This is from the manual, i’m abit confused on what you are actually using, a Boss ac adapter or the actual EH supplied adapter, make sure its the correct current/voltage… otherwise you may have a dud (either the pedal itself or the ac adapter) and need to return it for another? i would see if you can take it to a music store and if they have another compatible adapter to plug into it first.

9V Power Jack

Plug the output of the SMMH’s supplied AC Adapter into the 9V power jack located at the top of the SMMH. The SMMH requires 9 – 9.6VDC at 200mA with a center negative plug. The SMMH accepts Boss style AC Adapters.

WARNING: Use only the US96DC-200BI adapter that the Stereo Memory Man w/ Hazarai comes supplied with. Do not use any other AC adapters. Using other AC adapters, even those made by Electro-Harmonix, could cause harm to the unit, the adapter or you. The SMMH does not use batteries.