Oki Pos 407II - Manual (Page 13)

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3-4. Connecting the Optional AC Adapter
Note: Before connecting/disconnecting the AC adapter, make sure that power to the printer
and all the devices connected to the printer is turned off. Also make sure the power
cable plug is disconnected from the AC outlet.
() Connect the AC adapter to the power cable.
Note: Use only the standard AC adapter and power cable.
() Connect AC adapter to the connector on the printer.
() Insert the power cable plug into an AC outlet.
CAUTION
When disconnecting the cable, take hold of the cable
connector to pull it out. Releasing the lock makes it easy
to disconnect the connector.
Pulling the cable excessively could cause damage to the
connector.