Sega TETRIS GIANT Owner's Manual page 54

Using a commercially available conversion adapter (Taiwan only)
When using a conversion adapter sold on the market to provide power, connect the adaptor's earth wire terminal to
an "earth terminal that is securely grounded".
EARTH WIRE
3
The power cable is laid out indoors. Protect the power cable by attaching wire cover to it. If the cabinet
was grounded using a separately prepared earth wire, cover the indoor wiring at the same time.
Always connect earth wire.
CONVERSION ADAPTER
POWER PLUG
Conversion adapter
WIRE COVER
ASSEMBLY AND INSTALLATION
45
6