Hitting one pop bumper fires both of them at the same moment. The connectors, the pop bumper boards and the CPU board had all been renewed.

Both pop bumpers fire together when one is hit: spoon switch contacts too close

Cause: The spoon switch contacts were set so close that the shake from one bumper firing closed the other bumper's switch.

Checks

• Slip a piece of paper between the spoon switch contacts of one bumper and test: if only the other fires now, the switch gap is the cause.
• Check the spring and skirt action on each bumper.

Fix

• Open up the spoon switch gap, then bring it back in a little at a time until each bumper fires reliably on its own without setting the other off.

Systems

• Gottlieb System 80

Games

• James Bond 007

Related tips

• Fuse F21 blows at game start: find the shorted pop bumper driver board
• A pop bumper doesn't work at all
• Has the pop bumper board factory fix been done?
• How the pop bumper driver board fires its coil
• A pop bumper never fires
• Add power and fire LEDs to a pop bumper driver board
• Pop bumpers fire on their own or work only sometimes
• Pop bumper fires erratically or several times

Source: Pinball Repair help group!! (Facebook group)