With help from this site
www.fixmyownprinter.com 
Its a HP Officejet G55......printer and scanner/copier all in one.
Ok its a few years old but its been excellent and was about to bin it and go buy another.....when i thought about an hour ago I'd see if it could be fixed.
Problem was with it, when you did a preview scan, it did this but when the scanner light returned to its start position.....it didnt stop and you got a grind noise as the belt was jumping over the cogs.....then it said scanner failure on the display....power cycle required.

Found the site mentioned above and after 10 mins of wading through threads.....found out how to remove the glass panel on the top.

......there was one suggestion of cleaning the white bar on the underneath side of the glass....which i did but didnt do anything for it

Then found another thread on the same prob suggesting cleaning a positioning disk on the end of the motor spindle (I assume it counts the revolutions of the motor) . Did this and it did the trick

Scanner now working again fine

So If anyone else gets printer/scanner probs, before binning it and buying another, I suggest you visit
www.fixmyownprinter.com , it could save you some dosh, to spend on your Omega
