172 Chapter 9 Image quality EN
• The toner cartridge is defective.
• The toner cartridge is not seated properly.
• The fusing assembly is contaminated or damaged.
• The static eliminator teeth are contaminated or defective
• The imaging drum is damaged or the waste toner collection in the
drum is full. Replace the imaging drum.
• Check for poor contact between the drum cartridge contact (for
primary charging bias) and the primary charging bias contact. To
improve the contact, clean the contacts. If the problem persists after
cleaning or the contacts are deformed or damaged, replace them. If
the contacts have slipped off, adjust them correctly.
• Check the drum cartridge (primary charging roller). If defective,
replace the drum cartridge.
• Check for poor contacts in the connectors. Reconnect the DC
controller PCB connector and the high-voltage PCB 2 connector
correctly.
• Check for a defective high-voltage PCB (primary charging bias
output shortage). If defective, replace the high-voltage PCB 2.
• Check for a defective DC controller PCB. If defective, replace the
DC controller PCB.
• If ITB clutch was removed, check for proper timing.
• The black toner cartridge is empty.
• Make sure clutch CL2 is connected (plugged into the paper PCA).
• This defect can be caused by improper timing on the ITB clutch
gears. Make sure that the cams are in sync. The two white gears on
the left side of the printer should have two timing marks pointing
toward each other.
– Cams with a single line should be off one tooth clockwise on the
right gear.
– Cams with a double line should be aligned.
Black lines
Black or partially black pages
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