Brother MFC-9420CN Service Manual

Confidential
3-19
7 Second Transfer (Paper)
Second transfer process means that the toner image on the transfer belt is transferred onto the
transported paper.
(1) Structure of belt cleaning
1) Transfer roller for the second transfer is located as shown in Fig.3-9.
2) Transfer roller is normally separated from the transfer belt.
3) Transfer roller is positively biased by the power supply THV.
4) Transfer roller contacts to the transfer belt in the second transfer process.
5) Transported paper passes between the transfer roller and transfer belt.
(2) Process of belt cleaning (Refer to Fig.3-22.)
1) Paper is transported as synchronizing with the transfer belt.
2) Transfer roller operates as synchronizing with the transported paper, and contacts
with the transfer belt through the transported paper.
3) Transported paper passes between the transfer roller and transfer belt. In this instance,
the positive high voltage (THV) is injected to the transfer roller.
4) Negatively charged toner is moved to the positively charged paper.
5) Transported paper with the toner transferred is transported to the paper discharging
process.
Transfer Roller
Paper
THV: Power Supply for Transfer
Roller Bias.
+THV
Transfer Belt
Registration Roller
Transfer Unit
Fig. 3-22

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