S2000 power supplies

[idylewild1]

Have a number of win-tact WP203F11 that gives display netplex link down error. Have tried power supplies with no load and in a machine under load and the 13v and 25v appear okay. On each one the 5-6 volts on pin 7 is missing. Does anyone know where this voltage is used or have a good power distribution diagram for this machine ?? Has anyone else seen this problem and if so what was the resolution. Thanks for any help or advise.

[Slottex]

Hope you get an answer I have a machine with the same problem ! If we would have had a volume problem we would be fixed !!!

[PWRSTROKE]

idylewild1,  Not real sure on what your question is.  Are you just testing pwr supplies out or your machine is down and says netplex link down error.  Sounds like you may be looking at the wrong pwr supply.  The main pwr supply mounted on the lower bottom cabinet back wall with the comm interface board(in metal removable housing) may be where to look -Has ribbon running from it to mother board. Also chk your cab. i/o board -seated properly and swap with known good one for good diag. without the pin-out hassle if need be.  Thanks B. and by the way what are you working on-theme/type - .

[dpalmi]

I found the info below on another slot forum that I check out once and awhile when it's slow here, but I admit I have no idea what any of it means...

Dan #2

I have repaired this problem on Win-Tact Power Supplies.  On the 203F11 PS you have two small circuit boards CTR1 and CTR2.  On the CTR2 board you have a voltage detection circuit that monitors the voltage on pin 14 of this board (around 15v).  This circuit supplies a logic 1(over 3v) or 0( 2v or less) to pin 13(PG) and pin 7 on the power connector.  When this circuit puts out a constant logic 0 you get a Netplix error.  The parts are IC-4 Renesas M51957BL, Q-3 2N7000, IC-6 PC817 opto isolator, along with 14 resistors and caps in the circuit. There are 7 Electrolyric cap on this board that should be replace.

I've been talking with Arrow Electronics about stocking the M51957BL.  Their Rep Gary Tuschy is going to try and get them to stock them if there is a need.  A this time the part would cost $0.35 ea.  If your going to work on these please contact Gary at 800 833-3557 ext 4956 or E-mail at gtuschy@arrow.com so he can show a need for the parts.  On the 206F11 the parts is M51957BFP 8 pin SOIC.

If you need schematics I have them for the CP1019, 203F11, and the 206F11 power supplies.  If you want them send me an E-mail.

Glenn Allen EET / Tech III

Three Rivers Casino

541 902-6531

gallen@threeriverscasino.com 
 

[idylewild1]

Thanks for the input. This is very helpful.

[dpalmi]

Hello all!

Just for everyone else, this issue (Netplex down error) is caused by the power supply behind the reels.  I believe what he was asking and what I replied with is how to component level fix that power supply and resolve this error.  Of course, just replacing the power supply would fix it too...

Dan #2

[idylewild1]

That is correct. It is the power supply behind the reels and win-tact is the worse of the lot. The autec and 3Y supplies have very few problems. The win-tact supplies are at least a $100.00 used or repair charges and I'm hopeing to fix them for a few bucks. I guess I'm just a cheap skate !!!!! This seems like over kill if the 13 or 25 volts goes bad the machine would cease to operate.

[PWRSTROKE]

Here is some pics of my "stash"-at least 10-20 more than this- 38 pictured.  When I have one go out (rare) I pop one of these in-They have never failed to work for me to this point. -Thanks B.  These are for ALL diff igt models -NO S+--

[dpalmi]

Hello all!

They have posted some more info on the Delphi forums about this problem and how to fix it....

Check out this link for the details...
http://forums.delphiforums.com/n/mb/message.asp?webtag=slottech&msg=6993.1

A member there also created a great video that walks you through the repair - I tried to upload it to YouTube but it was too big/long...
http://slot-tech.com/interesting_stuff/igt/igt%20power%20supply%20repair%20video/igt%20power%20supply%20repair.wmv

I believe the same guy, Randy, also posted this info....

This kind of repair is beyond me...but it maybe helpful to some of you...

Dan #2

Quote:

Win-Tact Magic Bullet

OK, despite the fact that Slot Tech Magazine has written a feature article on this supply and that the other responders are absolutely correct about the bad capacitors in this power supply, I have some news about repairing this supply that may astound you.

Let me say from the outset that in order to bring the power supply up to full specs for hold-up time (the time between the initial loss of AC input and when the outputs drop out) all of the big output capacitors likely have to be changed. Generally speaking, they will be visibly bad with their domed tops.

HOWEVER, bad output filter capactors is not what kills the slot machine. Even if the +24 and +13 volt outputs are full of ripple, they are not being used by circuits that care. The florescent lamps don't mind the ripple and there is on-board regulation for the CPU that eliminates any ripple. You can leave all the domed output filter capacitors (2200 and 6800 microfarad) in situ and they do not affect the normal operation of the slot machine.

Likewise, while replacing all of the caps on the CTR2 PCB does fix the problem discussed in the Slot Tech Magazine article (the 13 volt square wave output from pin 7 is missing) There is a far easier solution to this problem. I present this solution as a way to make the slot machine work, not as a technique for refurbishing the power supply, which requires the replacement of virtually all electrolytic capacitors, some 24 in all as I recall.

Replace capacitor C50. 100 microfarad, 25 volts. That's all. This is the filter capacitor for an internal power supply that powers the ICs and other control circuitry in the power supply. This is the reason that nothing else works on the CTR2 PCB. Now, why replacing all the CTR2 caps accomplishes the same thing I cannot say as I haven't bothered to research it but I can report to you with great confidence that replacing C50 alone repairs almost all of them.

Just for fun, I challenged myself to see how fast I could possibly make this repair. I opened the case, yanked out the cap with a pair of pliers, leaving the leads sticking up and tacked the replacement cap in from the top by soldering it to the old leads. The entire repair took less than five minutes! Of course, I don't recommend this. It was just for fun (yes, I am a nerd). You should pull the PCB out and replace it properly but even at that, it takes just 10 minutes from start to finish. That's better than the hour it requires to replace all of the caps.

Is this unprofessional (leaving in place components you know to be bad)? Argueably, yes it is. I will tell you that it works and leave the rest up to you. It reduces the repair from one hour labor cost plus $10-13 in parts to 10 minutes labor and 15 cents. I have made this repair dozens of times now. Only one required further cap replacement.

Randy Fromm

[stayouttadabunker]

From what I'm understanding about 20-25 yr. old pinball machines-
the electrolytic capacitors dry up.
Sometimes they "bulge" up...just a hair fuse short of an explosion!
I don't see any difference with slot machine power supplies...
the same goes for the four big caps on the MPU boards.
I'm afraid they will have to be replaced eventually.
Swapping power supplies won't help much because those caps too
will be dead at some point...power supplies last a long time but, not forever...