HP LaserJet Pro CP1520 - Software Technical Reference

Set the Connection time-out (I/O) setting to any value from 5 to 7200 seconds (default is 120).
Set the Sleep Delay setting to any of the following values:
Never
1 Minute
15 Minutes
30 Minutes
1 Hour
2 Hours
Set the user-defined low setting for the print cartridges by using the Black user-defined low, Cyan
user-defined low, Magenta user-defined low, and Yellow user-defined low fields. Valid entries for
user-defined low setting are 1–100%.
NOTE: Click Apply to make the changes take effect.
Service
Use the Service pane to activate cleaning mode.
Figure 2-30 System Settings folder – Service pane
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