Brother International HL-3400CN Service Manual - Page 312
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CHAPTER 8 TROUBLESHOOTING 1-13 White Band Phenomenon White banding line appears in the horizontal direction, and consequently causes a missing image as shown in print sample (13) of Page 8-45. Main Causes (1) Installation failure of the transfer unit, and deformation of the transfer roller. (2) Contact failure of the transfer roller bias pole. (3) TR cam clutch failure. Countermeasures (1) Confirm if the transfer unit is properly locked in position and that both ends of the transfer unit are held by the hooks. (2) Confirm if the transfer unit is properly installed or not. (3) Replace the TR cam clutch with a new one. (See Section 4.1.7 of Chapter 7.) (4) Replace the transfer unit with a new one. (See Section 4.6.1 of Chapter 7.) 8-54
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CHAPTER
8
TROUBLESHOOTING
1-13
White
Band
Phenomenon
White
banding
line
appears
in
the
horizontal
direction,
and
consequently
causes
a
missing
image
as
shown
in
print
sample
(13)
of
Page
8-45.
Main
Causes
(1)
Installation
failure
of
the
transfer
unit,
and
deformation
of
the
transfer
roller.
(2)
Contact
failure
of
the
transfer
roller
bias
pole.
(3)
TR
cam
clutch
failure.
Countermeasures
(1)
Confirm
if
the
transfer
unit
is
properly
locked
in
position
and
that
both
ends
of
the
transfer
unit
are
held
by
the
hooks.
(2)
Confirm
if
the
transfer
unit
is
properly
installed
or
not.
(3)
Replace
the
TR
cam
clutch
with
a
new
one.
(See
Section
4.1.7
of
Chapter
7.)
(4)
Replace
the
transfer
unit
with
a
new
one.
(See
Section
4.6.1
of
Chapter
7.)
8-54