Brother MFC-9440CN Service Reference Manual

Confidential
Ref. 2-18
<Developing Bias Voltage>
When the new toner detection mechanism detects the change to a new toner cartridge, the
developing bias voltage is reset. Toner in use tends to have a low printing density at the time
of first use, but the density gradually becomes higher after a certain period of use.
The properties of the toner is controlled by means of the developing bias voltage. The values
are varied according to counts of the amount of toner used immediately after a toner cartridge
is changed so that excellent print quality of even contrast can be obtained constantly from the
printing start time to the stop time. In addition, the developing bias voltage of all the toner
cartridges are periodically corrected so as to eliminate variation in the density of the four
colors.
Fig. Ref2-14
Memo:
If a toner cartridge in use is changed to a cartridge which has previously been in use, the
developing bias voltage will become incorrect to the change color density. Toner cartridges
being used must not be replaced with other ones. As this will cause print defects.
[Used toner amount]
Developing bias voltage
Print density
Actual control
[Density]
[Voltage]

Brother MFC-9440CN Specifications

General

Print technology	Laser
Maximum resolution	2400 x 600 DPI
Time to first page (color, normal)	16 s
Print speed (black, normal quality, A4/US Letter)	20 ppm
Scan to	e-mail, file, image, OCR
Input color depth	48 bit
Copier resize	25 - 400 %
PC free copying	Yes
Maximum copy resolution	1200 x 600 DPI
Maximum number of copies	99 copies
N-in-1 copy function (N=)	2, 4, 9, 16
Copy speed (black, normal quality, A4)	16 cpm
Faxing	Color faxing
Fax memory	400 pages
Modem speed	33.6 Kbit/s
Fax speed dialing (max numbers)	300
Total input capacity	250 sheets
Total output capacity	150 sheets
Multi-Purpose tray input capacity	50 sheets
Auto document feeder (ADF) input capacity	35 sheets
Internal memory	64 MB
Maximum internal memory	576 MB
Sound power level (standby)	30 dB
Sound pressure level (printing)	54.5 dB
Display	LCD
Market positioning	Business
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Legal (media size), Letter (media size)
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
JIS B-series sizes (B0...B9)	B5
Maximum ISO A-series paper size	A4
Font styles	66 Scaleable fonts, 12 Bitmap fonts, 13 Barcodes
Dimensions (WxDxH)	432 x 487 x 482 mm
Networking features	10/100 Base-TX
All-in-one functions	Copy, Fax, Scan
Color all-in-one functions	copy, fax, print, scan
Compatible operating systems	Windows Vista/XP/Home/2003/2000 Mac OS X 10.2.4 or greater Linux
Standard interfaces	USB 2.0
Power consumption (standby)	95 W
Power consumption (PowerSave)	28 W
Power consumption (average operating)	495 W
Package weight	38600 g
Sustainability certificates	ENERGY STAR
Digital sender	No