If your diverter isn't opening when the ramp shot is lit for lock, it could be one of several things...

Diverter is gummed up. Very common. Both STTNG I owned had this issue. Both were NASTY and needed to be cleaned and rebuilt with the typical expendable stuff (coil sleeves etc) to function properly.

Ramp entrance switch is intermittent or not working. If the game doesn't see that first switch, it doesn't open the diverter, IIRC.

FYI...optical switches are "normally closed." Borg Entry (swithch 48) is an opto. In switch test, stick you finger in the side of the ship. It should then show as "open" because you've cut the beam. I don't remember where "Borg Lock" is, unless it's the one under the shell where the locked ball sits to the right side of the entry. You might have to take the shell off to explore that one.

There's a crapton of optos on STTNG, and failure of one or two of them can cause a whole bunch of fun issues, and the borg lock itself for the ship only opens in specific uses, like during multiball, or after you've lit a lock but NOT collected the lock via the right orbit. I'm pretty sure once you take a right orbit lock, the borg lock is no longer available at all until that multiball is played, but it's been a while so I may not be 100% accurate on that. If all your optos work, play around with it, the rules are odd.

These are correct. You'd think they'd have designed it to only fire for the LEAST needed function, not the most, but B/W weren't half as brilliant as people remember sometimes..

I was lucky..I had two STTNG and zero drop target/tieback issues LOL.

That said.. if you're shooting the right orbit to light the first or second lock, and the ball bounces back into the upper hole, or you biff the shot to the ramp, you'll never see the ball divert to the borg ship. AFAIK, you can ONLY lock in the ship on lock one or two (might be just the first one!?), and you always HAVE to shoot the right orbit into the subway for the third lock, and I *think* if the ball doesn't make it up into the ship, then the lock gets awarded anyways at the first switch on the ramp, which...turns off the lock.

Might be dumb but I'd also check the lamp for that insert for the left ramp.

Annoying that anyone with the game on Pinball Arcade hasn't just fired it up to verify...I'd do it but it's on my PS3, not my PS4, and I ain't paying for that garbage twice.