Lexmark 2390 003 - B/W Dot-matrix Printer Service Manual page 35

Print Quality Problems
Symptom
No print, but carrier
moves as if printing.
Print density is light.
Uneven print density
across the print line.
Specific dots
missing.
Extra dots or lines
printing.
Scattered ink
smearing, blurred
characters.
Fuzzy print.
Action
Adjust the form thickness lever to a lower number.
Be sure the printhead cables are not loose or
damaged.
Be sure the interface cable is connected properly.
Be sure the serial interface adapter is installed
correctly and the dip switches are set correctly.
Check the ribbon cartridge for binds or damage.
Go to the "Print Speed Service Check" on page
2-34.
Verify that the ribbon density control knob on the
ribbon cartridge is not set to 0.
If the ribbon has reached its end of life or is worn,
the ribbon cartridge needs to be replaced.
Go to the "Carrier Drive, Home Position Sensor,
Ribbon Feed Service Check" on page
Be sure the printhead cables are connected
correctly to the printhead and the sub logic board.
Clean the printhead.
Set the form thickness lever to position "1" and run
the print test.
Go to the "Carrier Drive, Home Position Sensor,
Ribbon Feed Service Check" on page
Clean the printhead nose.
Clean the ribbon guide and shield.
If the ribbon has reached its end of life or is worn,
the ribbon cartridge needs to be replaced.
Go to the "Carrier Drive, Home Position Sensor,
Ribbon Feed Service Check" on page
Diagnostic Information 2-11
2-17.
2-17.
2-17.