Test PROM switch actions

Switch 00 (test button) lights lamp 1 (Game Over), pulls in the Game Over relay and enters audits; 01 and 02 are the coin chutes and 03 the credit button (start the test, add a player); 04 (tilt) lights lamp 2, pulls in the tilt relay and can end the test. Switches 10, 20, 30 ... 70 fire coils 2 to 8 in turn (10 the knocker, 20/30/40 the 10/100/1000-point coils) and toggle the Game Over relay/lamp (10) or lamps Q3 to Q8 (Q3 high score, Q4 shoot again). Switches 11-14 toggle L9, L16, L23, L30; 21-24 L10, L17, L24, L31; 31-34 L11, L18, L25, L32; 41-44 L12, L19, L26, L33; 51-54 L13, L20, L27, L34; 61-64 L14, L21, L28, L35; 71-74 L15, L22, L29, L36. While L9 to L14 are lit, switches 11, 21, 31, 41, 51 and 61 also count up the score display in 1s, 10s, 100s, 1,000s, 10,000s and 100,000s, a handy check of each digit.

Systems

• Gottlieb System 1

Related tips

• Testing switch return buffers Z9 and Z28
• System 1 switch matrix layout
• Logic-probing the switch matrix
• Switch strobes missing at Z8
• Slam and outhole switches sit outside the matrix
• CPU plug A1J7 (playfield switches) pins
• Switch matrix dead after coil or GI voltage touched it
• CPU plug A1J6 (coin door) pins

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)