OP

Quoted from drsfmd:

My F-14 Tomcat won't start a multiball. It's because the upper diverter doesn't activate after the second ball is locked...so the ball keeps going to the right side kickout, spitting out the ball that is already sitting in the kickout. Rinse and repeat... so I can never start the multiball.
If two balls are locked and I activate the switch in the center right kickout (in other words from the wireform that the upper diverter sends the ball to) RELEASE lights up, the 4th ball kicks out and multiball starts as it should.
With regards to the diverter, while it doesn't work to start the multiball, it works fine in the solenoid test, and the first ball launched in gameplay often (but not always) activates that diverter and it sends the ball to the center right kickout... like it's supposed to. I should also note that all of the switches in this pathway are working fine in switch tests-- the shooter lane, the switch in the middle of the wireform, the switches in each of the kickouts.
So... any ideas why it won't activate that diverter when trying to start a multiball?

OP

Quoted from drsfmd:

Every switch registers correctly in switch tests.
I did a factory reset, just in case I had toggled some setting that would cause the multiball not to start.
It's as though the game doesn't know when to activate the top diverter. Could it be a chip issue? I'm out of ideas.