Image Quality - Lexmark MB790MFP Service Manual

Image Quality

Faint print (Low contrast)
Leading edge
Trailing edge
Before starting, check the media route for foreign objects, such as staples, clips, and scraps, in the media path.
Step
1 Check the media condition.
Load new, dry, recommended media, and perform a print
test.
Is the image density normal?
2 Check the toner level.
Is the toner level normal?
3
Check the transfer roll assembly for contamination and
wear.
Is the above component free of excess wear and
contamination?
4
Check the print cartridge for proper installation.
Is the print cartridge properly installed?
5 Check the laser beam route.
Check for debris between the printhead assembly and
the PC drum.
Is the laser beam route free of debris and the glass
window, in the printhead assembly, free of
contamination?
6
Check the HVPS card assembly for proper connection.
Is the above component properly connected?
Check Yes No
Problem solved. Go to step 2.
Go to step 3. Replace the
print cartridge.
Go to step 4. Replace the
transfer roll
assembly.
Go to "Transfer
roll assembly
removal" on
page 4-56.
Go to step 5. Inspect, clean
and reinstall
replace the print
cartridge.
Go to step 6. Remove debris
or clean the
printhead
assembly
window.
Replace the Replace the
HVPS card connections.
assembly. Go to
"HVPS card
assembly
removal" on
page 4-17.
Diagnostic information
7462
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