Brother 1240, HL-1030, 1250 Insufficient output from high-voltage power supply unit, BD failure

CHAPTER 6 TROUBLESHOOTING

M-5

Insufficient output from high-voltage power supply unit

Possible cause	Step	Check	Result	Remedy
High-voltage	1	Do any of the terminals on the	Yes	Clean the terminals.
contact		high-voltage contacts have dirt
		or contact burns?
High-voltage	2	Check the connections of the	Yes	Replace the high-voltage
power supply		connector between the high-		power supply PCB
PCB		voltage power supply and the
		engine PCB are secured
		correctly.
			No	Reconnect the connector
				between the high-voltage
				power supply and the engine
				PCB.

M-6

Fixing heater temperature failure

Possible cause	Step	Check	Result	Remedy
Poor thermistor	1	Is the contact of connector P6	No	Reconnect the connector.
harness contact		on the engine PCB good?
Blown thermal	2	Remove the fixing unit and	Yes	Replace the fixing unit.
fuse		measure the resistance of the
		thermistor. Is it open circuit?
Thermistor	3	Is the thermistor installed	Yes	Replace the fixing unit.
failure		properly?
			No	Reinstall the thermistor
				properly.
Halogen heater	4	Remove the fixing unit and	Yes	Replace the halogen heater
lamp failure		measure the resistance of the		lamp.
		halogen heater lamp. Is it
		open circuit?

M-7

BD failure

Possible cause	Step	Check	Result	Remedy
Harness	1	Is connector P10 on the main	No	Reconnect the connector
connection		PCB secured correctly?		securely.
failure
			Yes	Replace the laser unit.

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