Brother HL-2250DN Service Manual page 37

Pressing one time
LED
All On for 0.5 seconds
:
LEDs Off for 0.5 seconds
Pressing two times
of the [Go] button of the [Go] button
Laser Unit Failure
Main PCB Failure
2-14
Refer
Type of error
to:
Laser unit failure
4.7.1
Polygon motor
failure
4.7.1
Main PCB failure
4.8.1
Confidential