All you need to do is add a wire from the (-) end of the large filter cap to the bolt on the underside of the frame - see the photo. A simple cure for the System 1 and 80(X) regulator supply ground problems is to connect the ground plane of the regulator circuit board to one or two of the studs that the securing screws use to hold the circuit board to the regulator's heat sink, and then making sure that the heat sink frame is connected to the cabinet ground plane. Gottlieb System One pins had only a single ground pin going to the regulator supply, and this would weaken over time the same way as the System 80(X) problems are covered below. This stems from their reluctance to learn from Williams, Bally and Stern's use of the metal mounting plate as a common ground plane for the game boards. Please note that ALL Gottlieb Electronic pinballs have problems with the ground connections ( back story here). Recommended ground modification to System 1 regulator/power supply if you have to take it apart for service and want a nicer look than a wire soldered to the cap and jammed under a screw - this gives the same electrical results as the above mod.
Symptoms of missing ground connection here and on the driver board (below) are overheated driver transistors - these lead to melted coils - and that the fuse doesn't blow until damage is done. The ESSENTIAL ground modification if the game is working (or even if not), and you want to KEEP (or get it) working! System 1 - VERIFY ALL GAME FUSES ARE CORRECT BEFORE PROCEEDING!!! System 3 (1989 - 96: Lights-Camera-Action! - Barb Wire) System 80/ A/ B(1980 - 82: James Bond - Circus, ( /A 1982 - 85: Devil's Dare - Ice Fever, ( /B 1985 - 89: Big House - Bone Busters Inc.) System 1 (1977 - 80: Cleopatra - Asteroid Annie) For the theory behind all this click this link Symptoms these ground upgrades help fix: Overheating transistors, sound(s) cutting out, flash lamps melting ramps, solenoids overheating slowly, displays cutting out, pop bumpers being erratic or dead randomly, MPUs locking up at random.
Gottlieb Ground Cures by series: (updated