Bench check of a pop bumper driver board

Steps

• Fit the board to a known good playfield position.
• Measure +5 V DC between pins 7 and 14 of Z1.
• Briefly ground Z1 pin 3 (the trigger input).
• Z1 pin 1 should pulse low for about 40 ms, and at the same moment Z2 pin 12 should pulse high, turning on Q1 to ground the coil.
• No pulse at Z1 points to Z1 or its timing parts; a pulse at Z2 but no coil action points to Q1.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• How the System 80 pop bumper driver board works
• Common failures on the pop bumper driver board
• Mandatory pop bumper driver board update
• How the pop bumper driver board fires its coil
• Using a pop bumper driver board as a timer for motors and toys
• Original pop bumper driver board values (A-19741)
• Add power and fire LEDs to a pop bumper driver board
• Under-playfield pop bumper driver boards protect the coils

Source: System 80 Service Manual, Gottlieb