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Brother MFC-9420CN Service Manual

Brother MFC-9420CN
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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

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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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