F14 is notorious for burning the diverter coils and associated components on cpu board. Seen it dozens of times. When a ball is locked and another is introduced to the shooter late and only partially plunged the diverter pulls in. If this is done several times in a row the driver trans overheats and gets hot thus pulling in the coil permanently. The 4 amp fuse only blows after the coil cooks and goes shorted.
This is a design flaw in my opinion. When I work on f 14s I now fuse the 2 diverter coils with a 2.5 amp fuse. This way the damaged is minimized if the trans fails. Using a tip 102 may help as well as they are stronger than tip122,s.jr