What the Q relay contacts switch
The Q relay enables playfield coil and flipper power during play and bookkeeping and also switches the backbox Game Over and Match lamps; a third normally closed contact disconnects the tilt switches during game over. The T relay has one contact for playfield GI and another for flippers, pops and slings.
Systems
Related tips
- What the Game Over (Q) and Tilt (T) relays do
- What happens when the T relay pulls in
- Hold the Q relay in to test flippers and bumpers
- None of the CPU controlled lamps light
- Pop bumper or slingshot locked on or dead
- How the Tilt and Game Over lamps are switched
- No CPU controlled lamps light
Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)