Original pop bumper driver board values (A-19741)
R1 1.5k, R2 12k, R3 220 ohm (all 1/4 W); C1 and C2 0.01 uF 100 V; C3 4.7 uF 10 V (the timing capacitor); C4 47 uF 10 V. Z1 is an SN74121N, Z2 an SN7416N, Q1 a PMD10K60 and CR1-CR2 1N4148. Connector J1: pin 1 coil, pin 2 coil ground, pin 4 trigger in, pin 5 +5 V, pin 6 DC ground.
Systems
Related tips
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Source: System 80 Service Manual, Gottlieb