A playfield switch that used to work registers only intermittently in switch test and on a continuity meter.
Switch only works now and then in switch test: reflow and clean it
Cause: A cracked solder joint on the switch lug and dirty contacts.
Checks
- Before replacing the switch, check its solder joints and contacts; note which lug is common, normally open and normally closed, and keep the diode's banded end on the same wire.
Fix
- Reflow the solder on the switch lugs and clean the contacts with isopropyl alcohol.
Systems
Games
Related tips
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- What a bad switch diode does
Source: Pinball Repair help group!! (Facebook group)