Spare diodes, capacitors and resistors for System 3-7
Keep 1N4004 (coil) and 1N4148/1N914 (general) diodes, 1N4763 91 V and 1N4730 3.9 V zeners for the display supply, 6A4 diodes for the System 3-6 logic supply and 35 A lug bridge rectifiers. Capacitors: a 12,000 mfd (System 3-6) or 18,000 mfd (System 7) axial for the +5 V filter and 100 mfd 150 V axials for the display supply. Resistors: 1.2K 1/2 W and 39K 1 W flameproof for the power supply, and 27 ohm 5 W wirewounds for the driver board feature lamps.
Systems
Related tips
- Power circuits in a System 3-7 game
- Replace the +5/+12 V logic filter capacitor
- Upgrade logic rectifier diodes D7 and D8
- No +5 V on a System 3-6 power supply
- No +5 V on a System 7 power supply
- Early Black Knights use the System 6 power supply
- High-voltage supply rebuild parts, System 3 to 11C
- Leave the big lamp filter capacitor unless it is leaking
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)