Lexmark W850n Service Manual page 117

Horizontal stripes
Leading edge
Trailing edge
Step Check
1 Check the media condition.
Load new, dry, recommended media.
Re-print the defective image.
Does the error continue?
2 Check the media transfer route.
Check the media route for contamination or obstacles.
3 Check the toner cartridge.
Install a new toner cartridge.
Re-print the defective image.
Is the image density normal?
4 Check the transfer roll assembly.
Remove the transfer roll assembly.
Is the transfer roll assembly free of contamination and
wear?
5 Check white-band pitch.
Is the white-band pitch approximately 78 mm (heat roll
circumference)?
6 Check the heat roll and pressure roll.
Remove the fuser unit assembly.
Is there any contamination or crack on the heat roll and/
or pressure roll?
7 Check the image development process.
Perform a print test. Turn off the printer power while
printing.
Carefully remove the toner cartridge, and check the
toner image formed on the drum before the transfer roll
assembly.
Is the image completely formed on the drum, and is the
area clear, black, and easily read?
Yes No
Go to step 2. Problem solved.
Go to step 3. Remove
obstacles or
contamination.
Problem solved. Go to step 4.
Go to step 5. Replace the
transfer roll
assembly.
Go to step 9 Go to step 6.
Replace the Go to step 7.
fuser unit
assembly.
Go to step 8. Go to step 9.
Diagnostic information
4024-110
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