The recommended power adapter for the TM-1 is the BOSS PSA series*. They can be purchased at most all Roland and BOSS retailers. For more details, please contact the distributor or support in your area. https://www.boss.info/global/international/
*Models vary depending on the voltage in the country/region where they are sold.
Caution: The use of a different power adapter may cause malfunction and/or permanent damage to the TM-1.