Quoted from TronGuy:May as well keep going:
The plunger is sitting too high, only hits the top half of the ball, it barely makes it to the playfield.
Adjusting your shooter housing isn't hard.
1. Take out your balls (manually plunging them up or in "CLR" mode in the test menu)
2. Raise your playfield.
3. Now, from the *inside* of the cabinet, remove the two #6 machine screws (1/4" nut driver) that secure the shooter housing backing plate, then loosen all three housing mounting screws (screwdriver).
4. Now, re-tighten those same housing screws incrementally until the housing can be moved with considerable effort only.
5. Lower the playfield and lay a ball in the shooter lane.
6. Move the housing up/down/left/right until the shooter tip strikes the ball dead center.
6b. Load or remove washers on the shooter rod to ensure the shooter tip sits just a few millimeters behind the ball in the resting position.
7. Remove test ball and raise the playfield again.
8. Tighten the housing mounting screws. (Note: as you have now moved the housing, the set two set screws that had secured the backing plate will no longer line up with their holes, so leave them aside. Also, the upper-right mounting screw is harder to access with a screwdriver than the rest, and it's very handy to use a wiggle bit in that case.)
9. Lower the playfield and test fire the shooter on a test ball. If the tip still isn't lined up with the ball, repeat the prior steps until it does.
Note: in some cases, the housing will be unable to move far enough in the cabinet bore to align the shooter tip with the ball. In such cases, it's necessary to either shim the housing or modify the cabinet bore slightly to allow you to shift the housing sufficiently.