Brother HL-1260 service manual Troubleshooting Image Defects, Light

3.2 Troubleshooting Image Defects

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Light

Possible cause	Step	Check	Result	Remedy
Toner shortage	1	Does printed image improve when the EP-ED	Yes	Replace EP-ED cartridge.
		cartridge is replaced?
ECONOMY	2	Is the ECONOMY mode active?	Yes	Cancel the ECONOMY
mode				mode.
Printing	3	Does printed image improve when printed	Yes	Adjust the proper setting
density setting		density setting is changed on the control		on the control panel.
		panel ?
	4	During a printing, open the toner cartridge lid	Yes	Go to the Step 9.
		in the printer and pull out the EP-ED cartridge.
-		Open the drum shutter of the EP-ED cartridge
		and check the toner image on the drum.
		Is the toner image before transfer is light?
Paper failure	5	Does the print quality improve when fresh	Yes	Use recommended paper.
		paper is used?
Transfer roller	6	Does the print quality improve when print is	Yes	Clean the transfer roller [Use
failure		made with transfer roller changed?		dry lint-free paper (producing
				little paper dust) to clean the
				transfer roller. Never use
				solvents] and, if dirts subsist,
				replace the transfer roller assy.
Transfer input	7	Do the pins 7 and 8 of the connector P6	No	Replace the main PCB assy
signal error		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 paper
		feeding.
		P6-8 pin (HVT3) --- Change in voltage from
		9V approx. to 0V just when the voltage at the
		7 pin changes from 0V to 15V.
Dirt on power	8	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
			Yes	Replace the high-voltage
Failure in the		high-voltage transfer unit. Is there continuity?
transfer high-				power supply assy.
voltage circuit
Insufficient LD	9	Does print quality improve when the scanner	Yes	Replace the scanner unit or
light		unit is improved?		the harness.

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