1. If black vertical
streaks appear on the page
A imaging unit has probably been
scratched.
Remove the imaging unit and install
a new one.
2. If white vertical
lines appear on the page
Clean the inside of the printer. If you
still have the same problems,
replace the imaging unit with a new
one.
3. Foreign matter stuck
onto the window of internal lenses
of LSU mirror.
Clean the LSU window with
recommended cleaner(IPA).
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