Brother HL-1240 - Manual (Page 37)

CHAPTER 1 ABOUT THIS PRINTER
1-29
Data (Toner) LED indications
The Data LED indicates the current status of the print data process.
LED Printer status
Off
❍
The printer has no print data.
Blinking The printer is receiving data from the computer or the printer is
processing data in memory.
On


Print data remains in the printer memory. If the Data LED is on for a
long period of time and nothing has printed, you need to press the
button to print the remaining data.