Xerox WorkCentre 7545 prints a magenta horizontal line in the top 1/3 of color prints sent from my computer. Resolution?

SOURCE: Unable to print envelopes on Xerox WorkCentre Pro 123

Some thoughts.

Envelopes won't print from bypass tray. Cause:
Extended tray is not set up properly for envelopes. Solution: Fixed! Did not fix. Enter tools "Login" 1,1,1,1,1 Touch buttons with the following names in that order: System Settings System Settings Common Settings Other Settings Scroll down to "Extended Tray" Next to "Extended Tray" it may say "Inverter" if it does go to change settings then change it to "Offset Stacking" Close out tools.

SOURCE: 2 sided printing problem

What driver did you download? The PS driver is much less capable and I am wondering if thats what you downloaded.
I am using the PCL driver and the selections are 1 sided, 2 sided long edge , 2 sided short edge.
Unless you are runnung CAD, you really should be running a PCL driver.
Maybe I am misunderstand what you are telling me also.
If you have the PCL driver and thats still a problem let me know and I will forward all I can find.

SOURCE: Xerox Phaser 6250 started printing bad

That really sounds like the imaging unit cleaner has an issue.
If you have one try the imaging unit, I really suspect that is your problem.
Black is Faded or Missing Step 1 Clean the Laser Windows and Remove Excess Toner From the Imaging Unit Step 2 Check or Replace the Imaging Unit Gear Retaining Pin Step 3 Replace the Imaging Unit (installation instructions)
See if this link works. Xerox is infameous for these not working.
http://office.support.xerox.com/SRVS/CGI-BIN/WEBCGI.cgi/,/?St=842,E=0000000000019251353,K=6024,Sxi=13,Case=obj(19377)

SOURCE: Xerox Phaser 8550 Won't Print

I was having the same problem. Turns out the IP address in the printer was incorrect. Once I changed the IP address the printer works just fine through our network again. Find your IP address off your server and follow these steps:

1. Choose Info on display menu, press okay button
2. Choose Info pages, press okay
3. Configuration pages-printer info, press okay
4. IP address should read: Correct IP Address number should be displayed on screen.

If not follow these steps to change it:

1. Find printer setup on display menu, press okay
2. Go to connection setup-press okay
3. Network setup-press okay
4. TCP/IP setup-press okay
5. Auto should show as “Off”
6. TCP/IP should show as “On”
7. DHCP/Boot should show as “Off”

If any of these are not listed on display correctly press ok, reset to either On or Off and then enter correct IP address.

Press okay button and follow steps on display menu to exit back to main menu display screen.

SOURCE: Xerox Phaser 8560 Color not correct

the problem is not with the printer but it is with the ink that might be damaged, this is located inside the printer