Brother Facsimile Equipment MFC7420 - Manual (Page 226)

Confidential 9-38
I-13 Image distortion
Possible cause Step Check Result Remedy
Laser unit
installation 1 Is the laser unit secured to
the frame incorrectly?
(Check if there is any
play.) No Secure the unit correctly and
tighten the screws.
Scanner LD
emission
failure
Scanner motor
rotation
failure 2 Is the laser diode or the
scanner motor defective? No Replace the laser unit.
Scanner
connection
failure 3 Is the scanner harness
connected properly?
(Check if it is coming
loose.) No Connect the harness correctly.
I-14 Faint print
Print out test print out test print out test Print out test print o Print out test print out test print out test Print out test print o Print out test print o
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Possible cause Step Check Result Remedy
Printer
installation 1 Is the printer placed
horizontally? No Place the printer on a flat surface.
Toner
cartridge 2 Does the problem happen
immediately after replacing
the toner cartridge with a
new one? Yes Remove and carefully shake the
toner cartridge horizontally.
Scanner
window dirty 3 Is the scanner window
dirty? Yes Clean the scanner window with a
soft dry cloth.
Laser unit
failure 4 Is the problem solved by
replacing the laser unit? Yes Replace the laser unit.