This machine enters the Silent mode after a specified amount of time has elapsed following a print job, or a key operation is performed. You can specify the amount of time that elapses prior to entering the Silent mode.
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NOTE
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If '0' is selected, the Silent mode is not set.
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1.
Press 
→ [Preferences] → [Timer/Energy Settings] → [Silent Mode Time].
→ [Preferences] → [Timer/Energy Settings] → [Silent Mode Time].2.
Press [-] or [+] to enter the desired time period → press [OK].