This was a problem with Olympia models especially. It is caused from not having a ground strap from the door to the case. All you have to do is put a ground wire from a screw on the door to a screw on the case. Usually you will see a ground screw in the case on the power supply or around the hopper.
http://dritz1111.homestead.com/files/ground.JPG
grd
grab a meter out of curiosity and read from electrical grd to your case. bet you find 110v.
I put my digital volt meter to the case. It read about 10 volts then dropped off. I think even the meter was enough load to quickly drain off the voltage, but without the ground clamped down, the chassis potential will drift around.
I fixed my Olympia (Manbou) Machine tonight. There was a ground lug right on the power supply with a clipped off ground wire hanging from it!! I switched the 2 wire cord to a 3-wire cord and put a connector on the cord's ground wire for this lug. The "tingle" from the case is completely gone I didn't need to add an extra ground wire to the front case, but it isn't a bad idea. There are a bunch of wire bundles routed to the front panel, I assume that at least one of them carries a ground lead.
Chris W
Mesa, AZ
Spin-Luck, Dragon Dice
, Super BlackJack, King Camel
Actually....I was wondering about the ground wires on a couple of my machines....they're completely separate from all the wire bundles, and are maybe 4" long, screwed to the door on one end, and to the body on the other....They are, for the most part, out in the wide open.Originally Posted by cwstnsko
Kelly
Marine Carnival, Kiwame
Some of my machines have the bare, braided ground straps connecting various components throughout the machine. Others just use green wires. In the case of my Olympia machine, there are green wires in the bundles, but no obvious ground wires run to the various parts of the machine.
Every machine I have, except the Crazy Shaman, have fairly obvious connection points that are intended to be used to ground the machine externally. In the parlors, they probably ground them separate from the electrical grid to avoid issues with different electrical circuits having slightly different potential on their ground leg. If they didn't have a common ground network for all of their machine independent of the electrical circuit, they'd likely run into trouble with the system that ties all of the machines into the central management system.
The only machine I have left to ground is my Crazy Shaman, and since it's 24V, I'm not loosing sleep over it at this point.
Chris W
Mesa, AZ
Spin-Luck
Re: grd
WHOA!!!!!!!! Tank, as posted above, I wasn't all that concerned about this issue. But, I did make a note to at least check this with a voltmeter. I did so today and two of the machines are OK, but 3 of them have 110V from the case to the plug ground!*
EDIT 04-26-2005 at 02:18 PM. : Mistake in the above -- there was merely some leakage, not 110V.
This will definitely have to be fixed and I no longer consider it a non-issue! Thanks for bringing it up!!! *Everyone needs to take a look at this and just don't blow it off as I did initially. :smt023 *:lol:
Last edited by slotter; 04-26-2005 at 03:18 PM.
Exactly what/where are you testing with the volt meter? A pic would help as I am electrically illiterate (and sometimes verbally too!). :lol:
Just put the black probe of the voltmeter in the ground plug hole of your AC outlet and touch the red probe to your machine case. Have the voltmeter set on "AC Volts" and see how many volts the meter shows. You shouldn't have any reading, but sometimes, you'll have some leakage and it will register a few volts.
But, the full 110 volts is an open circuit just waiting to be completed by YOU or someone in your family making the ground (wet floor, etc. will make a person the electrical conductor) when you touch the case. Not a good situation.
[IMG]http://img.photobucket.com/albums/v6...belgroundB.jpg[/IMG]
I have this green with yellow strip wire coming out of the power supply box. I wonder why it was cut like that? That has 62.4v ac on it. I also have 62.4v ac on the door and the frame. There is a green and yellow wire from the door to the frame like the one in dritz's pic. This is a Babel with 100v power supply. I did run a temp wire to the frame from the outlet screw and the voltage dropped to .04v. Plus the power cord that came with this Paschislo was a 2 prong unpolarized plug, which could be plugged in either way. So I am going to run a permanent ground wire. I think that I am going to open up the power supply box and rerun a polarized ground plug.
I think I will email Grandview to see if I do this change if my warranty will be voided.
*Babel*Azteca Legend*
how hard is it to install a 3 prong cord on a machine?
