Ground mod step 7: sound/speech power supply ground

Steps

• On games with a separate sound/speech power supply board, find the wide trace running round the edge of its solder side.
• Scrape the mask, solder on about 18" of wire, and take it to the power supply frame.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• Sound/speech power supply MA-149 parts
• Replace C33 on the speech and sound board
• Sound/speech board supplies on P1
• Sound/speech board (A6) main chips
• Sound/speech board adjustments and test button
• Sound/speech board PROM and clock jumpers
• Sound supply fuse F8 blows after the game runs a while
• Ground mod step 2: repin the power supply to CPU power cable

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