My new TS 55 / TS 75 will not plunge to the full depth. Why?

Prior to your first cut using your new saw and guide-rail together, the splinter guard on the guide rail must first be trimmed to allow free movemnt of the saw blade as it plunges down in the cut. To do this, you should trim the splinter guard along its full length. Place the saw on the guide rail, turn the saw on and slowly plunge the saw down and run it along the fill length of the rail to finely trim the edge of the splinter guard.  This will ensure a zero tolerance cleance against the blade and the guard.

For a visual guide on trimming the splinter guard, see the video below.