Used SEGA MARK Ⅲ Console system Boxed - Tested & Working

What We Did Before This Ships

Every console we sell is opened up and serviced by hand.
We don't just confirm it powers on — we look inside.

• This unit was fully disassembled and cleaned internally; dust was removed from all components.
• All boards and electrical contacts were cleaned with ethanol and a fast-drying, residue-free electronics cleaner to remove oxidation and residue.
• Moving mechanical parts were lubricated with a light application of silicone grease for smooth, quiet operation. (We do not apply grease to electrical contacts — they are cleaned only.)
• Electrolytic capacitors are replaced only when there is visible corrosion or leakage — nothing more, nothing less. For console families known for capacitor failure, a full recap is performed as standard.
• If a console cannot be properly restored, we do not sell it.
• After reassembly, the unit is tested with an actual game: video, sound, and controller input are all confirmed.
• Before we seal the box, we power the console on one more time and confirm it is still working.
• Every console includes 30 days of support after it reaches you.

A note on power: this console uses Japan's 100V standard. Buyers in North America (120V) are advised to use a step-down transformer or a multi-voltage power supply; buyers in Europe (230V) will require a step-down transformer to use an original 100V adapter safely.

A note on region: This is a Japanese Sega SG-1000 (or SG-1000 II). It uses the same cartridge format as the Japanese Mark III and the Japanese Master System. Western Master System cartridges (50-pin) are physically incompatible with the Japanese SG-1000's 44-pin slot and will not fit without an adapter. There is no software-level region lock; the barrier is purely physical connector incompatibility.

If anything here isn't covered, just ask — questions are always welcome.