How can I enable Quiet Mode in the HP DeskJet GT 5820 series printer?
Quiet mode, which reduces printing noise without affecting quality, is turned off by default. To turn it on from Windows, open the HP printer software and click the Quiet Mode tab. Select 'On' and click Save Settings. Alternatively, go to the Embedded Web Server (EWS) settings and select Quiet Mode as On. (Page 27)
From the official HP Deskjet GT 5820 All-in-One Printer manual, page 27
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