Brother MFC-8880DN Service Manual

2-26
Confidential
When the new toner detection machanism detects that the toner cartridge is replaced with a
new one, the developing bias voltage is initialized at the same time.
The toner used for the machine has a property that print density is light first and gradually
darker in the course of usage. The developing bias controls the toner property so that the
print density is constant from first to last.
To obtain a print result of a constant density all the time, the machine counts the number of
print pages immediately after the toner cartridge is replaced and changes the bias voltage
according to the accumulated number of prints with the toner cartridge.
The bias voltage is changed with the steps described below:
(1) When the new toner sensor detects that the toner cartridge is replaced with a new (full)
one, the developing bias is set to 400V (initialized).
(2) After that, the bias voltage is stepped down according to the number of prints. Ultimately,
the bias voltage is approximately 300V.
<When a new toner cartridge is inserted after "Replace Toner" is displayed>
Corresponding counter, Setting value Operation
Counter of toner cartridge changes +1
Page counter for each toner cartridge Reset (0)
Coverage for each toner cartridge Reset (0)
Developing bias voltage Reset (Initial setting)
[Used toner amount]
[Density]
[Voltage]
[Used toner amount]
[Density]
[Voltage]
Bias voltage
Toner property Actual control
Print density
Bias voltage
Print density

Brother MFC-8880DN Specifications

General

Print technology	Laser
Maximum resolution	1200 x 1200 DPI
Economical printing	Yes
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	30 ppm
Scan to	E-mail, E-mail Server, File, FTP, Image, OCR, USB
Scanner type	Flatbed & ADF scanner
Grayscale levels	256
Input color depth	24 bit
Maximum scan resolution	19200 x 19200 DPI
Optical scanning resolution	600 x 2400 DPI
Copier resize	25 - 400 %
Maximum copy resolution	1200 x 600 DPI
Maximum number of copies	99 copies
N-in-1 copy function (N=)	2, 4, 9, 16
Time to first copy (black, normal)	10.5 s
Copy speed (black, normal quality, A4)	30 cpm
Faxing	Mono faxing
Fax memory	500 pages
Modem speed	33.6 Kbit/s
Fax speed dialing (max numbers)	300
Total input capacity	250 sheets
Total output capacity	150 sheets
Auto document feeder (ADF) input capacity	50 sheets
Internal memory	64 MB
Card reader integrated	No
Sound power level (standby)	30 dB
Sound pressure level (printing)	56 dB
Display	LCD
Market positioning	Business
Dimensions (WxDxH)	531 x 451 x 475 mm
All-in-one functions	Copy, Fax, Print, Scan
Maximum internal memory	0.576 GB
Color all-in-one functions	Scan
Maximum print size	216 x 356 mm
Paper tray media types	Plain paper, Recycled paper
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
Maximum ISO A-series paper size	A4
Standard interfaces	Ethernet
USB 2.0 ports quantity	1
AC input frequency	50 - 60 Hz
Power consumption (standby)	85 W
Power consumption (PowerSave)	18 W
Power consumption (average operating)	680 W
Maximum duty cycle	- pages per month
Package weight	22100 g
Mac operating systems supported	Mac OS X 10.3 Panther, Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion
Server operating systems supported	Windows 2000 Advanced Server, Windows 2000 Server, Windows Server 2003, Windows Server 2003 x64, Windows Server 2008, Windows Server 2008 R2, Windows Server 2008 x64
Windows operating systems supported	Windows 2000, Windows 2000 Professional, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Ultimate, Windows Vista Business, Windows Vista Business x64, Windows Vista Home Basic, Windows Vista Home Basic x64, Windows Vista Home Premium, Windows Vista Home Premium x64, Windows Vista Ultimate, Windows Vista Ultimate x64, Windows XP Home, Windows XP Home x64, Windows XP Professional, Windows XP Professional x64