Brother 2150N, 2170W, HL-2140 16), 17), 18), Fan failure, Main motor failure, 15)Laser unit failure, High-voltagepower supply PCB failure

15)Laser unit failure

Laser diode failure

	Step	Cause	Remedy
	1	Laser unit harness connection	Check the two harness connections of the
		failure	laser unit and reconnect them.
		FG harness ASSY connection	Check the FG harness ASSY connection
	2	failure	between the laser unit and main PCB
			ASSY. Then reconnect it.
	3	Laser unit failure	Replace the laser unit.
	4	Main PCB failure	Replace the main PCB ASSY.
16)	Main motor failure
	Step	Cause	Remedy
	1	Main motor harness connection	Check the harness connection of the main
		failure	motor and reconnect it.
	2	Main motor failure	Replace the drive sub ASSY.
	3	Low-voltage power supply PCB	Replace the PS PCB unit.
		failure
	4	Main PCB failure	Replace the main PCB ASSY.
17)	High-voltage power supply PCB failure
	Step	Cause	Remedy
		High-voltage power supply PCB	Check the harness connection between the
	1	ASSY harness connection failure	high-voltage power supply PCB and main
			PCB. Then reconnect it.
	2	High-voltage power supply PCB	Replace the high-voltage power supply
		failure	PCB ASSY.
	3	Low-voltage power supply PCB	Replace the PS PCB unit.
		failure
	4	Main PCB failure	Replace the main PCB ASSY.
18)	Fan failure
	Step	Cause	Remedy
	1	Fan harness connection failure	Check the harness connection of the fan
			motor 60 unit, and reconnect it.
	2	Fan failure	Replace the fan motor 60 unit.
	3	Toner sensor PCB failure	Replace the toner sensor PCB
	4	Main PCB failure	Replace the main PCB ASSY.

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