Brother HL-820, HL-1020 manual Black vertical streaks in a gray background, White vertical streaks

I-8

Black vertical streaks (in a gray background)

Possible cause	Step	Check	Result	Remedy
Translucent	1	Are there any stains on the	Yes	Clean the scanner window.
stain on the		scanner window?		If it is not effective, replace the
scanner window				scanner unit.

I-9

White vertical streaks

Possible cause	Step	Check	Result	Remedy
Scanner window	1	Is the scanner window dirty?	Yes	Clean the scanner window with
dirty				a dry tissue.
Transfer failure	2	Is the transfer roller scratched?	Yes	Replace the drum unit.

I-10

Faulty registration

Possible cause	Step	Check	Result	Remedy
Excessive paper	1	Is the paper loaded in the	Yes	Instruct the user to keep paper
load		paper feeder more than 22mm		loads below 22mm in depth.
		deep?
Print paper	2	Is the specified weight of the	No	Instruct the user to use the
		recommended paper being		recommended types of paper.
		used?
Ditto	3	Is the first printing position	Yes	Adjust the Y offset by using the
		within ±1mm of the tolerance		utility software supplied.
		specification?
Paper resist	4	Is the position of the paper	No	Reposition the sensor to the
sensor position		resist sensor normal?		correct position.
incorrect

IV-11