Lotem 800v2 Image shifting

Hi

We are facing data shifted vertically on the plates; checked the ripped lqs tiff file ok, after expose and develop we have seen text/image got shifted/jumbed slightly in vertical manner.. (not all over the plates, shifted/jumbed here and there)

We are using Prinergy + Xpo + Universal Tsp + cable (lotem 800v2)


How to identify which one causes problem ..

1. TSP card / cable
2. Laser diode / LDD card
3. Strobe
4. DDb board

regards
kala