If, by SOFT images you are referring to a scan that has the look of the soft-focus lenses they use for aging actresses, and the darks are over-run with a glow from the the lights, it's probably as simple as a dirty reflecting mirror.
If when facing the front of the machine there is a lens/scanner pointing directly at you, inside the machine, below the Magazine insertion hole.
Between you and that lens is a little 45° mirror that bounces the film's image to the lens.
That mirror, which faces away form you in a vertical orientation, will 'fog' over time from smoke and grime -- microscopic particles of dust -- settling on the mirror surface. It makes the light beams scatter, making pictures look like this:
<img src="http://www.darrowart.com/other/forums/sample_foggy.jpg">
But with the instructions (for a similar model)
found here, you can easily clean the mirror (I used windex and a cotton ball after removing the mirror.
Now I get scans that look like this:
<img src="http://www.darrowart.com/other/forums/truck-sample.jpg">