Brother HL-1260 service manual On again?, Scanner unit

M-14 "50 FUSER MALF" is displayed

Possible cause	Step		Check	Result	Remedy
Thermal fuse	1	Is the thermal fuse located in the fixing unit		No	Replace the fixing unit.
		conductive?
Thermistor	2	Remove the fixing unit from the printer and		No	Replace the fixing unit.
		measure the resistance between two pins of
		the 2 pin connector on the fixing PCB. Is the
		measured resistance within the range of
		1.0 M	1.6M (normal temperature)?
Fixing heat	3	Is the fixing heat roller located in the fixing unit		No	Replace the fixing heat roller.
roller		conductive?
Low-voltage	4	When the power is switched on, does the		Yes	Replace the low-voltage
power supply		voltage at connector pin P4-1 on the main			power supply PCB assy.
PCB		PCB go from 5V to 0V?
Main PCB	5	Make sure if:		No	Replace the main PCB assy.
		The EP-ED cartridge is installed in the printer
		correctly.
		The upper cover of the printer is closed.
		A paper-loaded cassette is mounted.

Note: When the printer has detected a fixing unit malfunction, do not power on for about 15 minutes.

Even if the power is on, the printer will shut off the power supply to the fixing heat roller to prevent the fixing the unit from overheating.

M-15 "51 LASER BD MALF" is displayed

Possible cause	Step	Check	Result	Remedy
Main PCB	1	Is the problem remedied when the power off	No	Replace the main PCB assy ,
Scanner harness		and on again?		the SCN harness 4P,SCN flat
				cable 6P or the scanner unit.

M-16 "52 SCANNER MALF" is displayed

Possible cause	Step	Check	Result	Remedy
Main PCB	1	Is the problem remedied when the power off	No	Replace the main PCB assy,
Scanner harness		and on again?		the SCN harness 4P, SCN flat
Scanner unit				cable 6P or the scanner unit.

VI - 17