Seven switches in row 6 of the switch matrix never register, while the last switch in that row and every other row work.
Most of switch row 6 dead, last switch works: broken row wire
Cause: The row wire (white-blue) is daisy-chained from switch to switch. It had broken between two switches in the chain, cutting off the switches beyond the break.
Checks
- Use the switch matrix table to confirm the dead switches share the white-blue row wire.
- Start at the switch closest to the backbox (the first in the chain) and follow the white-blue wire switch by switch until you find the break.
Fix
- Resolder or repair the broken row wire at the switch where the chain stops.
Systems
Games
Related tips
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Source: Pinball Repair help group!! (Facebook group)