【Power Confirmed】SHARP Electronic Cash Register ER-A310S Showa Retro Junk

This is a Sharp ER-A310S electronic cash register that was found in my family's storehouse.
It has a vintage design that is difficult to find nowadays.

[Product Condition]
Exterior: There are signs of age-related discoloration (yaké), minor scratches, and dirt overall.
Damage: A tab on the printer cover is broken, making it loose (see image).
Operation: Confirmed only that it powers on and the display numbers light up when plugged in.
Keys & Drawer: A key is included, but it is unclear whether it's due to my lack of knowledge on how to operate it or if the key is not compatible, but the drawer (cash tray) cannot be opened in its current state.
Accessories: Main unit, power cord, key (1).
*Receipt rolls are not included.

[Notes]
It is unknown if all functions operate correctly.
As this is an old precision electronic device, please only purchase if you understand that it is sold as-is, no claims, no returns, and if you intend to repair it, use it for parts, or as a retro interior decoration.
Basic cleaning will be performed, but please excuse any dirt in small crevices.
The item will be carefully wrapped in bubble wrap and shipped in a cardboard box.