Brother MFC-9420CN Service Manual

Confidential
3-10
(2) Variation of OPC Belt Potential (See Fig.3-11.)
1) The OPC belt is initially biased to -CBV(V).
2) The OPC belt surface is evenly charged to V
0
(V) in the charging process.
3) The potential of the exposure part of the OPC belt is reduced to -VR(V) as it is exposed to
the laser beam in the process of exposing, and an electrostatic latent image is formed on
the OPC belt as the result.
4) Negatively charged toner is moved onto the exposed part of the OPC belt in the
development process due to the difference of potential between -VR(V) (the latent image)
and -DBV(V), and a visible toner image is formed as the result.
5) Negatively charged toner on the OPC belt moves to the transfer drum surface in the
transfer process because the GND potential of the transfer drum is greater than -VR(V) of
the OPC belt.
6) The OPC belt is discharged by the erase lamp.
-CBV
-CBV
-CBV
-CBV
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
brother
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-CBV
-CBV
-CBV
-CBV
Charging
Laser Diode
Exposing
Blade
K Y M C
Developing
Transfer Belt
Erase Lamp
OPC Belt
-DBV
-CHV
-CBV
OV
OPC Belt Surface
-CBV
-V0
-VR
OPC Charger Roller PU
Dev Roller
-DBV
(M)TONER
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
Latent Image
Toner Image
brother
brother
Fig. 3-11

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