Sigma SG50 Power Supply Help

[wolfetrac]

Hello, I have a Sigma SG50 with a bad power supply.  Mine has the 3 separate power supplies mounted behind the reels.  One is 5V.  Second is 12V.  Third is 24V.  The real question I have, there  is a much smaller Forth power supply mounted just below the 3 larger ones that says 100V.  It has the number KS-1503A on it.  No other info.  I suspect it is some kind of transformer or converter.  I am replacing all 3 of the DC power supplies and also want to replace this but can't find any info on it.  I suspect it is 100V  AC  but since it is not putting out anything, I have no idea what it is.  I would also like to know the amps of this as well.  I am trying to upload a picture but having some technical difficulties.  Thanks, Richard

[Amechanic]

It’s possible that 100v transformer was used buy the casino. I’ve only seen these with the other 3 voltages.

[wjpelka]

I have a Sigma SG-50B and it has a single power supply. It is a NFS80-7602-C. It has +5, +12 and +24 Volts DC on board. It appears that they are not a stock item but there are single power supplies out there that are plug and play for it. Jamesco electronics has one that I was considering, but mine turned out to be okay. If I can post files and info, I will. Remember, Google is your friend...My other computer with info is out of reach... I'll watch this post and see if I can find what Jamesco has that will work. I go the info from another member, so maybe they will reply to your post...


Bill in Spokane...

[Jim]

which one is bad?  each one has a red LED on the supply indicating that it is on, measure the voltage from each one and see which one is bad. I have the complete panel, it usually has the three power supplies and an isolation transformer rated at 100vac. red wire is +5, the orange wire is +12 and the yellow wire is +24 vdc (from memory, so I think those are the colors)

let me know what you need!.

Jim

[wolfetrac]

Jim, all 3 power supplies are testing bad. Verified there is 120vac going to them.  No output.   I have found replacements for all 3 power supplies made by Mean Well but I can't find an Isolation Transformer.  I did discover the Isolation Transformer needs to supply 17vac according to the SG50 wiring schematics.  Mine may be good, just wanted to replace it since i was putting in all new power supplies. 

[Amechanic]

Question.. Have you checked for bad caps in those three PS? I had a Sigma a few year back that had one bad PS. I found 1 bad cap inside. Once replaced the PS worked again. I just had to adj the output voltage..

[wolfetrac]

No, I don't know how to test the caps. 

[MacGUYver]

You might have already done this, sorry...

 quick and dirty capacitor visual check.  First and foremost, YouTube it real quick.  If you don't know what capacitor s look like, most are radial, ie a cylinder with two wire legs.  The ones in the power supply will be "scored" on top.  There's two basic tests:


1) look horizontally across the top.  If it's popped up, the score marks are not flush, it's most likely dead.  They score the top to allow the caps to pop up and not explode all over.  This raised roof means replace it.


2) look for leakage out the bottom , or top too.  If you see leakage, that's bad, replace it.


If you replace any, just pay attention to polarity.


I had a sigma powersupply that was dead.  Tried a cap replacement on all but was still no go.  No one had a direct replacement, found an expensive onrle from jameco.  But than decided to just buy each individual voltage ps from eBay and made my own little harness.  Was like $25 or something, just had to wait the 2-8weeks from china shipment . Just have to make sure you buy eniugh wattage/amps, I think it's defined in the manual.  Either that or I derived it, I forgot.  Good luck!

[MacGUYver]

Also, you did check the fuse in the PS, right?

[wolfetrac]

Checked the Caps & Fuse.  All looks good.  I purchased  a replacement unit from Mean Well.  It is working great now.  Thanks for everyone's help and useful suggestions.   

[Amechanic]

So I just you can post this solved.

[Flappa]

Wolfetrac, What powersource did you order from Mean Well? I have the same Sigma slot machine and think I need a new power source. TIA

[Pwrcloser@aol.com]

I would like to know as well.

[Chris-socal]

I replaced all 3 with new switching units from Ebay. They are physically smaller so you have to do a little work to get all the connectors into the screw posts. Just look for units with at least the same amps, its ok to go higher.
I tried recapping the originals but they had a LOT of caps and a ton of trace damage. Just not worth it.

Chris