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C7350/7550 User’s Guide: Troubleshooting • 524
Print Quality Problems
Stripes: White
The stripes appear in the same direction as the paper was
printed (moved through the printer).
Stripes: Black
The stripes appear in the same direction as the paper was
printed (moved through the printer).
Possible cause Remedy
LED head is dirty. Clean LED head with lens cleaner or soft tissue.
See “Cleaning the LED heads” on page 502.
Toner is low. Change toner cartridge.
See “Changing the Toner Cartridge” on page 484.
Image drum
damaged.
Change image drum.
See “Changing the Image Drum” on page 491.
Possible cause Remedy
Image drum is
damaged.
Replace image drum.
“Changing the Image Drum” on page 491.
Toner is low. Change toner cartridge.
See “Changing the Toner Cartridge” on
page 484.
Periodic black lateral
lines or spots.
• If the lines or spots occur at intervals of
approximately 44 - 94 mm, the image drum
(green tube) is damaged or dirty.
If damaged, replace the image drum cartridge.
If dirty, wipe the image drum gently with soft
tissue. If this does not work, replace the image
drum.
• If the lines or spots occur at intervals of
approximately 113 mm, the fuser roller is
damaged. Change the fuser unit.
See “Changing the Fuser” on page 499.
The image drum has
been exposed to
light.
Remove the image drum from the printer and
store it in a dark place for several hours. If this
does not work, replace the image drum.