Refer to pg 2-21 of the manual and the B-9361-R-6 Ball Eject Assembly:
http://www.ipdb.org/files/2524/Williams_1991_Terminator_2_Judgment_Day_Manual.pdf
See attachment.
Is your Eject Cam (2) really sticking up or is it that your switch is not high enough? Like beerorkid, I think it is a switch problem because you say the faulty saucer still does hold the ball. A relaxed eject cam tip (2) should not prevent the ball from resting nicely in the bottom of the red cup so as to depress the switch about 1/4 inch.
Is your eject cam tip (2) higher than that?
NO?:
I'd go into T.3 Single Switch test (pg 1-25) and using a ball in the saucer, test that the switch closes. Adjust the switch at the microswitch housing (the clicking box) until the ball can trigger a closure. See the section on microswitch adjustments here:
http://www.flippers.be/basics/101-switch_adjustment.html
YES?:
Then you are saying the Eject Cam (2) is sitting too high, preventing the ball from closing the switch underneath. Can you push down on the ball to make the eject cam go down?
If the eject mechanism is simply not returning to its fully relaxed position, I'd disassemble the assembly and inspect/move everything by hand, looking for where it is binding.
- Metal plate (1) or cam (2) bent?
- Missing/broken coil spring (3)?
- Coil plunger (3) tip mushroomed?
- Clean the plunger (3)
- Clean/replace the coil's nylon plunger sleeve.
- I'd mention a missing/broken plate spring (5), but looks like that actually biases the eject cam upward.