SMIG relay boards on Laser War and Secret Service

These games ground their 50 V coils through small relay boards (SMIG) under the playfield. A CPU TIP122 energises the 32 V relay, which closes the 50 V coil's ground. A backbox 50 V power board, the same as the System 11 flipper power board of the pre-Big Guns era, supplies the voltage.

Systems

• Data East CPU Version 1/2

Games

• Laser War
• Secret Service

Related tips

• Laser War and Secret Service use a different backbox layout
• Laser War can have a version 1 or version 2 CPU
• Flipper circuit on Laser War to Time Machine
• Fusing the special coils on Laser War to Playboy
• Laser War: CPU and display EPROM types and latest versions
• Secret Service: CPU and display EPROM types and latest versions

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