Brother HLL3290CDW Service Manual page 166

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One color band
<User Check>
• Clean the corona wire of the drum unit.
• Clean the corona wire by sliding the green tab of the drum unit to the left end.
• This problem may disappear after printing multiple sheets of paper.
• Refer to <How to clean the drum unit>
cotton applicator.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step
A ground wire or ground plate
installation failure (Grounding
1
is not performed correctly.)
2 LED ASSY failure
<How to clean the drum unit (the shape of the drum is different from the actual one)>
(1) Remove the appropriate toner cartridge from the drum unit. Check where the image
distortion occurs by placing the print sample in front of the drum unit.
< Examples of image distortion >
White dots repeat in A mm distance on the black
page with printed images.
Refer to the table
to remove the dirt from the exposure drum using a
Cause
Fig. 2-19
A mm
A mm
Fig. 2-20
<Pitches on images caused by rollers>
2-130
Remedy
Retighten the screws of each ground wire or
ground plate. Repair the bend of the tray
ground spring of the T1.
(Refer to Fig. 2-18 (P2-124).)
Replace the appropriate LED ASSY.
Black dots repeat in A mm distance on
the page.
for what represents the value A.
A mm
A mm
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