Brother International HL 1850 Service Manual - Page 214

/1870N, SERVICE, MANUAL, Position, smudge, interval, sample, Photosensitive

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HL-1850/1870N SERVICE MANUAL NOTE: Clean the drum unit as follows: (1) Remove the toner cartridge from the drum unit. Place the printing samples in front of the drum unit, and find the exact position of the image defect. Drum unit Position of smudge on the drum 94mm interval Printing sample Fig. 6-31 (2) Turn the drum gear by hand while looking at the surface of the photosensitive drum. -e- Photosensitive drum Q Fig. 6-32 (3) Wipe the surface of the photosensitive drum with a cotton swab until the dust or paper powder on the surface comes off. Photosensitive drum a Fig. 6-33 CAUTION: • Do not wipe the surface of the photosensitive drum with something sharp. (ball-point pen etc.) • Use cleaning liquid which is a 50-50 mixture ofethyl alcohol andpure water. 6-47

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HL
-1850/1870N
SERVICE
MANUAL
NOTE:
Clean
the
drum
unit
as
follows:
(1)
Remove
the
toner
cartridge
from
the
drum
unit.
Place
the
printing
samples
in
front
of
the
drum
unit,
and
find
the
exact
position
of
the
image
defect.
Drum
unit
Position
of
smudge
on
the
drum
94mm
interval
Printing
sample
Fig.
6-31
(2)
Turn
the
drum
gear
by
hand
while
looking
at
the
surface
of
the
photosensitive
drum.
-
e
-
Q
Photosensitive
drum
Fig.
6-32
(3)
Wipe
the
surface
of
the
photosensitive
drum
with
a
cotton
swab
until
the
dust
or
paper
powder
on
the
surface
comes
off.
a
Fig.
6-33
Photosensitive
drum
CAUTION:
•
Do
not
wipe
the
surface
of
the
photosensitive
drum
with
something
sharp.
(ball-point
pen
etc.)
•
Use
cleaning
liquid
which
is
a
50-50
mixture
of
ethyl
alcohol
and
pure
water.
6-47