Intermittent or dead functions, especially around the score reels.

Wires broken off switch solder lugs (1970s EMs)

Cause: On 1970s EMs the factory often did not heat the lugs enough, so solder lets go of the switch lug.

Checks

• Tug gently on wires at switches, especially on score reels.

Fix

• Resolder any loose wire.

Systems

• Electro-mechanical

Related tips

• Bally connectors: fatigued female pins

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)