Brother MFC-9420CN Service Manual

Confidential
3-47
(1) ADF scanning: Document moves across stationary CIS unit
Placing a document face up in the document support activates the document front sensor,
switching to ADF scanning.
The CIS drive mechanism (details below) operates for each scanning command executed.
The CIS unit first moves to the white-level reference film for white level compensation and
then to the ADF scanning position.
The ADF motor then rotates the document pull-in roller to pull the document into the ADF.
The document separation roller feeds the pages one at a time, starting from the top, to the
document feed roller, which rotates to move the page in a curve left, down, and right.
The page is scanned as it passes over the CIS unit. It then leaves the machine face down onto
the document cover. The machine inserts subsequent pages under this one to preserve the
document page order.
(2) Flat-bed scanning: CIS unit moves under stationary document
The user lifts the document cover, places a page (or open book) face down on the glass plate,
and closes the document cover.
The CIS drive mechanism (details below) operates for each scanning command executed.
The CIS unit first moves to the white-level reference film for white level compensation.
It then moves right, scanning as it goes. It returns to its home position after the scan.
CIS drive mechanism
The contact image sensor (CIS) unit rides along the CIS rail driven by the CIS drive belt.
Clockwise motion of the CIS motor moves the unit to the left; counterclockwise motion, to the
right. This unit consists of the document illumination LED array, the self-focus lens array
gathering the light reflected from the scanned image, the CIS PCB converting the light input to
pixel data output, and a glass cover.
The CIS unit can scan the color document. When scanning the color document, the unit turns on
the three-color LED lines of red, green and blue (R, G, B) alternately and illuminates the document.
When scanning the black/white document, it turns on the green LED line only to scan.

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