Brother HL-1260 service manual Dropout, White vertical streaks

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Dropout

Possible cause	Step	Check	Result	Remedy
Paper failure	1	Is recommended paper used?	No	Use recommended paper.
Paper soaked	2	Is paper soaked?	Yes	Store the paper in packing
				paper to keep it from soaking.
EP-ED cartridge	3	Does printed image improve when the EP-ED	Yes	Replace the EP-ED cartridge.
		cartridge is replaced?
Transfer roller	4	Is there any dirt on the transfer roller or is it	Yes	Clean or replace the transfer
failure		deformed?		roller assy.
Transfer input	5	Do the pins 7 and 8 of the connector	No	Replace the main PCB assy
signal error		P6 on the main PCB have the following value		or the harness.
		respectively when a sheet of paper is fed from
		the MP tray?
		P6-7 pin (HVT2) --- Change in voltage from
		15V approx. to 0V about 1 second after a
		sheet of paper is fed.
		P6-8 pin (HVT3) --- Change in voltage from
		9V approx. to 0V when the voltage at the
		pin 7 changes from 0V to 15V.
Dirt on power	6	Clean the transfer roller right end bearing, the	No	Clean the contact to assure
supply terminal		check continuity between the transfer roller		the continuity.
		power supply spring and the terminal of the
		high-voltage transfer unit. Is there continuity?
Failure in the			Yes	Replace the high-voltage
transfer high-				power supply PCB assy.
voltage circuit

I-12

White vertical streaks

Possible cause	Step	Check	Result	Remedy
Toner bias	1	Do white vertical stripes appear like a band?	Yes	Rock the cartridge, set it
				again in the printer and
				check again the print quality.
Drum damage	2	Does print quality improve when the EP-ED	Yes	Replace the EP-ED cartridge.
		cartridge is replaced?
Transfer roller	3	Is the transfer roller damaged or deformed?	Yes	Replace the transfer roller
failure				assy.
Dirt on the	4	Is the problem solved when the scanner unit	Yes	Clean the reflecting mirror
reflecting		is replaced?		with a cleaning tip or replace
mirror				the scanner unit.

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