80/80A power supply semiconductors

Bridge diodes CR1-CR4 are 1N4004. Zeners: CR5 1N4759A (62 V 1 W), CR6 1N4746A (18 V 1 W), CR7 1N3445 (8.2 V 2 W), CR8 1N4734A (5.6 V 1 W). Transistors: Q1 SW4F013, Q2 2N5550, Q3 PMD10K40. SCR1 is an S107Y1 and IC1 a UA723CN. The 5 V adjust pot is 500 ohm.

The display supply carries 60 V DC (and 42 V DC); keep fingers off the power supply and display boards while the game is on.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• How the 80/80A power supply makes its four voltages
• 80/80A power supply test points and connector pins
• Typical voltages inside the 80/80A power supply
• Check power supply outputs with the output cables unplugged
• Power supply ripple and regulation checks
• Both halves of the power supply limit their current
• Power supply output wrong
• Power supply LEDs show voltage present, not correct

Source: System 80 Service Manual, Gottlieb