New Life Games LLC
**Video Poker, Keno, Slots, 21** Gaming machines => SIGMA Video Games => Topic started by: markb7605 on August 07, 2017, 04:26:42 PM
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Can anyone help Sigma blackjack machine
i turn it on and it goes to self test then comes up like this. it was working fine a few days ago
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The board has many chips in sockets. I would recommend removing each chip and cleaning the legs with a soft pink eraser then plugging them back on.
WATCH THE NOTCH on the chip, make sure it matches the notch on the socket.
If you plug a chip in backwards it will be destroyed. If you bend a pin the chip will not work.
If none of that helps you may want to send the board to us, we have a Sigma tester and spare parts for them.
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The only other thing I could suggest is to check your power supply's voltages. Not sure what yours has, but I've seem some machines have one piece power supply's with 5V, 12V, and 24V. Then I've seen two power supply's, 5V & 12V. Then a 24V. I've also seen some that had a voltage adj knob to fine tune the voltages. Sigma machines I've picked up, all had PS problems. I e been able to fix some by replacing capacitors inside them.
Have you checked the battery's voltage?
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not finding a battery any where
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not finding a battery any where
More I think about it, I think the Sigma boards used a Round disk.. I think they are a capacitor, about a 1/4" to 5/16" thick, and about the size of a nickel to quarter.. Can you post a picture of your board..
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pic
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Take a look at the round object in the lower right corner (circled below) and see if it isn't one of those "supercaps" that is a capacitor that acts as a battery. There may be a notation on the circuit board saying "BT1" or "Batt" or similar.
(click to enlarge)
(https://s2.postimg.org/7cftxy0p5/image.jpg)
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it says 5.5v 1.0F
but with my meter its at 4v
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Can you post a clear closeup photo of the round object so we can see details?
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it says 5.5v 1.0F
but with my meter its at 4v
yeah, that's a supercap. The "1.0 farad" size is the giveaway. I think the 4 volts with the board out of the machine maybe means it is ok, but I'm not a Sigma expert. Hopefully someone here can say if 4 volts is too low. With the machine powered up the supercap should charge to 5 volts or close to it. But anyway, if you ever need to replace it you look for a supercap with the same specs (5.5 volts, 1.0F).
Do you have another Sigma cpu board to compare it to?
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ill put it back in and see if it comers up with it on
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If the 4 volts isn't enough to keep the data in the cmos ram intact that might be what is going on with your problem. On power up some machines check the cmos ram data to see if it is corrupted, a bad battery can cause that, and if the cmos data is corrupt then the machine halts or goes squirrelly. That might explain why the machine was working fine a day or so ago, now it doesn't. Something just went bad, could be the battery/supercap, but that's just a guess.
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4 volts is fine. If it goes below 2.8 volts the RAM will not have the voltage necessary to retain it's memory.
But it could be the RAM chip is bad or needs to be re-seated due to dirty socket contacts.
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ok, thanks for confirming.
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i re seated all chips and still not working dose anyone know where to get chips for it i can start there
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Try this, remove the RAM chip and crash it manually by placing all of it's legs onto a sheet of bare metal.
Hold it in place for about a minute then plug it back in and power up the game again.
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Is it just the 6 Game chips by the super cap battery that are in sockets? I would think the Ram chip would be too.. Also I see a bunch of small capacitors on the one corner of the board. It's possible ones bad, but I don't see any with bulging tops. Really need to test them with a cap Tester.
Did you locate the machines power supply to check voltages? I had one years back that wouldn't work. Found the 5V was too low. Luckily it had an adjustment pot to increase the voltage back up over 5V to about 5.5V.
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5v is reading 4.9 the 12v is reading 11.9
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Mark, I would suspect the power supply, I have seen very few boards go bad, but a ton of power supplies go south. Sigma's are like Bally when it comes to power supplies, you need at least 5.1 volts . just my 2 cents.
Jim
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You could open up the power supply and look for a bulging cap. Can you post a pic of your power supply?
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i turned up to 5.3v and the 12v is at 12v
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Do you have any compressed air to blow it out. Did changing the voltages help?
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changing didn't do anything ill try to get blown out tonight and post new pic
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Blowing it out won't help, but will give us a better view for damage. Sounds like we might be back to the board.
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If push comes to shove our shop has spare Sigma boards, schematics, and a Sigma tester.
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where are you located
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Las Vegas, NV
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blew out power supply
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i put power supply back in and its working fine now. must have been bad connection on power supply thank you everyone for the help.
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Glad it's working. You could have have a loose wire connected to your powe supply.