The top rollover lanes score, but pressing the flipper button no longer moves the lit lanes (lane change), which makes multiball hard to start.
Lane change from the flipper button does nothing: bad 1N270 diode
Cause: A failed 1N270 germanium diode on the diode board that carries the special switch inputs, including the lane change switch.
Checks
- Check the game settings do not turn lane change off.
- Find the second (lane change) switch on the flipper and confirm it is clean, gapped and closes.
- With power off, meter the 1N270 diodes on the diode board and compare them; a bad one reads open or very different from the rest.
Fix
- Replace the bad 1N270 diodes (they are hard to find, so order spares).
Systems
Games
Related tips
- System 80 switch matrix diodes
- Pop bumpers fire but don't score: bad switch diode on the diode board
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Source: Pinball Repair help group!! (Facebook group)