Brother HL 3070CW - Manual (Page 140)

Routine Maintenance
130
5
f
Put the paper tray back in the printer.
g
Plug the printer back in, and then turn on the power switch.
Cleaning the LED head
5
a
Turn off the printer power switch and then unplug the printer.
b
Fully open the top cover by lifting up on the handle (1).
1