Brother MFC-9420CN Service Manual

Confidential
3-21
3.2.2 Laser ASSY PU
This machine employs a semiconductor laser diode as a light source. This laser diode is controlled
by the fast switching according to transmitted image data (video signal).
The generated laser light scans over the OPC belt through a polygon mirror and lens, by which
electrostatic latent images will be formed on the OPC belt.
(1) Structure of laser unit (Refer to Fig.3-24.)
Laser ASSY PU is located as shown in Fig.3-24.
Laser ASSY PU consists of following parts;
1 Laser ASSY: Light emitting source incorporating a laser diode.
2 Cylinder Lens: Condenser of laser beam.
3 Polygon Mirror: Hexahedral mirror scanning the laser beam.
4 F-
θ Lens: Focus lens for laser beam.
5 Scanner Motor: Motor to rotate the polygon mirror.
6 Mirror: Reflecting mirror for the laser beam path.
7 LDC: Laser diode control circuit.
8 PD: Photo detector.
9 BTD Mirror: Beam timing detector mirror to guide the laser beam to PD.
8
3
2
1
5
4
6
7
9
Fig. 3-24
(2) Specification:
Specification of laser unit is described as follows:
Item Specifications
Rated Output of Laser Diode 5mW.
Wave Length of Laser Beam Approx.785nm.
Scanning Density 600dpi
Scanning Width 314mm
Rotations Per Minutes of Scanner Motor 35,904rpm
Number of Polygon Mirror Faces 8

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