Kyocera Ecosys m2040dn - Manual (Page 77)

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Installing and Setting up the Machine > Quiet Mode
Quiet Mode
Lower print speed for quiet processing. Select this mode when the running noise is uncomfortable.
When the [Quiet Mode] key is selected, the [Quiet Mode] key blinks and Quiet Mode is enabled.
NOTE
The processing speed will be slower than normal when in Quiet Mode.
[Quiet Mode] key