Bottom-panel bridge rectifiers and fuses

Three 35 A 400 V lug bridges sit on the bottom panel: 12 V (sound board, and the source of +5 V logic), 6 V for the CPU lamps, and 24 V for the coils. Some later games such as Haunted House add a fourth for 38 V coils. Fuses on the panel cover backbox and playfield 6.3 V AC GI, 6 V DC CPU lamps, 12 V DC sound, 12 V DC logic, 24 V DC coils and the 60 V AC display supply.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• First power-up, step 1: check the bottom-panel fuses
• Quick diode test of a bottom-panel bridge rectifier
• Identifying the leads of a bottom-panel bridge rectifier
• A bottom-panel fuse blows the moment the game is switched on
• Bottom board fuses and what each feeds
• Check the bottom board and playfield fuses early
• Haunted House and Black Hole fuse panel
• Transformer panel fuses F7, F8 and F20 for 110 V and 220 V

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)