycles will eventually cause failure of components.

Mar 27, 2011 | Peavey Pv 2600 Power Amplifier

1 Answer

The cooling fan on the behringer 500 doesn't work. The fan is good, but the 24Vdc isn't there.


The fan in this is throttled depending on three temperature sensors on heat sinks in the unit... Until the temp is up the voltage will be far less than 24 volts. Two sensors are on the power amp heat sink and another on one of the heatsinks with the IGBT's in the power supply. The fan will run slow and very quiet until unit warms.

Nov 28, 2010 | Behringer Europower Pmp5000 Powered Mixer...

1 Answer

FAN DOESN'T COME ON. FAN IS OK.


The fan in this is throttled and runs quite slow and QUIET until it heats up when driving hard.

There are thermal sensors that command the fan speed... If it doesn't run at all, then take unit to have it serviced... The sensorsare on both the power amp heat sinks and the one sink for one of the IGBT main switchers in the power supply... The problem, if there is one is likely with the transistors that receive the sensor signals and control the fan.

Nov 21, 2010 | Behringer Europower Pmp5000 Powered Mixer...

1 Answer

I have Behringer PMP 3000 2 channels not working fx not working and fan not working but unit turns on ok


Fan speed depends on temp sensors. If doesn't run at all when unit is loaded, take in for repair immediately.

If FX window changes with the control, chances are you have not set the controls properly. You need to havew THREE places turned up for effects: The FX knob in the desired channel(s), The FX slider and finally the knob to send the FX to the mains and/or monitors.

OFTEN the stereo channels aopear to not be working because of the A/B switch between the RCA and 1/4 inch jacks.

You did not give me enough info regarding which channels appear to not work.

Sep 26, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

Is my Behringer Powered Mixer PMP2000 cooling fan suppose to run continuosly. It has a distracting hum in our small church. I don't remember it always running (fan) when we first started using it? Help :-[


Sorry, the fan is thermally controlled and USUALLY will run at low speed when unit is lightly loaded. In hot weather or driven hard it will run faster and louder.

Whatever you do, do NOT block airflow... these are a dual 400 Watt continuous amp (600 a side peak) and they need to breathe !!!

If you can duct cool air to it, that will help. You could also try sound absorbing baffles while maintaining adequate clearance for airflow.

Aug 20, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

I was playing my Marshal 100DFX for about half an hour and when I was done it smelled like burnt electronics. Then I noticed the fan wasn't working. It usually turns on right when I turn the power on. I...


Replace the fan with an IDENTICAL part. Do this before using the unit again.

There is a possibility that the fan is controlled by temperature and the failure is actually with that electronics rather than the fan itself.

May 19, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

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