Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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Need power supply fuse size - Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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Since the fuse is internal it should be marked on the circuit board where the fuse holder is. If it is blown and it is the original fuse it should be marked on the fuse. When in doubt, here is the contact info:http://www.marshallamps.com/support/support_contact_us.asp Do not attempt repairs yourself unless you can proceed safely. Amplifiers store lethal charges.

Posted on Nov 11, 2010

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Does my Casio g-200 keyboard have a fuse ? If so what type and where is it ?


I'd go exchange the power supply for the correct one (check the voltage, polarity and mA rating that's marked next to the power input). It may be too late, though.
There will be a fuse on the internal power input board, as well as one in the power supply, but if the instrument is turning on and lighting up, it's not a blown fuse.

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Model Yamaha ME-50 no power


John
With AC power off.
Use a meter (on Ohms scale) to check internal fuse for blown (open) fuse.
If you feel qualified & safe with AC Power On.
Check input to internal power supply on AC Scale (Caution when AC is on) for volts in.
Use meter on internal Power Supply for "probably" DC volts leaving internal Power Supply electronics to power the rest of the electronic circuits.
Switch mode power supplies can break down. They stop doing their high frequency switching so they don't convert AC to DC.
If this P/Sup is a separate box or circuit board, inside the unit, then it can have a part number & be replaced.
Good Luck

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2 Answers

Peavey tnt 115 blowing fuses


Very unlikely, sounds like it's faulty. Was this on plugging in or were you using the amp, and if so doing what? What is your supply oltage?

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1 Answer

NO POWER. CORD TESTED OK AND IVE ALREADY CHANGED THE FUSE BUT STILL NO POWER...


Why did you change the fuse? If it was blown, then power supply has failed. Here is your schematic. The power supply is on page 14.

http://elektrotanya.com/behringer_ub-2222fx-pro.pdf/download.html

Scroll down the page at the site to the "Get Manual" Click on that to download the schematic. When working on line operated supplies use an isolation transformer for personal safety. The regulator chip IC2 has probably failed but test before changing. HINT: When restoring the supply, put a 60 watt light bulb in series with the hot power lead to act as a resetable fuse... saves fuses and also other components if all the bad parts haven't been weeded out.

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1 Answer

StageSetter 8: when the power switch is turned on the internal fuse blows immediately.


Likely the filter caps or the rectifier diodes have shorted. Power supplies are easy to work on unless the are switching type.

To work on this, replace the fuse and put a 25 watt light bulb in series with the hot side of the inout power... saves fuses and will send enough current in to troubleshoot with a meter. Use SAFE procedures when working on electrical equipment. For switching power supplies you need to use a line isolation transformer for personal safety.

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1 Answer

Good evenin' pluged a dx626 to 220V with all as it was from stock. it light for a moment and from that time doesnt work. problem in fuse? please help


It could have blown the fuse. The fuse is a part of where the power cord plugs in behind a little cover.

Most of the electronics is fairly well protected. If fuse is blown, replace with identical size and try it once. If it blows again, some parts in the power supply are damaged and will require service.

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1 Answer

Samson MDR8 blowing internal power supply fuses. Is there a wiring schematic of the power supply board available


Here is a troubleshooting hint:

Put an incandescent lamp in series with the hot side of the power cord. This acts as a resetable fuse while troubleshooting so you don't blow fuses.

Schematics are hard to come by, but power supplies are easy to trace the circuitry.

Check filter caps and the diodes and THEN look for hot (temp) IC's and transistors.

Mar 17, 2010 | Samson Music

2 Answers

Hi im in Argentina and i accidentally pluged in my amp without an adapter now it doesnt work what needs to be fixd?


The power supply is blown. Argentina is 220V I believe. I have never seen a power supply schematic for this however being that it is low power it is a linear supply not switching. Either the rectifier diodes are blown out or possibly the output capacitors are blow due to approx double voltage. If you try this yourself be careful otherwise get a new amp. Good Luck

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1 Answer

I have a lowrey organ and when i plug it in it does nothing . no power at all anybody got any ideas


If you feel comfortable doing it you could try removing the back and examining the power supply. Make sure the power cord is not plugged in. Remove the screws holding the back on the organ. Look to see where the power supply is. It will be a fair sized metal box that the power cord comes out of. Look for a fuse holder on the box.If there isn't one or you already checked the fuse look to see how the power supply is fastened down. If you can remove it you can check the power cord from the plug end to the connection in the power supply with a volt ohm meter on the lower resistance scale. Check both sides of the power cord . Look for an internal fuse soldered into the circuit if there is one. Check it also. You can also check the power switch the same way. Think of the power cord and switch etc as a garden hose. You want to make sure that the flow of electricity is not interrupted any where between the plug and the power transformer. Do all these tests with the cord unplugged. Also avoid touching anything connected to the filter capacitors as they store dangerous amounts of electricity. If none of this helps note the plug that connects the power supply to the organ. Unplug it and take the power supply in to be tested. A good piano service place should be able to direct you to someone. Also remember that something had to make the power supply fail if it is indeed faulty. None of this is simple or recommended for a person who has no experience with electricity or electronic repair. If you feel at all hesitant about doing it you are better advised to consult a repair person. If you do have experience but no schematic you can still usually find the problem with careful thought and procedure. Break the circuit down into modules and test them one at a time starting with the power supply. It could be something as simple as a frayed cord or blown fuse to something as complex as a burned out transistor or faulty tube ( in the case of older organs) causing the power supply to fail. I once repaired a home organ that the power supply blew in again because of the customers house wiring. That particular wall plug in had been wired improperly. Hope all this helps.

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