As soon as a game starts, balls keep popping into the shooter lane and auto-launching.

Star Wars: game goes straight into multiball at start

Cause: Cracked solder joints on the flasher/solenoid select relay K1 ("L/R") on the PPB board. Unpowered, the relay routes to the solenoid side, so when the game tries to light a flasher it fires the paired ball popper instead.

Checks

• Inspect the joints of relay K1 on the PPB board.

Fix

• Reflow all the relay's solder joints.

Systems

• Data East CPU Version 3

Games

• Star Wars

Related tips

• Star Wars Death Star motor specification
• Star Wars: CPU and display EPROM types and latest versions
• Balls keep launching as soon as a game starts

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)