Brother MFC-9420CN Service Manual

Confidential
3-12
2 Exposing
The exposing process means that the OPC belt surface is exposed to the laser beam to form an
electrostatic latent image.
(1) Structure of Laser ASSY PU
1) Laser ASSY PU is located as shown in Fig.3-9.
2) Luminous source of the laser beam is a semiconductor laser.
3) Scanning is made to laser light on OPC belt as converting the laser beam to the beam
light through lens and reflective mirror to form an electrostatic latent image.
(2) Process of Exposing (Refer to Fig.3-14.)
1) The OPC belt surface has been charged to the potential -Vo(V) in the charging
process.
2) Laser beam is scanned as rectangular to the forwarding direction of OPC belt.
3) High speed switching of laser is made according to the transmitted image data.
4) Charge of the areas radiated by the laser beam is discharged, where the potential is -
VR(V).
5) An invisible electrostatic latent image is formed on the OPC belt as shown in Fig.3-
14.
-V R
-V O
Charging
Exposing
OPC Charger Roller PU
Fig. 3-14

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