Brother 1250, HL-1030, 1240 service manual All black

CHAPTER 6 TROUBLESHOOTING

I-4

All black

User Check

(1)Clean the corona wire of the drum unit.

(2)The drum unit may be damaged. Install a new drum unit.

Possible cause	Step	Check	Result	Remedy	Ground
					contacts
Corona failure	1	Is the corona wire dirty?	Yes	Clean the corona wire	➁
				with the wire cleaner.
	2	Is the corona wire broken?	Yes	Replace the drum
				unit.
	3	Are the charge electrodes	Yes	Clean both electrodes.	➂
		between the printer body and
		the drum unit dirty?
Harness	4	Is the laser unit connected to	No	Connect the harness
connection		the main PCB correctly?		between the laser unit
				and the main PCB
				correctly.
High-voltage	5	Is the problem solved after	Yes	Replace the high-
power supply		replacing the high-voltage		voltage power supply
PCB failure		power supply PCB?		PCB.
Main PCB failure	6	Is the problem solved after	Yes	Replace the main
		replacing the main PCB?		PCB.

6-27