When the machine is used as a Windows printer, enabling 'Use SNMP' causes the operating system to collect machine status information at specific intervals, pre-
venting the machine from starting a sleep state.
To avoid the situation, disable the setting (Windows' printer properties).
-Disabling 'Use SNMP'
1) Select 'Configure Port' on the Ports screen (printer properties).
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2) Remove the check mark from 'SNMP Status Enabled'.