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Unfortunately, battery jacks and plugs similar to the type you're describing do not have any real standardization - unlike the outlets and plugs in homes and businesses have.
You best bet is to either bring the plug / jack to a shop to match it or contact the instrument's manufacturer to obtain the connector specs for physical dimensions
Be sure to obtain the power requirements in either watts or amps so that you can obtain a power source capable of delivering what you need without overheating during longer periods of use. Adding 25% to 50% more amps or watts to the minimum required should provide years of trouble free service. Example: 9VDC at 50 watts should be supplied by a 9VDC 62 watts or even 75 watts; or in the case of a rating of 9VDC at 6 amps should be supplied by a 9VDC at 7.5 amps or even 9 amps. With DC powered devices, make sure you observe proper polarity! Good luck!
Most of the time these things will have the negative in the middle of the socket and positive on the outside. I have found this true on most musical equipment but, other electronics will usually have the opposite. If it says 2000 mA, it has to have at least that much current to work properly, more is ok, less is not. Voltage must be the same to avoid damage. FIRST, I would definitely check the power supply with a test meter to be sure it is dead. The socket has a switch mechanism to turn on the battery when it is unplugged which could be stuck. If it were mine, I would take it back where I bought it and let them deal with it.
Which Line 6 power supply? If you look at the specs stamped into the L6 supply you should see the voltage, current capacity, and polarity (if DC). Polarity would have a symbol showing an inner post and outer shell and indicate which is positive....referred to as positive or negative tip. Let me know what these specs are and I can have a better idea of what may have happened. Sounds like it burned out a protection circuit designed to protect the pedal from incorrect power applied. Will it still work with a battery?
Does it function on the batteries? It may be there are batteries in it that have leaked, or are low. Have you checked the power supply coaxial end to make sure it is the correct polarity for the FM4? Is the supply also putting out power?.If not it may be relying on the batteries. or what power is stored inthe capacitors when the power supply is attached.
You might try resetting it. the manuals are here: http://line6.com/support/manuals/fm4 Although the pilot manual you need to add the extension ".pdf" to it because they forgot to add it on their end.
Hi, Provided there is a tag on the back showing the units model number, on that same tag should be the power requirements for it-buying a universal power supply, or even a used working one to another piece of equipment is acceptable as long as the polarity is the same. Polarity is located right next to where the power supply plugs into the unit. It will be a " circle with a dash inside it with a line connecting to a C looking symbol with a line coming out of it connecting another circle with a plus sign inside. " that is a typical outer ground/inner positive marking. a power supply will be marked the same. If they match the polarities are the same. Next make sure the power supply says the proper DC voltage and Milliamps or amps-Ma/A example: 2400Ma, 2.4a. I hope this helps and thank you for asking FixYa, good luck and don't forget to write back and let me know how I did, Prodzilla.
Your adapter should be a 12 volt DC delivering 2 amps (2000 ma). If the adapter is too small, you will have the symptoms you are seeing. Make sure the polarity is correct. DO NOT use the so called "universal adapters".
The supply has a three pin connector and supplies +10 and -10 volts at unknown current. Don't have a pinout.
I am sure you can cobble something up if you can''t find the ACH120 official power supply.
You would need to find the pinout polarity to connect power if you have to make your own. One would taake unit apart and trace those input wires to something that would define the polarity. First find ground, then look for input filter caps which will tell you the polarity on the pins.