Brother 1240, HL-1030, 1250 service manual Downward fogging of solid black, Horizontal lines

CHAPTER 6 TROUBLESHOOTING

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Downward fogging of solid black

Possible cause	Step	Check	Result	Remedy
Toner cartridge	1	Is the problem solved after	Yes	Replace the toner cartridge.
failure		replacing the toner cartridge?
High-voltage	2	Is the problem solved after	Yes	Replace the high-voltage power
power supply		replacing the high-voltage		supply PCB.
PCB failure		power supply PCB?

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Horizontal lines

Possible cause	Step	Check	Result	Remedy	Ground
					contacts
Paper feed roller	1	Are the feed roller shaft and	No	Check the connection
		the ground contact connected		between the shaft and
		correctly?		the ground contact.
				Also check the ground
				contact on the back of
				the feed roller. Refer
				to P.4-28.
Paper cassette	2	Are the ground contacts on the	No	Clean the contacts.	➆
contacts		back side of the paper cassette
		connecting correctly?

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