What does the Data LED indicate on the HL-1650 control panel?
The Data LED is orange and has three states: On means data remains in the printer buffer, Blinking means the printer is receiving or processing data, and Off means there is no remaining data. For more information, Chapter 3 'CONTROL PANEL' in the User's Guide can be referenced. (Page 2)
From the official Brother HL-1650 Monochrome Laser Printer manual, page 2
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