DC 250 Color Misregistration

[Guest]

I have a Xerox DC250 that is having color misregistration issues. None of the colors line up and when I run Regi-Con sensor check cycle and registration measurement cycle, I get all "NG". I have replaced the IBT belt with a new one and have tried swapping out the MOB sensor (or transfer belt home sensor, i've seen it called both) from a different machine (granted the one I swapped with could also be bad, I'm not sure). Can any one help me with aligning these colors. I have the PWS for this machine and will include a picture of a test print I made from CE Mode (Test Print #1). If any one can give me any insight to this issue, I would appreciate it greatly. The service manual seems to be of little help to me in this matter.

2011-08-04_10-46-42_362.jpg

[adriansto]

Re: DC 250 Color Misregistration

You must check the registration chevrons on ibt belt. Magenta is the reference color. If there is any problem with developer assy's or drum assy's then the registration chevrons are bad and the regicon procedure dont work.

[azehnali]

Re: DC 250 Color Misregistration

I thought cyan was the referance point
are you getting ng on all colors when you run I think its dc 671

[mudaero]

Re: DC 250 Color Misregistration

azehnali,
Yes, I am getting NG on all colors. It seems that any procedure that I run (i.e. dc671, dc673) will give me NG for the result. I will include pictures of the screen when I run these procedures in CE mode .

adriansto,
Also, while I am not the most savvy when it comes to printer repair, would it be possible that you could explain to me how I would go about checking registrations chevrons for this machine. If this question is pedestrian, then I apologize, but my formal training is in computer programming and not printer repair.

As for the reference color, I have also heard that it was cyan, but again I am by no means an expert on this subject.

I thank you both tremendously for your help.

Registration_Measurement_1.jpgRegistration_Measurement_2.jpgRegiCon_Sensor_Check.jpg

[azehnali]

Re: DC 250 Color Misregistration

I would start off checking the mechanicals first
make sure that drums rotate easaly ,developer housings ,ibt belt ,the cleaner housing
how many copies are on the copier
and also change the mob sensor
its the one on the left right above the ibt belt
change the whole assembly with one that you know works for sure

[mudaero]

Re: DC 250 Color Misregistration

I have swapped the drums into different spots and it produces the same results. The belt is new and I could check the developers as I have not yet done that. The machine does have a few copies on it (about 700,000). When you say change the mob is this what you are talking about (check picture)....

MOB_Sensor.JPG

[azehnali]

Re: DC 250 Color Misregistration

700,000 is not a lot
and yes that is the sensor I am talking about
also take the bypass tray out ,then the left cover and then put the bypass tray on and run the copier with that cover off and you will see on the ibt belt on the very ens of it the copier will put these pattens with is what it does for color regitration
see if it does do that
I had this problem a couple of weeks ago but mine was only yellow ,yours could be cyan and thats why every thing is of

[mudaero]

Re: DC 250 Color Misregistration

Excellent. Thank you for the information. I will try that and let you know the outcome. Many Thanks!!!

[adriansto]

Re: DC 250 Color Misregistration

The chevrons are the color marks on the ibt belt when you do registration
These marks are read by mob senzor. If the marks is not good enough then the mob senzor readit with error.
Check mylars on developer housings

[safas]

Re: DC 250 Color Misregistration

I've recently had an experience where I had a machine do this to me, when I had to take out the ROS (Laser unit) and cleaned it.

While doing so there is an arm below the laser that moves back and forth for the machine to make the adjustments.

sometimes the ends get caked up with toner so it doesn't move freely.

You might want to look at that.

[adriansto]

Re: DC 250 Color Misregistration

Yes the cyan is the refference color.
The ros window may be cover with toner.
Look at the big marks on the ibt belt when you do color registration.
This marks need to be very good on both side of the ibt belt.

[kalindd]

[johnner66]

Re: DC 250 Color Misregistration

just try to clear the nvm data all and redo regi.com again it work for me good luck

[mudaero]

Re: DC 250 Color Misregistration

Ok, I have removed the cover and checked the chevrons. I have not replaced the MOB ADC Sensor yet as I have been checking what has been listed first. As far as I can tell by watching the chevrons, the patterns are very clear. I have also printed the error report after running the Registration Measurement. I have received the following errors...

Chain-Link Counter
089-601 3
089-602 3
089-603 3
089-604 2
089-605 2
089-606 2
089-607 2
089-608 2
089-609 2
089-610 2
089-611 2
089-612 2
089-613 2
089-614 2
089-615 2
------------------ Also received this as well....
092-651 1
092-652 1

I will attempt to clean the ROS Windows as well and reset the NVM (would someone be able to explain how I would do that). If there are any other suggestions out there, I will thank you in advance for leaving them. Also, with this problem, the amount the colors are offset is consistent with every print. Every color appears in the same spot every time I print something. Not sure if that means anything but I figure it might help diagnose the problem...

Thanks Everyone, I truly appreciate the help.

[adriansto]

Re: DC 250 Color Misregistration

Check again the mob sensor, harness, voltage.
Do procedures like service manual said.