Question about Marshall MG100HDFX 100-Watt Amplifier Head

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Pilot light is on but there's no output. Have looked inside +the fuse is okay and no components look to be fried !

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This is not a user serviceable issue. It needs to go to the shop

Posted on Apr 29, 2015

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You might need to take it to a retailer that has guitar equipment they should be able to solve your problem or have your answer

Posted on Apr 28, 2015

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1 Answer

No input level and no audio


The problem is that it may not have 'just' been the fuse that blew. Sometimes, because components are delicate, the fuse blows shortly after the damage has already taken place. My concern is that the logic board has a component(s) fried as a result. The fuse blew only after the fact. Luckily, you did not suffer any damage to your CDJ 200s.

Unfortunately, the cost to fix this situation may be much more than the unit is worth. You're probably looking at having to get another unit to replace it.

Jan 06, 2013 | Behringer Vmx200 DJ Mixer 2 Channels with...

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I used the wrong power supply and now it won't power up at all. Had a look inside for fuses but looks like they are part of the circuit board??


you might of fried the circuit board. if you see fuses and they look burnt out you can try n replace em but my best surruestion is to calll roland and play dumb and tell them it just stopped working chances are its under warranty and youll get a new one.

Jun 20, 2011 | Roland Boss BR1600CD Digital Recording...

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I use my Peavey XR 8600 with an acoustic duo that I'm in. At my last show, an audience member grabbed and dropped a vocal microphone that sent a sharp sound through the Peavey and shut it down. When I...


Chances are one of the power amps has shorted. Replacing the fuse probably fried additional components. Unless you are electronically adept this is NOT a DIY repair.

Expect that this is going to be an expensive repair as often quite a few transistors and other components fry when one goes in these power amps.

Mar 09, 2011 | Peavey Xr 8600 8 Channel Powered Mixer

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My Rocker 30 has been working just fine up until now. I go to turn on the amp and I get no sound whatsoever. The tubes and ht fuse are fine. I've looked at some forums online and they say the fuse might be...


Apparently you have tested the tubes on a tester and usually there is a pilot light that would not be lit if fuse was blown.

Common problems are bad jacks and switch contacts on power amp INPUT or INSERT jacks. Also circuit board cracks and bad solder joints are fairly common, especially where volume controls attach to the circuit boards.

More expensive things are things like fried speaker if volume was played too loud. An ohmmeter test of the speaker would tell if the voice coil has blown.

Jul 16, 2010 | Orange Rockerverb Rk30tc 30watt Electric...

1 Answer

Where can I get a schematic of the circuit board for the MG100DFX. The main fuse as blown and I need information on wiring connection to the transformer and values of other components.


Just a hint to troubleshoot: Connect a 100 Watt light bulb in series with the hot side of the power line into the amp. Make a cord with a light socket and a receptacle to plug the amp into. This acts as a resetable fuse and will send enough current through the amp to not fry stuff, but enough to do troubleshooting.

Apr 01, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

I have a Peavey PV2600 amp that had some blown outputs, open resistors, & burnt misc. components. I have replaced all the parts, but now I have the DDT light on steady for Channel A even with nothing...


Chances are you have NOT got all the bad parts out yet.

HINT: While cold starting an amp after it smoked, put a 150 wat lamp in series with the power cord to act as a current limiter... saves fuses and parts.

The DDT circuits PROBABLY look for amplifier DC balance AND no overload of power supply as protection.

They COMPRESS the audio when it goes above a certain level.

SO, to troubleshoot this you will probably need an oscilloscope.

LOOK for a supersonic oscillation that you cannot hear but MAY be driving the amps beyond the DDT trip point. Drive a pure low level sine wave into the amp and follow it through to see at what point the DDT compressor senses an out of range level.

Remember it HAS worked before, and there is still a bad part in the unit. DO use my suggestion to limit the current as often while troubleshooting this type problem, the signal will suddenly go to a point to fry something, then you get to replace all the parts AGAIN.

Jan 29, 2010 | Peavey Pv 2600 Power Amplifier

1 Answer

Hi have been given a Marshall MBB15 amp to find out why it doesnt produce sound through the input jack, have checked inside, looks like the resistors connected directly to the input jack are dead. Could...


Dead resistors? The evidence would be if the resistors are cracked OR if their is evidence of smoke/fire around them.

In either case, there would LIKELY be damage at least one or two layers deep beyond those resistors if in fact they are fried. If they are cracked physically, teh circuit board also may be cracked due to physical bending. Tripping over an inpout cable can do this.

Causes of this would be shorting the input to power line voltage or the output of a high powered amplifier.

I question that the resistors are "dead".

THE USUAL cause of failures of these small amplifiers is frying of the output power chip which is often in the TDA family of 5/7 terminal amplifier chips in modified TO220 packages.

Another less common problem is failure of the rectifier and filter capacitor combination.

Nov 03, 2009 | Marshall 15 Watt Guitar Amp

2 Answers

Light indicator is on


Try changing the battery, if it doesn't help, some possibilities are:

- dirty contacts or a broken wire on the footswitch

- a broken wire from the distortion output to the output plug

- a broken wire elsewhere in the unit (e.g. potentiometers or rotary controllers)

- a bad input / output level or other potentiometer or rotary controller

- a burnt out component (a bit unlikely, but possible, and it could be anything)

- a bad connector contact inside the unit

- a bad pin solder contact on ANY of the components inside the unit (wires, connectors, switches, jack plugs, resistors,variable resistors, trimmers, diodes, capacitors, transistors, ICs, etc.)

Broken wires / badly soldered pins need to be resoldered, but if there is damage to any of the components, they wil probably need to be replaced.

I hope you can find out what it is.

regards

3rq8 (Triarcuate)

Jul 26, 2009 | Boss Mt 2 Metal Zone Effects Pedal

1 Answer

No output on the right side of the peavey 2600 amplifier but the right is ok


Each channel is protected separately. I suspect that the outputs are fried on the right side or the output fuse has blown. This should be checked by a service shop.

Dan

Jul 15, 2009 | Peavey Pv 2600 Power Amplifier

1 Answer

I have a 20 watt peavey micro bass, and what happened was my brother knocked it over and will not turn on. I checked the fuse and it was ok, any help you would be great.


When it was knocked over it may have cracked the main circuit board, but does the pilot light come on at all? If the pilot light comes on but no sound is output from the speaker try plugging some headphones into the head phone jack and then turn it on and see if you can hear sound in the headphones. I have had a similar problem before and the main speaker had gone bad but it would still play thru the head phone jack.

Apr 22, 2009 | Music

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