Brother HL-5450DN Service Manual

2-77
Confidential
4.8 Troubleshooting for Fuser Unit Problems
4.8.1 Fuser unit failure
Step Cause Remedy
1
Harness connection failure
between fuser unit and eject sensor
PCB
Check the harness connection between the
fuser unit and the eject sensor PCB, and
reconnect it if necessary.
2
Harness connection failure
between fuser unit and low-voltage
power supply PCB
Check the harness connection between the
fuser unit and the low-voltage power supply
PCB, and reconnect it if necessary.
3
Connection failure of the eject
sensor harness
Check the connection of the eject sensor
harness, and reconnect it if necessary.
4
Eject sensor PCB failure Refer to "1.3.8 Check sensor operation
(function code: 32)" in Chapter 5 to check
the sensor operation. If the sensor operation
is faulty, replace the eject sensor PCB
ASSY.
5
Low-voltage power supply PCB
failure
Replace the low-voltage power supply PCB
ASSY.
6 Fuser unit failure Replace the fuser unit.
7 Main PCB failure Replace the main PCB ASSY.
CAUTION:
• Turn the power switch OFF and then ON again. Leave the machine for ten minutes.
This problem may then be cleared.
• The machine may recover from the error, when fuser unit inspection print is conducted
after the following operation: Open the cover, and turn the power switch ON while
pressing the [Go] button, then press the [Go] button one time, and then press the [Go]
button three times. However, conducting this operation while the heater has not yet
cooled may cause the fuser unit to melt. Be careful.

Brother HL-5450DN Specifications

General

Color	No
N-up printing	2, 4, 9, 16, 25
Duplex printing	Yes
Print technology	Laser
Maximum resolution	2400 x 600 DPI
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	38 ppm
Duplex print speed (black, normal quality, A4/US Letter)	9 ppm
Maximum duty cycle	- pages per month
Recommended duty cycle	1000 - 3500 pages per month
Number of print cartridges	1
Memory type	DDR2
Processor family	Star Sapphire
Maximum internal memory	320 MB
Sound power level (standby)	34 dB
Sound pressure level (printing)	59 dB
Sound pressure level (quiet mode)	54 dB
Total input capacity	250 sheets
Total output capacity	150 sheets
Maximum input capacity	800 sheets
Total number of input trays	2
Multi-Purpose tray input capacity	50 sheets
Custom media width	76.2 - 215.9 mm
Maximum print size	216 x 356 mm
Custom media length	127 - 355.6 mm
Paper tray media types	Plain paper, Recycled paper
Paper tray media weight	60 - 105 g/m²
Non-ISO print media sizes	Letter
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
Multi-purpose tray media types	Bond paper, Envelopes, Heavyweight paper, Labels, Plain paper, Recycled paper
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 163 g/m²
Standard interfaces	Ethernet, USB 2.0
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
AC input voltage	220 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (off)	0.41 W
Power consumption (standby)	4.7 W
Power consumption (printing)	665 W
Power consumption (PowerSave)	0.6 W
Package weight	11.900 g
Sustainability certificates	ENERGY STAR

Weight and Dimensions

Dimensions (WxDxH)	371 x 384 x 245 mm