Lexmark W850n Service Manual page 112

4024-110
Step Check
7 Check the laser beam route.
Check for debris between the transfer roll assembly and
the PC drum.
Check the printhead assembly window for
contamination.
Is there any debris in the laser beam route or the
printhead assembly window?
8
Is there contamination or cracking on the heat roll and/or
pressure roll?
9 Check the printer engine card assembly.
Replace the printer engine card assembly.
Perform a print test.
Does the error continue?
2-92
Printer Service Manual
Check the heat roll and pressure roll.
Remove the fuser unit assembly.
Yes No
Go to step 8. Remove debris,
or clean the
transfer roll
assembly
window.
Replace the Go to step 9.
fuser unit
assembly.
Replace the RIP Problem solved.
card assembly.
Go to "RIP card
assembly
removal" on
page 4-126.