Horizontal Band Printheads Out - Lexmark W850n Service Manual

Horizontal band printheads out

Leading edge
Trailing edge
Step Check
1 Check the media condition.
Load new, dry, and recommended media.
Re-print the defective image.
Does the error continue?
2 Are the media transfer route and the media path free of
contamination and 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.
Check the transfer roll assembly for rotation,
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 contamination or cracking on the heat roll and/or
the pressure roll?
7 Check the image development process.
Perform a print test. Turn off the printer power while
printing.
Carefully remove the PC 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 easy to read?
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.
Go to step 6. Go to step 9.
Replace the Go to step 7.
fuser unit
assembly.
Go to step 8. Go to step 9.
Diagnostic information
4024-110
2-89