If you use AirPrint (Print) for the first time, you must add the machine to a computer.
Memo
The screen of OS X 10.10 is used as an example.
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Turn on the machine and computer.
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Connect this machine to the computer with a wired or wireless LAN.
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Select [System Preferences] from the Apple menu.
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Click [Printers & Scanners].
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Click [+], and then click [Add Printer or Scanner].
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Select [OKI-C542-******] and then click [Add].
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Check that the machine is displayed in [Printers], and [OKI C542-AirPrint] is displayed in [Kind].
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Close [Printers & Scanners].

