You can set Auto Power Off.
Setting Auto Power Off
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Open the Web page of this machine.
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Log in as the administrator.
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Click [Admin Setup].
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Click [User Install] > [Power Setup].
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Select [Auto Power Off], and then click [Submit].
Setting the Transition Time
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Open the Web page of this machine.
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Log in as the administrator.
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Click [Admin Setup].
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Click [Management] > [Power Save].
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Select [Auto Power Off Time], and then click [Submit].