(Topic ID: 202700)

Lady Luck, 1968 Williams. 500 ohm resistor on Change Relay question

By Alan_L

4 years ago


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  • 11 posts
  • 5 Pinsiders participating
  • Latest reply 4 years ago by Alan_L
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#1 4 years ago

There is a ceramic 500 ohm resistor on the lugs of the Change Relay coil. Sometimes that relay locks on. Is that resistor there to keep the coil from burning?

Also, the 1 card point score reel for the first player buzzes like crazy when rotating from one number to the next. The coil stop is worn to a concave condition but it is integral with the u-shaped bracket that holds the switch stack. Does anyone still sell the whole bracket with a new coil stop? Or should I just try to file it level? File the plunger level and bevel the edges too?

#5 4 years ago

Thanks for the replies, guys.

It does sound like that 500 ohm resistor is supposed to act like a diode on a solid state game, keeping voltage from kicking back into the No. Match Unit.
But sometimes the No. Match Unit locks up and I have to power down to release it. Should I cut a leg off the resistor and test it? None of the 1 point switches work which is probably part of the problem. I have put paper strips between all the 1 point switch contacts to try and isolate the problem. Still can't find something that is making constant contact. Will keep checking tomorrow.

The coils on both the Lock and Change Relays are Z28-1150. The 1 point card drum only buzzes when advancing when I am playing, not at start up or resetting. File the coil stop? Is the coil stop itself replaceable?

#8 4 years ago

I have been searching all 1 point switches, including the slingshots, for the last two days. I have checked each switch for touching wires that shouldn't, leafs making contact and anything else that looks off. When you close a 1 point switch, it locks the 1 Point Relay which in turn locks the coil on the No. Match Unit. You can manually push the plastic actuator on the 1 point relay to release it and the No. Match Unit will release. But the 1 point relay should just pulse and not lock on, right?

Here's something: When I first started repairing the game, I removed the No. Match Unit disc in order to sand and clean the many contacts underneath. I marked the disc's position on the contact plate with a sharpie so I could reinstall it in the same position, and then when I wiped the contact disc with alcohol to clean off any sanding dust, I wiped off the sharpie mark. Pure genius.

I reinstalled the disc in what I thought was the same position, but I could be 180 degrees off. I think. Maybe. Who knows?

If the disc is not in the proper position on the plate, could it cause the locking 1 point relay problem? If so, how would I fix it?

Thanks for staying with me.

4 months later
#11 4 years ago

Hi Wayne,

No, I was so pissed off with that thing that I walked away from it about 2 months ago to work on other machines. I've got to call a friend nearby who has more expertise on EM's than I do. I'll let you know.

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