Black And White Only-Cyan, Magenta, And Yellow Are Missing; Light Print Over The Entire Page - Lexmark C78x Service Manual

5061
Step Actions and questions
7 Cartridge contact assembly—Check the cartridge
contact block. Make sure the PC drum contact pin is
not stuck. See
locations (cyan, magenta and yellow)" on page 5-4
to identify the PC drum contact pin.
Does the pin operate correctly?
8 Perform a continuity check on the developer HVPS
cable.
Does the cable check out?
Black and white only—cyan, magenta, and yellow are missing
Step Actions and questions
1 Check the Print Mode setting in the Color Menu.
Is the Print Mode set to Black & White?
2 Ask the user or network administrator to check if the
correct color driver is installed.
Is the correct color driver installed?

Light print over the entire page

•
If all colors have light print, go to
•
If only one color has light print, go to
2-98
Service Manual
"Cartridge contact assembly pin
"All colors have light print over the entire page" on page
"One color has light print over the entire page" on page
Yes No
Go to step 8 Replace the
cartridge contact
assembly. See
"Cartridge
contact
assembly
removal" on
page
Replace in order: Replace the
developer HVPS
1. Developer
cable.
HVPS board.
See
"Developer
HVPS board
removal" on
page 4-39.
2. System
board. See
"System
board
removal" on
page 4-90.
Yes No
Change the Go to step 2
setting to Color.
Install the correct Go to
color driver. only retract
(BOR) service
check" on
page
4-35.
"Black
2-80.
2-99.
2-99.