Uneven Printing - Lexmark 13P0150 - C 750dtn Color Laser Printer Service Manual

Step Action and Questions
2
HV Contact Block Assembly Check, Doctor Blade or TAR
Contact - Check for a stuck TAR contact pin in the HV
Contact Block Assembly of the colors with the problem.
Look at figure 1 for pin locations.
Is the TAR contact pin stuck or operating smoothly for the
colors with the problem?
3
Doctor Blade Contact - Check to make sure the Doctor
Blade Cable is connected to the Doctor Blade terminal on
the Developer HVPS.
Is the cable connected correctly?
4
Doctor Blade Contact Pin in HV Contact Block Assembly
Check to make sure the Doctor Blade Contact Pin in the HV
Contact Block assembly is not stuck and is operating
smoothly. Look at figure 1 for pin location.
Is the Doctor Blade contact pin stuck operating smoothly?
5
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?
6
Cartridge HV contact Assembly Developer Pin Springs
Check the developer pin springs for the cartridge that is
having a problem to make sure they are no bent or
damaged.
Are the springs bent or damaged?

Uneven printing

If all colors have uneven print, replace the ITU assembly.
Note: The uneven print may appear as spots or streaks that are different on each page.
The most likely cause for this type of problem is damage to the ITU belt in the ITU
assembly. Replace the
If only one color is missing or printing uneven, go to step 1.
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?
5060-XXX
"ITU Assembly" on page
Yes No
Go to Step 3 Repair the HV
Block Contact
for the faulty
color
Go to Step 4 Connect the
cable
correctly.
Replace the
cable if it is
broken or
damaged.
Go to Step 5 Repair the HV
Block Contact
for the faulty
color.
Go to Step 6 Repair the
High Voltage
Contact
Assembly as
necessary
Replace the Replace the
damaged "HVPS
Developer Developer
Spring Board" on
page 4-36
4-40.
Yes No
Problem Go to Step 2
Solved
Diagnostic Information
2-75