Brother MFC-9420CN Service Manual

6-10 Confidential
6.4.2 Replacement of Fusing Unit
<Criterion of Replacement>
It is recommended to replace with a new fusing unit according to the periodic maintenance cycle
listed in the Table 6-1 to maintain the satisfactory print quality.
The suggested replacement timing is indicated on the control paned with the following message,
“REPLACE FUSER”.
Replace Fuser
<Purpose of Replacement>
To prevent the decline of fusing strength and print quality due to the deterioration of the fuser
roller.
<Tools and Replacement Materials>
Fusing unit (1 unit): Voltage specification to be confirmed.
WARNING
• Fusing unit and its peripheral parts are very hot.
• Prior to starting the replacement work, leave the machine for approx. ten minutes while the
power supply of the machine is ON. Then, turn it off and check that the unit and parts are well
cooled down.
<Work Procedure>
Sequence of Disassembling
(1) Turn off the machine’s power switch. To avoid injury, wait until the machine has cooled
down sufficiently before you replace the fusing unit.
(2) Open the back cover and the scanner unit of the machine.
Fig. 6-9
Scanner unit
Back cover

Brother MFC-9420CN Specifications

General

Print technology	Laser
Maximum resolution	1200 x 2400 DPI
Economical printing	Yes
Print speed (black, normal quality, A4/US Letter)	31 ppm
Print speed (color, normal quality, A4/US Letter)	8 ppm
Digital sender	No
Number of print cartridges	4
Scanner type	Flatbed scanner
Scanner features	Scan to: e-mail, image, OCR, file
Copier resize	25 - 400 %
Maximum copy resolution	600 x 600 DPI
Maximum number of copies	99 copies
Copy speed (black, normal quality, A4)	31 cpm
Copy speed (color, normal quality, A4)	8 cpm
Faxing	Color faxing
Fax memory	500 pages
Modem speed	33.6 Kbit/s
Fax speed dialing (max numbers)	200
Total input capacity	750 sheets
Maximum input capacity	250 sheets
Auto document feeder (ADF) input capacity	35 sheets
Maximum internal memory	576 MB
Bundled software	ScanSoft PaperPort Presto! PageManager
I/O ports	IEEE-1284 USB 2.0
Dimensions (WxDxH)	483.5 x 514 x 530 mm
Printer management	BRAdmin Professional, MIB-II
Networking features	10Base-T/100Base-TX
All-in-one functions	Fax, Scan
Color all-in-one functions	copy, fax, print, scan
Compatible operating systems	Windows 98(SE)/ Me/ NT WorkStation 4.0/ 2000 Professional/ XP Mac OS 9.1 - 9.2, Mac OS X 10.2.4+
Sustainability certificates	ENERGY STAR
Power consumption (standby)	85 W
Power consumption (PowerSave)	16 W
Power consumption (average operating)	1090 W
Operating temperature (T-T)	10 - 32 °C
Operating relative humidity (H-H)	20 - 80 %
Market positioning	Business