Brother MFC-9420CN Service Manual

Confidential
3-41
3.3.3 Main PCB (Video Controller PCB)
[ 1 ] Outline
The main PCB consists of the circuits which perform the following functions;
• Receive the printing data from the computer.
• Convert the received data to the bitmap data such as characters or graphics.
• Control the engine and send the generated bitmap data as a video signal.
The control panel is controlled by communicating with the engine CPU to display LCD messages,
light the LEDs and display the button status, etc.
The power for the main PCB is supplied from the engine through the engine interface connector.
[ 2 ] Circuit
(1) CPU
• Model name: VR5500, core
MIPS 64bit RISC CPU manufactured by NEC
• Clock speed: 89MHz (external) / 266MHz (internal)
• Cache memory: 32KB (Command cache) / 32KB (Data cache)
• Bus width: 32bit (external) / 64bit (internal)
Internal Floating Point Unit (FPU)
(2) ASIC block
• Model name: PD800268F1 manufactured by NEC
• Appearance: 316pin BGA
• Functions:
* Controls CPU
* Controls memory
* Controls interrupts
* Timer
* External interfaces (Centronics, PCI, IDE, Compact Flash, USB)
* Engine interface (Video signal control, LVDS)
* Supports Software
(3) ROM block
The ROM stores the CPU control program and font data. ROMs used are an 16Mbytes flash
ROM, and an 8 Mbytes flash ROM which can be rewritten on the board.
<Masked ROM>
• Model name: S29GL128N90TFIR20H
• Access time: less than 90nsec.
• Appearance: 56pin TSOP
<Flash ROM>
• Model name: S29GL064M90TCIR20 manufactured by SPANSION
• Access time: less than 90nsec.
• Appearance: 48-pin TSOP

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