At power-on the LED shows 7, and the right flipper energizes as soon as the game is switched on.

System 9: right flipper on at power-up and LED code 7

Cause: The two large rectangular black and white playfield connectors have been plugged into each other's mates. This badly damages the CPU board: game and sound ROMs, at least one PIA and several TTL chips.

Checks

• Turn the game off at once.
• Match the wire colours on both halves of each black and white connector, not only the housing colours.

Fix

• Reconnect the plugs correctly, then repair the CPU board (ROMs, PIA, TTL chips).

Systems

• Williams System 9

Games

• Space Shuttle

Related tips

• System 9: Sorcerer uses two game EPROMs, Comet and Space Shuttle one
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• System 9 and System 11 seven-segment LED codes
• "Adjust Failure" at power-on
• Which System 11 CPU boards fit which games
• Starts in the service menu at every power-up: broken battery connection
• System 9 CPU and sound test EPROMs
• System 9 versus System 11 display data

Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)