Lexmark C78x User Manual

2-4 Service Manual
5061
Symptom table—500-sheet drawer option
Printer prints black only, no colors Make sure that the printer is not set up to print black
only. If the printer is set up correctly, check the Black
Retract (BOR) Motor and gears for correct operation.
If the gears are operating correctly, replace the
Retract Motor Assembly. See “BOR drive assembly
removal” on page 4-34. If this does not correct the
problem, go to “Black only retract (BOR) service
check” on page 2-80.
Print quality: 100% single color printed
• All black print
• All cyan print
• All magenta print
• All yellow print
Go to “Entire page is mostly one color—Full bleed
planes in one color” on page 2-96.
Print quality: Blank page (no image) Go to “Blank page (no image)” on page 2-95.
Print quality: Evenly spaced horizontal marks or lines
on the printed page
Go to “Vertical lines or streaks” on page 2-100.
Print quality: Black line Black horizontal lines are most likely caused by a
shorted charge roll in the print cartridge. Replace the
black print cartridge.
Print quality: Magenta, cyan, or yellow lines. “Vertical lines or streaks” on page 2-100 or
“Horizontal lines or streaks” on page 2-100.
Print quality: Colored lines, streaks, or smudges Go to “Vertical lines or streaks” on page 2-100 or
“Horizontal lines or streaks” on page 2-100.
Print quality: Light lines or streaks appear on the
printed page
Go to “Light lines or streaks appear on the page”
on page 2-105.
Print quality: Light print Go to “Light print over the entire page” on
page 2-98.
Print quality: Faded or light print and/or 34 Incorrect
Media error.
Check the Paper Type setting. If Transparency is set
when the print media should be paper or card stock,
image development may stop. Do the following:
1. Turn the printer off and leave it off for 30 seconds.
2. Turn the printer on.
3. On the operator panel, press Menu ().
4. Select Paper Menu, and press Select ().
5. Select Paper Type, and press Select ().
6. Select the tray you need to change, select the
proper setting, and press Select ( ).
To verify that the problem is solved, print a test page.
Print quality: Missing colors Go to “Missing colors—Complete or partially
missing color planes” on page 2-97.
Print quality: Uneven printing Go to “Uneven printing” on page 2-103.
Print quality: Poor color alignment Go to “Poor color alignment” on page 2-101.
Print quality: Toner on the back of the page Go to “Toner is on the back of the printed page” on
page 2-105.
Print quality: Toner smears or rubs off the page Go to “Toner smears or rubs off the page with no
error code displayed” on page 2-104.
Print quality: Multiple horizontal lines Go to “Vertical lines or streaks” on page 2-100
Symptom Action
Printer fails to recognize the option is installed Go to “The base printer does not recognize that
tray x is installed.” on page 2-73.
Symptom Action

Lexmark C78x Specifications

General

Brand	Lexmark
Model	C78x
Category	Printer
Language	English