Brother HL-1260 service manual Polka dots, Dirt on back of paper

I-5

Polka dots

Possible cause	Step	Check	Result	Remedy
Failure in static-	1	Is there any dirt on the static-charge eliminator?	Yes	Clean the static-charge
charge eliminator				eliminator.
Static-charge	2	Is there continuity between the static-charge	Yes	Ensure the grounding of the
eliminator		eliminator and the chassis?		static-charge eliminator.
grounding failure
Dirt on the	3	Does print quality improve when the transfer	Yes	Clean the transfer roller [Use dry
transfer roller		roller is replaced?		lint-free paper (producing little
				paper dust) to clean the transfer
				roller. Never use solvents] and,
				if the dirt remains, replace the
				transfer roller assy.

I-6

Dirt on back of paper

Possible cause	Step	Check	Result	Remedy
Dirt on the	1	Is there any dirt on the back of the paper feed	Yes	Clean the PF guide or the
PF guide		guide and the jam remove cover near the static-		jam remove cover.
		charge eliminator?
	2	Open the toner cartridge lid in the printer, pull	No	Go to Step 6.
-		out the EP-ED cartridge and remove the paper
		in the printer. Is there already dirt on the back
		of the sheet thus removed?
Dirt on the	3	Is there any dirt on the transfer roller?	Yes	Clean the transfer roller and,
transfer roller				if the dirt remains, replace
				the transfer roller assy.
Transfer input	4	Does the voltage at the 6 pin (HVT1) of the	No	Replace the main PCB assy
signal error		connector P6 on the main PCB change from		or the harness.
		9V to 0V for about 0.8 seconds?
Dirt on power	5	Clean the transfer roller right end bearing, the	No	Clean the contact to assure
supply terminal		check continuity between the transfer roller		the continuity.
Failure in the		power supply spring and the terminal of the
				Replace the high-voltage
		high-voltage transfer unit. Is there continuity?	Yes
transfer high-
				power supply PCB assy.
voltage circuit
Dirt the fixing	6	Is there any dirt on the fixing unit inlet guide?	Yes	Clean the fixing unit inlet
guide				guide.
Fixing roller	7	Are the upper and lower rollers of the fixing	No	Ensure the grounding.
grounding failure		unit securely connected to the chassis via the
Fixing unit failure		diode?	Yes	Replace the fixing unit.

VI - 7