ir6800/5800 poor colour registration

[ade7624]

Hi Guys
I have a Canon ir6800 that is having a weird fault, the colours are miss registrered along the page, ie in A3 landscape there is a shft. If you do a PG10 test page, there is a small white gap at the left side but by the time you get to the right its almost 12mm !. Any ideas please, its so far had transfer assy/belt , trans cleaner, carousel inc sensors, drum/blade etc etc.
Ta Ade

[11x17]

I usually have to replace the drum/itb drive assy to correct this problem.

[Oze]

You can try washing up the drive rollers on the ITB assy itself before you go switching out motors....give it a go...if it doesn't fix it then yes...as 11x17 says...swap out the ITB drive motor.