You likely have a loose (or corroded pins on the) Jones Plug connector either on the bottom insert board or in the back box.

Check the AS unit and alternating relay. Check the switch on the drop target bank that is supposed to close when all the targets are down. If none of this works, I'll be down Thursday to relieve you of the game.

It's a Gottlieb, not a Bally!

On Sky Jump, the Target Bank reset coils are activated by normally closed switches on B, C, then a make/break switch closing on E, then a switch closing at score motor position 2C. I would think Free Fall is the same.

B and C are the 50 and 500 pt. relays, and E is the 5000 pt and Reset Target bank relay.

Since the game is also having a problem with the 50/500 point scoring relays, is one of them getting stuck on? If so, then that would keep the switch open and prevent the targets from resetting during game play.

yup... give electricity a path, and it will follow...

The drop target switches are those "make/make" style (i.e. they push two switches together). Maybe check to make sure none are touching closed when they ought not be. I can kinda see a path that would activate C when B is able to make.

It's hopeless. I'll see you Thursday. Just think how happy the wife will be seeing one go out the door instead of in!
No, seriously; if you can't get it, I'll take a look at it Thursday. I work for beer.

If you manually press in the switch ladder stack on the 50pt relay, then does the 500pt relay also engage with it?

If you manually press in the 500pt, then does the 50pt engage? (Or is it just the one combo?)

Interesting.

I'm looking at a Sky Jump schematic, so it's possibly different than Free Fall, but I see only two paths to C (500pt relay).

The main one to activate it goes through the scoring path: yellow target, 1 through 7 drop target switches, 1 through 7 rollover relay switches.

The other path is the lock-in path through a switch on C itself.

Since manually activating B alone also activates C, that seems to eliminate the scoring path.

So I'd check the lock-in switch on C itself next (including the back tabs).

May as well check all the scoring paths switches too then.

Otherwise, could start blocking switches until C stops activating, to isolate.

Here's the snippet from Sky Jump.

SJsnippet.jpg

I'd start by blocking the switch at score motor position 2B. Neither relay should lock on then. You may also want to remove the service plug on the score motor so it doesn't run all the time.

Triple check all the make/break switches on the 1 through 7 rollover relays also. If any of those end up closed/closed, then a path to activate C is made whenever B activates and the B lock-in switch closes. (This is testable by blocking the lock-in switch on B.)

Thirsty Thursday.....

Beer.gif

Yay!

Wait, there's more? Looking...

Is 'D' activating?

That's the 10x value relay. It's activated via a normally closed switch at score motor position 1C, and the Multiplier Control unit wiper. I'd start with the score motor switch, but also make sure the copper braided wire is on the Multiplier unit wiper.

OK, good. Is it staying locked on while the score motor runs?

The D and C relays both need to be active to close make/break switches on each of them, which activate the L relay five times (via pulsing a switch at score motor position 1A).

So could be either of the make/break switches on C or D (not closing, or are dirty). Or, one of them isn't staying locked on.

Should be a stepper unit. I don't recall offhand if it's under the playfield or on the score motor board. Don't think it's in the backbox.

Pics?

Could be the jones plug from the playfield to the backbox too.

Presumably L isn't activating at all then, right?

There's just the 1A, C, and D switches, plus the jones plug in the path:
5000pt.jpg

Probably is a mini-stepper, not a big one like the ball count.

I'd also double check the C and D make/break switches. Visual inspection alone can be deceiving on those small switch stacks. Flexstone, gap check, meter.

Picture?

Excellent, congrats! Those switch stacks can fool the eye. Good strong light helps sometimes.

Does the A/S relay look like the one shown here:
https://pinside.com/pinball/forum/topic/centigrade-37-help-having-some-trouble-1#post-644581

If so, that's a mini-stepper.

What's your A/S relay look like then?

There has to be a way to move the light for the 1-7 targets.

Can you post some pictures of the underside playfield and bottom cab board?

Oh, so they move as a set of four? Sky Jump has one lit at a time.

Sorry, Already answered......