Philips VR675 tape loader mechanism stuck?

I have removed top cover and can see that the left side of the tape loader mechanism is not functioning. This is the section which should move the two pins and rollers rearwards to wrap the tape around the big shiny angled drive wheel and thus cause the tape to make contact with the play heads. Everything else appears to be working OK. Any help would be much appreciated as I still use the machine to transfer tapes to DVD.