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Power supply polarity

My power supply for my line 6 JM4 Looper was dead on arrival. Does anyone know what polarity it is. does it need to have a 2000 ma power supply to work?

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Hi, i need to know the exact power plug so i dont have to run the pedal on battery power.i know i need a 9v power supply but i dont know the size of the jack that goes into pedal..many thanxs..


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!

Mar 16, 2016 | Music

1 Answer

Power supply polarity


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.

Mar 29, 2014 | Line 6 JM4 Looper

1 Answer

Used my line6 adapter on boss mt2. there was a little smoke at the ac in. the pedal stopped working. please help!


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?

Aug 25, 2012 | Boss Mt 2 Metal Zone Effects Pedal

1 Answer

I have a fm4 and used the m13 power supply,...first the second and forth lights light up then it's unresponsive?


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.

Apr 03, 2012 | Line 6 FM4 Filter Modeler Effects Guitar

1 Answer

Buying a used Tascam 788. P.O. lost the power supply. How can I get a replacement? Couldn't find anything on TASCAM site.


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.

Apr 23, 2011 | Record Tools Tascam Dp02 8 Track Digital...

1 Answer

Yamaha psr-280 flashing display no key response or sound. Is it dead??


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".

Apr 13, 2011 | HQRP AC Adapter / Power Supply for Yamaha...

1 Answer

I have a rhodes 660, and it doesnt trun on. all u hear is a buzzing sound. does anyone know whats wrong.


This is LIKELY a power supply problem. The unit should have a label telling the power requirements. Match the polarity on DC units as well as the type AC od DC and voltage and current.

I suspect the input voltage from the supply is way lower than the required.

Apr 22, 2010 | Music

1 Answer

Just got hold of a Roland R8 but no power supply - any ideas?


Well, you might try:

http://www.yub.com/products/?productID=3190411

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.

Jan 30, 2010 | Music

1 Answer

Dead nothing on display but power supply lead checks out okay 11.5 volts in nothing happens no power up or display PSRE 403 yamaha


If the power supply is NOT the original one, it may be reversed polarity.

The supply should be a PA-3C with the center being "+".

Sep 23, 2009 | Yamaha Music

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