Troubleshooting
4-12
Samsung Electronics
Vertical black line and band
YES
NO
YES
OK after
replacing the LSU?
Remove part on the paper
path causing the trouble
NO
OK after replacing
developer?
Any obstacles on
the developer blocking
the laser beam.
OK after
removing the
obstacles?
Any obstacles ON
mirror lens of LSU and
laser path?
Remove the obstacles.
Replace the LSU
Replace the developer
END
YES
YES
YES
NO
NO
NO
4-6 Troubleshooting Flow Chart