(Topic ID: 280972)

Attempting to set up add credit from coin eject - early Stern...


By pb456

75 days ago



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  • 14 posts
  • 4 Pinsiders participating
  • Latest reply 73 days ago by pb456
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#1 75 days ago

Ok, so I thought I had a good idea on an early Stern (Lectronamo) to set up a credit switch without messing up the cab or coin door.

I spotted a point on the coin door where I could mount a switch on the steel bracket to the right coin mech (left from the front of the coin door, right from behind it).

Got it mounted, verified switch action and jump wired to coin switch.

If I manually hit the new switch, it adds credit as expected.

I have verified that, when hitting coin reject (powered off, continuity test) that the switch does close.

Power on - coin reject does not trigger add credit.

I don't *see* any wiring connected to the reject mechanism. I HAVE to be missing something.

Any ideas?

(and no, there is no free play option on the Alltek MPU boards per docs)....

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#2 75 days ago

I think the metal of the arm pushing the switch closed is shorting/ground it out. Try some electrical tape on the back of the switch or that arm, and try again.

#3 75 days ago
Quoted from northvibe:

I think the metal of the arm pushing the switch closed is shorting/ground it out. Try some electrical tape on the back of the switch or that arm, and try again.

Yes, good idea - I didn't think of that. I'll try it.

#4 75 days ago
Quoted from pb456:

Yes, good idea - I didn't think of that. I'll try it.

You trying this tonight? I really like that idea and I have a galaxy right in front of me with the Altek boards too :-p

#5 75 days ago
Quoted from northvibe:

You trying this tonight? I really like that idea and I have a galaxy right in front of me with the Altek boards too :-p

Yes, I'm going to do it shortly. I think I'm going to try heat shrink tubing and cut out a small section for the contact.

#6 75 days ago
Quoted from pb456:

Yes, I'm going to do it shortly. I think I'm going to try heat shrink tubing and cut out a small section for the contact.

aaaahhahahhaha I was JUST thinking the same while staring into my coin door.... nice!

#7 75 days ago

Insulate the metal on the coin door would probably be easier. I've done this coin return trick as well and used a plastic clip to insulate.

#8 75 days ago

BOOM baby.

That was exactly it northvibe !

Thank you for spotting it!

I have a bunch of heat shrink tubing ready to use so I figured it would be more durable than electrical tape, thank you for the suggestion slochar !!!

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#9 75 days ago

The other side of that switch has a paper insulator between the contact leaf and the outer leaf. You could just rotate the switch 180 degrees and the contact leafs will be isolated, exactly like the start button is.

#10 75 days ago
Quoted from Quench:

The other side of that switch has a paper insulator between the contact leaf and the outer leaf. You could just rotate the switch 180 degrees and the contact leafs will be isolated, exactly like the start button is.

I was having a hard time with it in that position, the arm/whateveritis from the coin eject wouldn't hit it right, or maybe it was that it was possibly in the way of something else.... oh wait I know what it was - the stiffening arm was preventing that side of the switch from actuating, that and there was too much of the stack in the way that kept the switch from actuating properly.

Didn't feel like tearing the switch stack apart to trim that down.

#11 74 days ago

With you post and someone elses in the classic stern thread. I just did the switch add on this afternoon. Then put it on the middle "dollar" one and made 14/1 game/credit so it adds tons of credits with 1 press. works great!

#12 74 days ago

I should have searched for other posts on this - I didn't know it was documented!

#13 74 days ago
Quoted from pb456:

I should have searched for other posts on this - I didn't know it was documented!

It is just mentioned in threads, not ultra documented. But you're post got me thinking about doing it your way, and I found a way to make it just like yours without drilling.

https://pinside.com/pinball/forum/topic/price-check-1980-sterns-quicksilver-stargazer-seawitch/page/82#post-5948125

#14 73 days ago
Quoted from northvibe:

It is just mentioned in threads, not ultra documented. But you're post got me thinking about doing it your way, and I found a way to make it just like yours without drilling.
https://pinside.com/pinball/forum/topic/price-check-1980-sterns-quicksilver-stargazer-seawitch/page/82#post-5948125

Yes that looks like a good option too. I don't mind drilling in the coin mech bracket. I know it won't move after I mount it.

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