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Brother MFC-9420CN Service Manual

Brother MFC-9420CN
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Confidential
9-48
I-24
Uneven Density (Right & Left)
Phenomenon
The optical density is different between the right and left side of the printed image.
Main Causes
(1) The amount of toner in the toner cartridge PU is short.
(2) The retract operation of the toner cartridge PU is not properly done.
(3) The belt of the toner cartridge PU is deformed.
(4) The belt of the transfer unit is deformed.
(5) The transfer roller ASSY PU is not properly installed.
(6) The back cover ASSY PU is deformed.
(7) The back cover ASSY PU is not locked sufficiently
(8) The dustproof glass of laser ASSY PU is stained.
Fig. 9-24
Countermeasures
(1) Replace the toner cartridge PU.
(2) Check the toner retract clutch PU.
(3) Replace the belt cartridge PU.
(4) Confirm the proper installation of the transfer roller ASSY PU.
(5) Replace the transfer roller ASSY PU.
(6) Ensure to lock the back cover ASSY PU.
(7) Replace the back cover ASSY PU.
(8) Clean the laser ASSY PU.
(9) Replace the laser ASSY PU.
Toner cartridge PU
(K, Y, M, C)
Laser ASSY PU
Belt cartridge PU
Transfer unit PU
Transfer belt
Back cover ASSY PU

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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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