How do I print a configuration sheet or supplies information report from the control panel?

To print a configuration sheet, press and hold the button (WPS on wireless models, Print Screen on non-wireless models) for about 10 seconds until the green LED blinks slowly, then release. To print a supplies info report or error report, press and hold the same button for about 15 seconds until the green LED turns on, then release. (Pages 53-54)

From the official HP Samsung Xpress SL M2021 Laser Printer Series manual, page 53

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