Brother MFC-8860DN Service Manual

Confidential
3-21
When the new toner detection switch 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.
Toner property Actual control
[Used toner amount] [Used toner amount]
Print density
Bias voltage
Bias voltage
Print density
[Density]
[Voltage]
[Density]
[Voltage]
Fig. 3-22
To always obtain a print result of a constant density, 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.
3.2.4.3 Counter reset during indication of “Toner Life End”
The counter resetting method during indication of “Toner Life End” depends on the cause of toner
life end and the condition of the inserted toner cartridge. Refer to the following table for details.
Toner Life End (Toner empty)
Toner Life End
(Developer count full)
When a used toner is
inserted (Reset gear is at the
position of in use.)
Toner exchange count: +0
Page counter of each toner: Continued
Coverage of each toner: Continued
Development bias: Reset (Default)
Not used.
When a new toner is inserted
(Reset gear is at the position
of factory set.)
Toner exchange count: +1
Page counter of each toner: Reset (0)
Coverage of each toner: Reset (0)
Development bias: Reset (Default)

Brother MFC-8860DN Specifications

General

Duplex printing	Yes
Print technology	Laser
Maximum resolution	1200 x 1200 DPI
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	28 ppm
Scan to	e-mail, file, image, OCR
Grayscale levels	256
Input color depth	48 bit
Copier resize	25 - 400 %
Maximum copy resolution	1200 x 600 DPI
Maximum number of copies	99 copies
Copy speed (black, normal quality, A4)	28 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
Maximum internal memory	544 MB
Sound power level (standby)	30 dB
Sound pressure level (printing)	55 dB
Display	LCD
Market positioning	Business
Paper tray media types	Envelopes, Plain paper, Recycled paper
Non-ISO print media sizes	Executive
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
Maximum ISO A-series paper size	A4
Font styles	66 Scaleable fonts, Letter, Gothic 16.66, OCR-A, OCR-B, 11 Barcodes
Dimensions (WxDxH)	531 x 450 x 475 mm
Networking features	10/100 Base-TX
All-in-one functions	Copy, Fax, Scan
Color all-in-one functions	scan, n
Compatible operating systems	Windows98(SE)/Me/2000/XP/NT4.0WS Mac OS 9.1-9.2/ OS X 10.2.4 +
Standard interfaces	USB 2.0
Power consumption (standby)	85 W
Power consumption (PowerSave)	15 W
Power consumption (average operating)	1104 W
Sustainability certificates	ENERGY STAR