Brother MFC-9420CN Service Manual

Confidential
3-13
3 Developing
Developing process means that an electrostatic latent image on OPC belt is made visible with
toner.
(1) Structure of toner cartridge PU (Refer to Fig.3-9 & 3-15.)
1) Toner cartridge PU is located as shown in Fig.3-9.
2) Four toner cartridges are made available from the top to bottom in the order of
specified color as black, yellow, magenta and cyan.
3) Each color toner is loaded in the corresponding toner cartridge PU.
(2) Process of developing (Refer to Fig.3-9, 3-15, 3-16, and 3-17.)
1) Toner adheres to the Dev.roller of toner cartridge PU.
Developing is processed by this Dev.roller contacting the OPC belt surface.
2) Dev.roller has been biased to the potential -DBV(V). Fig.3-16 describes the
relationship established between the potential of toner, the potential -V
0
(V) at the
non-exposed area of OPC belt and the potential -VR(V) at the exposed area of OPC
belt.
3) Developing is processed by the toner adhering to the OPC belt due to the attraction
between the potential of toner and the potential -VR(V) at the exposed area of OPC
belt. (Toner image is formed (visible) on the OPC belt.)
4) On the other hand, no development takes place at the non-exposed area because the
potential of toner and that of OPC belt is identical pole and therefore repels each
other.
Fig. 3-15

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