Lexmark C734 Service Manual page 165

Step Questions / actions
6 Clean the printhead.
Does this fix the problem?
Print quality—blank page
Step Questions / actions
1 Is all the packing material for the
photoconductor unit in question removed?
2
Replace the photoconductor unit for the color
in question.
Does this fix the problem?
3
4 Enter the Diagnostics mode (turn off the
printer, press and hold
the printer). Perform the appropriate cartridge
drive motor test for the missing color. See
"General motor tests procedures" on
page 3-9.
Did the motor run?
5 Check the high voltage contact from the
HVPS to the photoconductor charge roll.
Ensure the contact springs are properly
mounted and that the charge roll contact
spring is making good contact with the HVPS
spring that runs through the left printer frame
to view the proper mounting and for removal
procedures.
High voltage
power supply
High voltage
contact path
Are the spring(s) defective?
Problem solved.
Go to step 2.
Problem solved.
Go to step 5.
and . and turn on
Replace the transfer
contact assembly.
Yes
Replace the printhead. See
"Printhead removal,
installation, and
adjustment" on
page 4-121.
Yes
Remove the packing
material.
Go to step 3.
Replace the EP drive
assembly. See
"Electrophotographic
(EP) drive assembly
removal" on page
Go to step 6.
Diagnostic information
5026
No
No
4-69.
2-131