System 7 CPU board test points

System 7 test points carry the same signals and readings as System 6 (TP1 +12 V, TP2 NMI, TP3 memory protect, TP4 blanking, TP5 IRQ, TP6 phase 2, TP7 CMOS supply, TP8 reset, TP9 +5 V, TP10 ground) but sit in different places: TP9 and TP10 are at the lower left by the batteries and TP4 just right of them.

Systems

• Williams System 7

Related tips

• Identifying a System 3 to 7 CPU board
• A System 7 CPU board can run any System 3 to 7 game
• Run a System 6/7 CPU board on +5 V only
• Which CPU boards can run which system firmware
• System 7 CPU ROM sockets
• System 7 CPU jumpers that are the same on every game
• Obsolete chips on System 3 to 7 CPU boards
• Add two test LEDs to a System 7 CPU board

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)