Brother International HL-3400CN Service Manual - Page 318

Brother International HL-3400CN - Color Laser Printer Manual

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CHAPTER 8 TROUBLESHOOTING 1-23 White Print Phenomenon A blank page (no print at all) is output or a specific color is missing (not printed) as shown in print sample (23) of Page 8-46. Main Causes (1) Laser light path is blocked by paper or other material stuck at the opening of the laser unit. (2) The TR cam clutch is broken (not functioning). (3) There is no belt bias voltage (CBV). (4) There is no output from the high-voltage power supply unit (HVU) due to breakdown. Countermeasures (1) Confirm that there are no foreign objects stuck in the opening of the laser unit. (2) Replace the TR cam clutch with a new one. (See Section 4.1.7 of Chapter 7.) (3) Replace the OPC belt cartridge with a new one. (See Section 4.1 of Chapter 6.) (4) Replace the high-voltage power supply unit with a new one. (See Section 4.3.2 of Chapter 7.) 1-24 Insufficient Fusing Phenomenon Printed image is partially missing as shown in print sample (24) of Page 8-46. This proves that the fusing is insufficient. Main Causes (1) Wrong selection of print media (label or envelope, etc.) at the Host (driver) side. (2) Recommended paper is not being used. (3) Double-feed paper. (4) Failure of the fusing unit. Countermeasures (1) Adjust the mode of Host side to suit the print media in use. (2) Use the recommended paper. (3) Fan the paper before loading in the media cassette. (4) Replace the failed fusing unit with a new one. (See Section 4.2 of Chapter 6.) 8-60

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CHAPTER
8
TROUBLESHOOTING
1-23
White
Print
Phenomenon
A
blank
page
(no
print
at
all)
is
output
or
a
specific
color
is
missing
(not
printed)
as
shown
in
print
sample
(23)
of
Page
8-46.
Main
Causes
(1)
Laser
light
path
is
blocked
by
paper
or
other
material
stuck
at
the
opening
of
the
laser
unit.
(2)
The
TR
cam
clutch
is
broken
(not
functioning).
(3)
There
is
no
belt
bias
voltage
(CBV).
(4)
There
is
no
output
from
the
high
-voltage
power
supply
unit
(HVU)
due
to
breakdown.
Countermeasures
(1)
Confirm
that
there
are
no
foreign
objects
stuck
in
the
opening
of
the
laser
unit.
(2)
Replace
the
TR
cam
clutch
with
a
new
one.
(See
Section
4.1.7
of
Chapter
7.)
(3)
Replace
the
OPC
belt
cartridge
with
a
new
one.
(See
Section
4.1
of
Chapter
6.)
(4)
Replace
the
high
-voltage
power
supply
unit
with
a
new
one.
(See
Section
4.3.2
of
Chapter
7.)
1-24
Insufficient
Fusing
Phenomenon
Printed
image
is
partially
missing
as
shown
in
print
sample
(24)
of
Page
8-46.
This
proves
that
the
fusing is
insufficient.
Main
Causes
(1)
Wrong
selection
of
print
media
(label
or
envelope,
etc.)
at
the
Host
(driver)
side.
(2)
Recommended
paper
is
not
being
used.
(3)
Double
-feed
paper.
(4)
Failure
of
the
fusing
unit.
Countermeasures
(1)
Adjust
the
mode
of
Host
side
to
suit
the
print
media
in
use.
(2)
Use
the
recommended
paper.
(3) Fan
the
paper
before
loading
in
the
media
cassette.
(4)
Replace
the
failed
fusing
unit
with
a
new
one.
(See
Section
4.2
of
Chapter
6.)
8-60