System 9 reset section parts after battery corrosion

When battery leakage means rebuilding the whole System 9 reset section: 2N4401 at Q1, Q2, Q3, Q5; 2N4403 at Q4; ZR1 1N5235B or 1N5996 (6.2 V zener); 100 mfd 25 V at C2, C5, C7; .001 mfd at C1, C3, C4, C6, C8; .01 mfd at C10, C11; 22 mfd 10 V at C9; 1/2 W resistors R1 10k, R2/R3/R8/R11 1k, R4 4.7k, R5 10 ohm, R6/R10 390 ohm, R7/R9 220 ohm, R12 47 ohm, R13 56 ohm; 1N4148 at D2 and D3. D2 was a 1N5019 blocking diode; a 1N4001 or 1N4148 replaces it.

Systems

• Williams System 9

Related tips

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Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)