Lexmark W850n Service Manual page 120

4024-110
Spots
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.
Is the media route free of contamination or debris?
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 rotating, and free of
contamination and wear?
5 Check the heat roll and the pressure roll.
Remove the fuser unit assembly.
Is there contamination or cracking on the heat roll and/or
the pressure roll?
6 Check the printer engine card assembly.
Replace the printer engine card assembly.
Perform a print test.
Does the error continue?
2-98
Printer Service Manual
Yes No
Go to step 2. Problem solved.
Go to step 3. Remove debris
or
contamination.
Problem solved. Go to step 4.
Go to step 5. Replace the
transfer roll
assembly.
Replace the Go to step 6.
fuser unit
assembly.
Replace the RIP Problem solved.
card assembly.
Go to "RIP card
assembly
removal" on
page 4-126.
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