HL-5240/5250DN/5270DN/5280DW SERVICE MANUAL
Confidential
4-49
(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.)
Yes
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?
Yes
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 o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
Print out test print out test print out test Print out test print o
Print out test print o
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.