During multiball, when both slingshot switches close at about the same time, the game slam-tilts. Each sling switch tests fine on its own in switch edge test and the diodes test good.
Slam tilt when both slingshots fire together: sling switch wired wrong
Cause: One slingshot's three-lug switch had been rewired with the wires on the wrong lugs, so closing both slings at once shorted through the matrix.
Checks
- Compare each sling switch's wiring with a standup target switch that works: strobe wire and the plain end of the diode on one lug, return wire on another, and the diode's banded end on the third.
- Check any jumper wires daisy-chained to the next switch.
Fix
- Rewire the sling switch to match the correct pattern.
Systems
Games
Related tips
- Ball auto-launches as soon as it reaches the shooter lane: launch button miswired
- A dedicated (direct) switch does not work
- One switch also triggers another: corroded switch connector on the CPU board
- Random coil firing or slam tilt from weak 12 V (notably Theatre of Magic)
- A row wire on the wrong end of a switch diode creates ghost switches
- Phantom switch closures: one switch triggers something unrelated
- Using the switch edge test
- Check playfield switches with the switch edges test
Source: Pinball Repair help group!! (Facebook group)