Look at the power requirements listed on the power jack of your Roland keyboard. Alternatively, find this information in the user manual that came with your Roland keyboard. Look for the power input requirements. These numbers are represented in electrical units, either volts or amps, or both.
Visit a music store that sells electronic keyboards. Determine if the store sells replacement Roland keyboard chargers that match the power specifications of your keyboard.
Join the free Roland Backstage service. By activating a membership using your email address, you will have access to the official Roland support team.
Email Roland support through your Roland Backstage membership. Inquire about replacement Roland keyboard chargers for your particular keyboard model. If requested, supply the power input requirements you determined earlier.
Scan the Roland keyboard charger listings of online auction websites. These listings often have specific keyboard chargers for auction. Find one that matches the power input requirements for your Roland keyboard. If the power specifications are not listed on the online auction page, request this information from the seller.
Compare the price of the Roland keyboard charger found through an online auction website with the price quoted by an official Roland technician through Roland Backstage.
Purchase the least expensive Roland keyboard charger from these two options, if desired. Alternatively, consider buying directly from Roland if you seek a reliable item that might come under warranty despite its higher price.