Replacing SRC6 with a plain bussed resistor network
Steps
- Get a 1k x 9 bussed network (10 pins); the original SRC packs are effectively unobtainable.
- Cut off pin 10, the leg furthest from the dot (common) end; the board pad at pin 10 is ground for the capacitors you are not using.
- Fit the network with its common pin in board pin 1 (+5 V), leaving board pin 10 empty.
- Confirm the optional 0.01 uF capacitors C49-C56 are fitted; they take over the capacitor role and are usually factory installed.
Systems
Related tips
- Bussed versus isolated resistor networks on the CPU board
- Testing a resistor network with a meter
- Switch matrix resistor networks and their values
- Getting speech from a board with a 55536 speech chip
- Random slam tilts: replace the SRC6 resistor pack on the CPU board
- Random switch closures, random tilts or slam from bad resistor networks
- Lane change and shooter lane switches don't register: failed column driver Q42
- Every switch shows active, even with the switch plugs removed: failed PIA at U38
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell