From the Gottlieb On Target technical newsletter vol. 1 issue 1, November 1980...

First Aid Emergency Repair Kit

On location repairs can be quickly accomplished if you have the proper replacement components at hand. Sometimes that's easier said than done. Well, to insure that the service technician does have the necessary replacement parts for a System 80 pinball game, an emergency repair kit is now available through your distributor. Replacement parts selected for the kit are parts that handle and control the higher current circuitry during game operation. The kit case is small measuring 12"x12-1/2"x2". Components are organized into six compartments and the attached handle makes for easy portability. Oh yes, the price is right. Ask your distributor for the "System 80 Operator Maintenance Kit".

We must be the only two! LOL!

#stopnorthpoint #justsaynotonorthpoint

Makes you wonder what kind of failures. These days, after decades of use, they've lost their capacitance and DC voltage gets bumpy... back then when relatively new, maybe they'd occasionally short out and pop?

Mine were all working except for a loose connector. Another one had some arcing between two pins that burned deeply into the board... but yet it was functional.

I'm sure somebody running an arcade, or doing maintenance at arcades, would have spare parts on hand regardless. Big Daddy wouldn't sell both the pop bumper rebuild kits and the spares kits if no demand or need.

Nobody has ever come across one of these boxes or kits?

It’s not the parts, but the box package that interests me.

Based on description in catalog, it's replacing the ball shooter that is manually pulled with an electric one activated by a button.

My guess, only a guess, is that it delayed or dampened the response coming from tilt switches. So you could bump the machine around very briefly without tilting it, but if you continuously pounded it, or dropped it, it would still tilt.

Says "prevents cheating from pounding or dropping", which seems to imply that it confines the anti-cheat to only pounding and dropping. So the plumb-bob and tilt-ball would work the same, but the under-playfield weighted leaf switch would be dampened by a delay timer. Again, just my interpretation.

Press a button and the ball is shot into play with a solenoid.

Photo here: https://pinside.com/pinball/forum/topic/gottlieb-grand-slam-plungerless#post-1874442

Yes, there's a template in that kit.

I made the assumption the player would at least be able to choose when to shoot the ball. No more 3-minute breaks between balls.

This "upgrade" would not work on games like mine where player gets to select angle of shot by stopping the chute aiming motor. Not to mention the infinite degrees of strength of shot depending on how far back you pull the plunger.