Flippers are dead; the driver board flipper relay does not click on when entering any test after the display test.

Flipper relay does not click on in test

Cause: The relay drive: transistor Q13 (2N4401, fails most), the 7402s at IC8 and IC9, the 7408 at IC7, or the 6821 PIA at IC5; or the relay itself.

Checks

• Diode-test Q13 first.
• Test the gate chips and PIA.

Fix

• Replace the failed part; a 6 V relay (MagneCraft W78CSX-1) replaces the relay.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Flippers dead, or still live after game over: the flipper relay
• No flippers at all: flipper relay K1 not pulling in
• Test a 2N4401 pre-driver with a meter
• Solenoid driver test at 2J9 and 2J11 with Leon's code
• One or a few coils lock on at power-up
• Diode-test the TIP120/TIP102 and 2N4401
• CPU flipper enable relay RY1
• Flippers never work: flipper relay RY1 not pulling in

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)