Target Alpha
Gottlieb, 1976You're currently viewing posts by Pinsider howardr.
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The Last Ball (BX) relay has 2 coils. When the last ball drains, one of the first things that should happen is that the Last Ball relay's A9735 coil, the one with an Orange-Black wire, should activate. Is this happening?
Can someone with a working Target Alpha verify that this is when the Last Ball relay activates?
Quoted from Radar27:i cannot upload a short video here.
Upload to youtube or similar and post a link.
Quoted from Radar27:It seems to me that it flutters a bit (pulls in, then very quickly resets and pulls in again)
BX should pull in and not reset. Then the Coin unit stepper should count down (to check for match) and then the Game Over relay (Q) should lock on.
You can use a bulb tester to check whether the Last Ball reset coil (BXR) is getting power when it shouldn't be.
https://pinside.com/pinball/forum/topic/reading-gottlieb-schematics#post-2634425
https://pinside.com/pinball/forum/topic/em-pinball-circuits-basics-to-not-so-basic/page/2#post-3184715
Quoted from HowardR:It seems to me that it flutters a bit (pulls in, then very quickly resets and pulls in again)
Your cellphone should be able to take a slow motion video in order to see what's happening.
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