Lexmark 7003-050 X340n, Service Manual

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Diagnostic information
2-33
7003-XXX
Light print
White or black lines or bands
Toner on back of page
FRU Action
Toner cartridge (not a FRU) Make sure the toner cartridge and PC Kit are installed correctly and
that the toner cartridge is not low on toner.
If the problem continues, install a new toner cartridge.
Recheck condition before replacing PC Kit if necessary.
Transfer roll
LVPS/HVPS board
Check the transfer roll for signs of toner buildup and contamination.
Inspect the HVPS contact (transfer roll) for contamination.
Verify the high voltage cable is plugged into the LVPS/HVPS.
If all components appear free of contamination, replace the following
FRUs one at a time in the order shown:
• Transfer roll
• LVPS/HVPS board
FRU Action
Print cartridge assembly (not a FRU)
Developer drive coupling assembly
Banding appears as light or dark horizontal lines on a uniformly
gray page or on a page with a large area of graphics. Banding is
primarily due to a variation in the speed of the paper as it feeds
through the MFP, especially in the developer and transfer process.
Inspect the toner cartridge and paper feed components, especially
the drive coupler and drive gears for debris, binds, or damage.
FRU Action
PC Kit (not a FRU) Inspect the overall paper path for signs of spilled toner.
Gently clean the contaminated areas with a soft cloth or compressed
air.
Fuser The fuser hot roll can cause toner deposits on the back of the paper if
toner is building up on the hot roll. This buildup may transfer to the
backup roll, later transferring to the back of the paper.
Inspect the hot roll and backup roller for signs of contamination.
Replace the fuser as necessary.
Transfer roll A transfer roll contaminated with toner can cause toner to transfer to
the back of printed pages.
Inspect the transfer roll for contamination, and replace as necessary.
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