The game slam-tilts at random during play even though nobody is touching the slam tilt switches.
Random slam tilts: replace the SRC6 resistor pack on the CPU board
Cause: A failing resistor pack at SRC6 on the CPU board, in the switch input circuitry, makes the slam tilt input read as closed.
Checks
- Check the slam tilt switches in the coin door and cabinet are open and not shorted to anything.
- Inspect the CPU board around SRC6 for corrosion or a cracked pack, and compare its readings with a nearby identical pack.
Fix
- Replace the SRC6 resistor pack with one of the same value and pin layout (note the pin 1 orientation), using a socket if you like.
Systems
Games
Related tips
- Random switch closures, random tilts or slam from bad resistor networks
- Spinner works in switch test but scores nothing in play: factory reset
- Switch matrix resistor networks and their values
- Replacing SRC6 with a plain bussed resistor network
- Decide whether a phantom switch is in the playfield or the CPU board
- Bussed versus isolated resistor networks on the CPU board
- Row or column error: CPU board or playfield?
- Fixing a dead switch column on the CPU board
Source: Pinball Repair help group!! (Facebook group)