After the playfield was swapped, none of the five flippers work, although the game otherwise runs and the fuses are good.

All five flippers dead after a playfield swap: cold joint on the tilt relay

Cause: The flipper power runs through the tilt relay, and a cold solder joint on that relay broke the circuit.

Checks

• Make sure the game is not tilted, and watch whether the tilt relay pulls in when a game starts.
• Inspect the solder joints on the tilt relay and the wires and connector feeding the flippers.

Fix

• Resolder the cracked joint on the tilt relay.

Systems

• Gottlieb System 80

Games

• Black Hole

Related tips

• Flippers dead during play: check the "U" relay
• Black Hole playfield fuses
• Flippers dead after a rebuild: EOS switch not closed at rest

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