Brother MFC-9420CN Service Manual

Confidential
3-9
[ 2 ] Basic structure of the printing system
A toner image is formed through the potential of the OPC belt varying in each of the charger,
exposure, development, transfer and cleaning processes.
(1) Process of Print System (See Fig.3-10.)
1) The OPC belt is biased to the voltage -CBV(V) by the power supply CBV.
2) A negative high voltage is applied to the charger unit by the power supply CHV, and a
corona is generated as the result.
3) The developer magnetic roller of the toner cartridges is biased to -DBV(V) by the power
supply DBV.
4) The frame potential of the transfer drum is GND.
Fusing Unit FU
Paper Tray PU
OPC Belt
Erase Lamp
PU
Cleaning
Blade
Laser Assy PU
Cleaning Roller PU
Back Cover Assy PU
Transfer Belt
Transfer Roller
Paper Feed
Roller PU
Developer Roller
Registration Roller PU
OPC
Charger
Roller PU
Transfer Unit
Belt Cartridge PU
Toner Cartridge PU
Drum GND
Fig. 3-10

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