Brother HL-1240 - Manual (Page 79)

CHAPTER 4 TROUBLESHOOTING
4-5
If you see any of these service call indications, turn off the power switch, wait a few
seconds, then turn it on and try to print again.
If you cannot clear the error and see the same service call indication after turning on
the printer, consult your dealer or our authorized service representative. Please note
the indication and report the error status and problem by referring to the above table.
✒ Note
Ensure that the front cover is fully closed before reporting a Service call.