Symptom Tables; Symptom Table-Base Printer - Lexmark C750 Service Manual

Symptom tables

Symptom table—base printer
Symptom
Fuser fan fails to run or is noisy
RIP fan fails to run or is noisy
VTB fan fails to run or is noisy
Machine inoperative: Fans don't turn, engine not on,
lights not on, none of the printer functions work.
Operator panel: One or more buttons do not work
Operator panel: Display is blank, printer does not
sound 5 beeps, but printer is not inoperative.
Operator panel: Operator panel displays all diamonds
continuously, sounds 5 beeps and POST inoperative
Operator panel: One pel or random pels are missing
Paper feed problems, base printer
Paper feed problems, integrated tray
Paper feed problems, MPF
Printer prints black only, no colors
Print quality: 100% single color printed
• All black print
• All cyan print
• All magenta print
• All yellow print
Print quality: blank page (no image)
Print quality: evenly spaced horizontal marks or lines
on the printed page
Print quality: black line
Print quality: magenta, cyan, or yellow lines
Print quality: colored lines, streaks, or smudges
Print quality: light lines or streaks appear on the
printed page
Print quality: light print
Print quality: missing colors
Print quality: uneven printing
Print quality: poor color alignment
Action
Go to "925 Error code" on page
Go to "927 Error code" on page
Go to "926 Error code" on page
Go to "AC and DC power service check" on
page 2-112.
Go to "Operator panel LCD/status LED/buttons
service check" on page 2-132.
Replace the operator panel. Go to
removal" on page 4-46.
Go to "Operator panel LCD/status LED/buttons
service check" on page 2-132.
Replace the operator panel. Go to
removal" on page 4-46.
Go to "200 Paper jam—Tray 1" on page
Go to "Tray 1 service check" on page
Go to "Multipurpose feeder (MPF)" on page
Make sure that the printer is not set up to print black
only. If the printer is set up correctly, check the black
retract motor and gears for correct operation. If the
gears are operating correctly, go to
retract (BOR) service check" on page
Go to "Entire page is mostly one color—Full bleed
planes in one color" on page
Go to "Blank page (no image)" on page
Go to "Horizontal lines or streaks" on page
Black horizontal lines are most likely caused by a
shorted charge roll in the print cartridge. Replace the
black print cartridge.
Go to "Vertical lines or streaks" on page 2-138
"Horizontal lines or streaks" on page
Go to "Vertical lines or streaks" on page 2-138
"Horizontal lines or streaks" on page
Go to "All colors have light print over the entire
page" on page 2-142. or "One color has light print
over the entire page" on page 2-143
Go to "Light print over the entire page" on
page 2-142.
Go to "Missing colors—Complete or partially
missing color planes" on page
Go to "Uneven printing" on page
Go to "Poor color alignment" on page
Diagnostic information
5060-00x
2-90.
2-91.
2-90.
"Operator panel
"Operator panel
2-67.
2-149.
2-70.
"Black only
2-117.
2-140.
2-139.
2-137.
or
2-137.
or
2-137.
2-141.
2-145.
2-144.
2-3