What the adapter LEDs show

The adapter has two LEDs: 5 V, which should light the instant the game is switched on, and Reset, which should follow about a second later. They only show on/off, not exact voltage. The adapter does not cure other board faults.

Systems

• Williams System 6 / 6A

Related tips

• "Adjust Failure" at power-on
• Game powers up in audit mode instead of attract mode
• Intermittent lockups with both CPU LEDs on
• Game only boots after several power cycles: corrosion under the 6808 CPU socket
• Game keeps resetting: replace the 5101 RAM (an NVRAM works)
• Random lockups from the 12 V logic pin
• CPU never starts: check the reset line at IC1 pin 40
• Usual causes of lock-ups and resets

Source: Williams pinball EPROM adapter instructions, Siegecraft