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Brother MFC-9420CN Service Manual

Brother MFC-9420CN
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Confidential
9-25
I-1 Background
Phenomenon
Background is smeared due to toner spread as shown in print sample [1] of Fig.9-1.
Main Causes
(1) Too small charging amount in the development process.
(2) Insufficient contact of the developer roller's bias pole.
(3) Life or failure of the belt cartridge PU.
(4) Failure of the HV power supply unit PU (HVU).
Fig. 9-2
Countermeasures
(1) Replace the toner cartridge PU.
(2) Confirm if the developer bias pole is deformed or not.
(3) Replace the belt cartridge PU.
(4) Replace the HV power supply unit (HVU).
Belt cartridge PU
Toner cartridge PU
(K, Y, M, C)
OPC belt

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Brother MFC-9420CN Specifications

General IconGeneral
Print technologyLaser
Maximum resolution1200 x 2400 DPI
Economical printingYes
Print speed (black, normal quality, A4/US Letter)31 ppm
Print speed (color, normal quality, A4/US Letter)8 ppm
Digital senderNo
Number of print cartridges4
Scanner typeFlatbed scanner
Scanner featuresScan to: e-mail, image, OCR, file
Copier resize25 - 400 %
Maximum copy resolution600 x 600 DPI
Maximum number of copies99 copies
Copy speed (black, normal quality, A4)31 cpm
Copy speed (color, normal quality, A4)8 cpm
FaxingColor faxing
Fax memory500 pages
Modem speed33.6 Kbit/s
Fax speed dialing (max numbers)200
Total input capacity750 sheets
Maximum input capacity250 sheets
Auto document feeder (ADF) input capacity35 sheets
Maximum internal memory576 MB
Bundled softwareScanSoft PaperPort Presto! PageManager
I/O portsIEEE-1284 USB 2.0
Dimensions (WxDxH)483.5 x 514 x 530 mm
Printer managementBRAdmin Professional, MIB-II
Networking features10Base-T/100Base-TX
All-in-one functionsFax, Scan
Color all-in-one functionscopy, fax, print, scan
Compatible operating systemsWindows 98(SE)/ Me/ NT WorkStation 4.0/ 2000 Professional/ XP Mac OS 9.1 - 9.2, Mac OS X 10.2.4+
Sustainability certificatesENERGY 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 positioningBusiness

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