Sega INITIAL "D" TYPE TWIN. - Manual (Page 31)

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 Ensure that the Main SW is OFF.
The AC Unit is located on one side of Cabinet. The AC Unit has Main SW, Earth Terminal and
the Inlet which connects the Power Cord.
FIG. 6. 4 a AC unit
 Be sure to independently use the power supply socket outlet equipped with
an Earth Leakage Breaker. Using a power supply without an Earth Leakage
Breaker can cause a fire when electric leakage occurs.
 Ensure that the "accurately grounded indoor earth terminal" and the earth
wire cable are available (except in the case where a power cord plug with
earth is used). This product is equipped with the earth terminal. Connect the
earth terminal and the indoor earth terminal with the prepared cable. If the
grounding work is not performed appropriately, customers can be subjected to
an electric shock, and the product's functioning may not be stable.
 Ensure that the power cord and earth wire are not exposed on the surface
(passage, etc.). If exposed, they can be caught and are susceptible to damage.
If damaged, the cord and wire can cause electric shock and short circuit
accidents. Ensure that the wiring position is not in the customer's passage
way or the wiring has protective covering.
 After wiring power cord on the floor, be sure to protect the power cord.
Exposed power cord is susceptible to damage and causes an electric shock
accident.
Main SW off
POWER SUPPLY, AND EARTH CONNECTION
WARNING!
4
INLET
MAIN SW
AC Cable (Power Cord)
* Note: Actual Power Supply connection
may vary from photo