Brother HL-1240 - Manual (Page 40)

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Control Panel Button Operations
The control panel button is used for the following purposes depending on the
situation.
Cancel Printing
If you press the button during printing, the printer immediately stops printing and
ejects the paper.
Wake-Up
If the printer is in sleep mode, pressing the button wakes it up into the ready state. It
will take up to 45 seconds for the printer to go into the
Ready state.
Form Feed
If the Data LED is on, press the button. The printer prints any data remaining in the
printer memory: this operation is called “Form Feed.”
Error Recovery
If an error occurs, the printer will recover from some errors automatically. If the
error does not clear automatically, press the button to clear the error and continue
printer operation.