Dc12 registration fail

[regalcopy]

Hi,
xerox docucolor12 : Yellow color registration is out & sometimes all colors fails to register. I have cleaned the ibt assy in & outer side. 200 copies came very fine but later same problem started.

On card stocks the problem is more

how can i solve this problem. Any help..

[davidj7]

Have you cleaned the IBT Belt reflection patch and the sensor

[TechMate]

..Yellow color registration is out & sometimes all colors fails to register. I have cleaned the ibt assy in & outer side..

Assuming that you have cleaned the IBT assy, check and tighten the flywheel screws at the back. Align deve tanks by setting NVM 771-881=1. Run maxsetup and see if the colours align esp. yellow. If yellow is still misaligned, set NVM 720-484=4, 8 or 12 depending on how it re-aligns. Have a go!

[regalcopy]

what exactly is ibt reflection patch?
i have cleaned the ibt surface & the rollers inside the unit, 1 silver colored patch on ibt, sensors.

changing the values as mentioned is not showing good results.

any helps on rectification.

[davidj7]

How many prints have your machine done?.Have you checked the IBT clutch assembly , you can access it by removing the waste toner pipe assembly.Does a black patch comes in the centre of the print while this issue occurs?

[regalcopy]

while the registration problem is there, i observe black light brush-type patches in middle of copy (like drum cleaning blade out copies). clutch cleaning i have not done . pls help

[davidj7]

If I think is correct you have a problem with the cluch assembly located behind the IBT assebmbly, I havent touched a DC12 for couple of years i could be rusty .When you open the back cover , you can see a flywheel, remove it , you will find a waste toner pipe , remove it , You will find the clucth assembly with a belt going through it.I think there are two clucthes and one or two gears , clean or replace the clutches and see if any of the gears are broken.If you have another DC12 I suggest changing the IBT assembly and checking before you touch the clutch.

[regalcopy]

thanks for the concern. i opened the clutch assembly and cleaned the clutch which was dirty. one of the gears, i found on clutch assembly looks little out of threads. i could find only one clutch there. where is the second one?

i have run a few copies (approx. 200) now my copies are better. only very small mis-registration on only yellow color.

any suggestions..

[davidj7]

replace clutch.