Three switches in the same switch matrix row never register, though each tests good with a meter and the other switches in that row work.
Several switches in one row never register: broken row wire at another switch
Cause: The row wire is daisy-chained from switch to switch. It was broken at a different switch further along the chain, cutting off the ones after it.
Checks
- With power off, check continuity of the row wire colour from the CPU connector to each switch; the physical order often differs from the schematic.
- Look at every switch on that wire, not just the dead ones.
Fix
- Resolder or splice the broken row wire.
Systems
Games
Related tips
- Most of switch row 6 dead, last switch works: broken row wire
- Several switches in one row or column dead: a broken daisy-chain wire
- Spinner stops registering: broken wire on an upper flipper EOS switch
- One switch does not work
- Switch matrix wire colors (all WPC games)
- Whole switch column dead after a diode went in backwards: column driver chip
- Several unrelated switches stop at once: one broken wire under the jet bumpers
- Trough ball 3 opto never registers and extra balls launch: broken switch wire upstream
Source: Pinball Repair help group!! (Facebook group)