Xerox 252 printing colors off register

Hi everyone,
I have a Xerox DC 252 that just started printing all colours off register, especially cyan and magenta are off by 0.5 mm. Any idea how to fix this.
Your help is much appreciatd.

 

This could be caused by several things.

Follow the steps and then print test pattern 1 full color to test registration.

Under "REGISTRATION"

Regi Measuring Cycle
Registration Control Sensor Check Cycle
Registration Control-Setup Cycle

If any are "NG" you have a problem somewhere.

 

I noticed that the problem seems to be with black only, it´s off register by 1 mm. All other colors line up in register. I changed a new black drum but still the same.

 

Did you preform the procedure I recommended?

 

I did all 3 procedures, have the results but nothing changed, where do i go from there? Any NVM to reset things. I am sending you the results on PM.

 

here are the results: