You can use
the printer software to change the time period before the printer
turns off automatically.
Do one of the following:
OS X 10.6/10.7/10.8/10.9: In the Apple menu
or the Dock, select System
Preferences. Select Print & Fax, Print & Scan, or Printers & Scanners, select your
product, and select Options &
Supplies. Select Utility
and select Open Printer
Utility.
OS X 10.5: In the Apple menu or the Dock,
select System Preferences. Select
Print & Fax, select your
product, and select Open Print
Queue. Select Utility.
Select Printer
Settings. You see this window:
Select the length of time after which you want the product
to automatically turn off when it is not in use as the Power Off Timer setting.