Missing Colors - Lexmark 13P0150 - C 750dtn Color Laser Printer Service Manual

The entire page is mostly all one color. Some printing may appear in
other colors. This applies to Black, Cyan, Magenta and Yellow.
Step Action and Questions
1
Print Cartridge Check - Generally this problem is caused by
a bad charge roll contact in the cartridge.Try a new print
cartridge for the color that is covering most of the page.
Does the new print cartridge fix the problem?
2
High Voltage Contact Block Assembly - Check the Cartridge
HV Contact Block contact of the cartridge that is having a
problem. Check to make sure the contact pin is not stuck.
Refer to Figure 1 for the correct location of the charge roll
pin in the contact block.
Does the pin operate correctly?
3
Continuity Check - High Voltage Contact Assembly - Check
continuity from the Developer HVPS contact Spring to the
Charge Roll Pin in the contact assembly.
Is there continuity?
4
Cartridge HV contact Assembly Developer Pin Springs
Check the developer pin springs in the cartridge that is
having a problem to make sure they are not bent or
damaged.
Are the springs damaged or bent?

Missing Colors

If only one color is missing, go to
If Cyan, Magenta or Yellow is missing, go to
Step A
Step Action and Questions
1
Print Cartridge - Check to make sure the cartridge is seated
properly and that all packing material has been removed
from the cartridge.
Has all packing material been removed and the cartridge is
seated correctly?
2
Print Cartridge - The cartridge may be out of toner or have
another toner problem. Install a new toner cartridge.
Does a new toner cartridge fix the problem?
2-68
Service Manual
5060-XXX
Yes
Problem
Solved
Go to Step 3
Go to Step 4
Replace the
damaged
developer
Spring.
"Step A" on page 2-68.
"Step B" on page
Yes
Problem
Solved
Problem
Solved
No
Go to Step 2
Remove and
repair the
High Voltage
Contact
Assembly
Remove and
repair the
High Voltage
Contact
Assembly
Replace the
"HVPS
Developer
Board" on
page 4-36
2-69.
No
Go to Step 2
Go to Step 3