Huntington Beach, CA
I have 1 slingshot that stays locked as soon as I start a game, but is not locked during attract mode. I'm not sure of how to go about troubleshooting this. Anyone have any suggestions?
(Topic ID: 301674)
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Quoted from uncivil_engineer:The slings are part of the special solenoid group that doesn't get power until a game starts, and the flipper relay engages. With the game powered off, make sure the blade switches on the sling are not closing inadvertently, or are otherwise grounded. Next I would check the drive transistors. The left sling is Q75, and the right one is Q77. If those are good, look next at the smaller pre-driver transistors.
I have seen also seen the small capacitors in the switch circuit fail closed (C27, and C57), and these will cause the coil to lock on.
Thanks for replying. I am doing a playfield swap for a friend of mine and he sent you this very board which you repaired (for a different issue) back in June/July this year. After I completed the playfield swap and put the repaired board back in, it was working great (for about the past month), then today, this issue popped up. I get it. Components fail on old boards. I'm gonna work on it tomorrow to test (at least) the transistors....to be continued! Again, thank you for what you do uncival_engineer!
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