Logic chips worth stocking

74HC273 drives the coil MosFETs; 7406 drives the 12P06 strobe MosFETs, fed by 74HC164 for the lamps. The CPU board uses a 74HC123AN at U11, a 6264 (or older 6116) RAM at U3, a DS1210 battery controller, LM339 comparators, 65C22/6522 interface chips and a 65C02 processor.

Systems

• Gottlieb System 3

Related tips

• Game resets every two seconds
• Replace a failed 6116 RAM with a 6264
• Game stuck showing the last four high scores
• CPU board will not boot, or keeps rebooting
• What the A3 driver board drives
• Battery error stays after a new battery
• Gottlieb System 3 CPU passes test ROM, then watchdog trips: torn trace and wrong parts
• Switch matrix connector pins and their chips

Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)