Brother MFC-9420CN Service Manual

Confidential
9-40
I-16 Mixed Color Image
Phenomenon
Mixed color image appears in the print as shown in print sample [16] of Fig.9-1.
Main Causes
(1) Retract error of the toner cartridge PU.
(2) Retract error of the transfer roller ASSY PU.
(3) Retract error of the transfer belt cleaning roller PU.
Fig. 9-17
Countermeasures
(1) Confirm where the mixed color image is caused.
1) If it is on the OPC belt, the cause is the retract error of the toner cartridge.
2) If it is on the transfer belt, the cause is the retract error of the transfer belt or cleaning
roller.
(2) Replace the toner cartridge retract gear PU or the retract solenoid PU with a new one.
(3) Replace the transfer roller clutch PU with a new transfer roller clutch PU.
(4) Replace the belt cleaning roller solenoid PU with a new belt cleaning roller solenoid PU.
Belt cartridge PU
Toner cartridge PU
(K, Y, M, C)
Cleaning roller PU
Transfer unit PU
Transfer roller ASSY PU

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