DIP switch settings that make troubleshooting easier

Set 1-8 off (1 coin 1 credit) and turn on 9 (3 balls), 10 (match), 11 (replay not extra ball), 12 (tilt loses ball only), 13 (show credits), 14 (tune at game start), 17 and 18 (15 credit max), 20 (chimes on scoring), 21 (show high score), 22 (3 credits for beating high score) and 23 (tune on coin).

Systems

• Gottlieb System 1

Related tips

• Spare chips for System 1 boards
• The six Rockwell "spider" chips on the CPU board
• Which spider chips fail and why
• Swapped U4 or U5 spider still does not work
• Check the TC3 jumper plug on the CPU board
• Odd high scores usually mean a bad 5101 RAM
• Aftermarket System 1 CPU boards
• Using an LED to see a bench CPU boot

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)