!!!!!
i tell you and i tell you!! now look at you with that big lighting bolt sticking out of your ..... :grin:
From the looks of it that green/yellow wire was probably the wire that went to the casino ground grid. 62.4V tells me that your ground was probably "floating" half way between the two legs of your line voltage.
Three prong cords aren't hard to install, but they're a little like volume mods in that they vary from one machine to the next. A quick fix is a piece of wire from the chassis to the center screw on the nearest outlet.
I'll try to get a few pics of the Olympia that I switched to a 3-prong plug.
Chris W
Mesa, AZ
Spin-Luck
[quote="cwstnsko"]ah you forget how everyone around here likes to take them out on dates,for a ride, out to the chicken strip clubs, into the exercise yard,etc.
Ya.....gotta take our time, there's no quick screw to the nearest outlet....there's wire clipping and tinning, belly polishing, scuff removal, a couple drinks, play thru a bonus round, refill the hopper......Lots of time and effort.
Kelly
Marine Carnival, Kiwame
This is my PM to Stealth. (By the way I PM the wrong vendor I should have sent a PM to Grandview that is vendor for CostCo)
---------------------------------------------------------------
I bought a Babel from Costco end of Dec 04. I would like to put in a grounded polarized plug. I get 62.4v ac on the door and frame and this green w/yellow stripe wire that is coming out of the power supply box which is cut and flopping in the breeze. Will this void my warranty?
AL (czyotto)
_________________
Babel Epselon got rid of
-------------------------------------------------
This is my answer from Milt
Not at all as long as you know what you are doing and don't fry the power supply!
Milt
I am waiting for a reply from Grandview
*Babel*Azteca Legend*
I have also installed 3 prong cords to all my machines for extra safety. It is easy to do. All you do is cut of the old 2 prong cord and wire in a new one. Then wire the ground line to the case ground. This will ensure all ground goes to the ground in your house. If you have a transformer just unconnect the old plug and install new one. Computer cords work good. They are 6 feet long and a fairly cheap. Just cut off the female end. Then just use wire connectors and wire holders to keep the wires from being pulled out.
****Make sure unit is unplugged before cutting any wires.****
3 prong connection
There is one extra connection because I wire in an outside power button also. So I don't have to open machine to turn on.
Power Mod
Do you put a heavy duty toggle switch on the back or side of the machine?
*Babel*Azteca Legend*
I took an extension cord with a 3-pronged grounded plug and cut the hot and common (black and white) wires off of it and taped them off. That left me with only the ground wire left on the plug. (Left about 18 inches of the ground wire still on the plug.) Then ran wires from a screw on each machine's power supply and hooked those wires to that ground wire left on the plug. Stuck the plug in the grounded surge protector and Viola! no more voltage on any of the machines. 8-)
My solution was an easy one, but I have to say after looking at dritz's pictures, his is an excellent job! I was making do with stuff I had laying around the house and not wanting to have to go buy cables, etc.
Great job and great pics, dritz! :smt023
Grounding
You guys are causing me to bite my knuckles.
Just some background on me - By profession (for a very long time) I'm a broadcast engineer (I build radio & TV stations) and master electrician in NJ, NH & VT. So I work with this stuff everyday.
I don't own a 100volt machine, only 24 volt units. So not having a power supply to open up and play with, I can only guess the following:
Remember, only assuming! Some power supplies use common-mode rejection transformers. These are center taped. 100V is applied to the outside terminals and the ground is connected to the center tap. We use this system in high quality radio studios. It cancels out the 60 Hz hum that gets into the audio circuits.
If they use this in the machines, you will measure half voltage from the green wire to chassis ground or earth ground. That's normal.
Someone let me know what you find.... Unplug the machine and take an Ohm meter (x1 scale) and measure from the green (green/white) wire to some metal parts of the machine. Say, power supply box, rails, etc.
I'm hoping that you will see a dead short. And that's good. If so, grounding to the ground pin on a standard AC outlet is the right thing to do.
But! before you plug it in, do one more test for me. With the power switches on (not plugged in), measure from each plug prong to the same metal parts you measured above. The meter should show open - very high resistance. If it doesn't, there could be a fault or you may be encountering a bleeder circuit (a circuit that drains any charge in the power supply when unplugged) or a surge protector. Some equipment use MOV (metal oxide varistor) that short to ground when there is a spike on the line.
_._ Walt
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