Brother MFC-L2712DN - Page 45


White spots on image
<Pitches on images caused by rollers>
Fig. 2-19
Refer to the <Pitches on images caused by roll
ers> table above for what represents the value A.
<User Check>
•
Check
that t
he fa
n is
not cl
ogged.
•
R
ef
er
to
<How to clean the drum unit>
to remove the dirt from the
exposure drum using a cotton
applicator.
•
Repla
ce the
drum u
nit wit
h a ne
w one.
•
Repla
ce the to
ner cart
ridge w
ith a ne
w one.
S
t
e
p
C
a
u
s
e
R
e
m
e
d
y
1
Dirt on the paper dust
cleaning roller of the paper
tray
Refer to the
Fig. 2-14 (P2-73)
to clean the
paper dust cleaning roller.
2
D
i
r
t o
n t
h
e e
x
p
o
s
u
re
d
r
u
m
Pe
r
f
or
m d
r
u
m c
l
e
a
n
i
n
g
.
(Refer to
“2.1 Drum Cleaning” in Chapter 5
.)
3
C
l
o
g
g
e
d
f
i
l
t
e
r
C
l
e
a
n
t
h
e
f
i
l
t
e
r
.
4
Scratch or dirt on the fuser
unit
Replace the fuser unit.
5
High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY
.
Note:
Image defects which appear periodically may be caused by failure of rollers. Refer to the
table below and determine the cause based on the pitch at which defects appear on the
image.
Part name
The pitch which
appears in the image
D
e
v
e
l
o
p
r
o
l
l
e
r
2
6
.
5
m
m
E
x
p
o
s
u
r
e
d
r
u
m
9
4
.
5
m
m
H
e
a
t
r
o
l
l
e
r
o
f
t
h
e
f
u
s
e
r
u
n
i
t
7
8
.
5
m
m
P
r
e
s
s
u
r
e
r
o
l
l
e
r
o
f
t
h
e
f
u
s
e
r
u
n
i
t
7
8
.
5
m
m
A mm
A mm
A mm
A mm
White dots repeat in A mm distance on
the black page with printed images.
Black dots repeat in A mm
distance on the page.
< Examples of image distortion >