S2000 Vision battery replacement issues

[MB75]

Hi,


I had some issues with my MS. Little Green Men. After turned of for a week i started it and it gave me several errors like Maindoor open, BV door open ( which should be impossible since the sensor is bridged ) and another door open ( forgot which one )

After measuring the green Varta ( I know ) it gave 0,5 volt. Leaved the machine on for 15 minutes and measured 4 V.
Then took out the board, after powering down of course and measured during the next hours and battery dropped to 2.5v and later 1.7. So the battery needed to be replaced i thought.

even when the battery was of the board it got back to 3.6 v 

It seemed that there was old green leakage from a previous battery so i started to clean out.

Replaced the green varta with 3 x 1.2 V Rechargeble  AA penlites and cleaned out the green acid. Did it with house hold vinniger and demineralized water.

Left the board to dry after blowing it of with air.

Ones the board got back in the machine i needed to clear some errors and finally got the next issues. Before this the machines worked fine !

Reel 5 Tilt and is not spinning
Telltale Battery low ( which one is this ? )
Closure M but guess this is a standard message

So probably i have created an issue on my board but only cleaned out the area where the battery was. Not much components there. Just 2 big diodes and that coil. btw took these all off the board.

On the mpu the upper LED i on and yellow the one below there is faded blinking.

Super Stepper Controller 7551050 0 REV D

Not sure it had the modification to 755 105 02

Who can point me in the right direction ?
I think there’s a shortage somewhere referring to the battery draining out.
What parts could be the issue and could be replaced to check ?

Thanks a lot !

[sixcardmark]

Varta is not needed, remove the rechargable AA batteries you installed. Telltale is Varta.

[MB75]

Varta is not needed, remove the rechargable AA batteries you installed. Telltale is Varta.

what is the purpose of this Varta ? I’ve read something that they bridge the battery connections, is that neccesary ?

[alex]

The green varta is the telltale battery, it monitors when somebody opens any of the machine doors while the machine is not powered on. It's just a security measure that logs that somebody possibly tampered the machine while it was off.

For home-use it has no benefits, only downsides.

You can remove it (and depending on your board also U16) without any problems and don't need to replace it with anything else.

[MB75]

Since I had some issues when I added an external battery pack I installed a new Varta just to check if the problems remained.

When starting the s2k I needed to reset it several times. All reels spinning but after all settings were made by just resetting the latest error I got was call attendant, reel 5 tilt, closure mb.

What’s causing this ?

I’m not sure what board I have and do not know if I need to remove U16 or U79

[Stayouttadabunker]

With the power switch OFF,  I would 1st turn Reel 5 with my hands - to see if anything's rubbing against anything.
At the same time, checking the reel strips - to see if they are fully inserted into the rims of the reel baskets.
Then I would pull/slide/yank out the #5 reel, locate the reel optics on the hub, and spray some compressed air into the reel optics so that they're clear of any debris, dust, etc, etc.
Now is a good time to completely turn around the reel assembly, and inspect the female pins inside the 14-pin Molex connector housing for any damage.
Most reel connectors occupy 10 pin locations in a 2-row, 14-pin Molex connector...backlit reels use more.
I would also check the male pins on the connector on the back of the reel shelf...make sure none are broken, or bent.
Finally, re-install back the reel assembly onto the reel shelf.
I would watch closely during Boot Up at that 5th reel to see if it's rubbing up against the reel glass display.
You may need to tighten the reel glass display screws a little bit.
That may help to pull the display tighter up against the glass.

Hopefully your inspection and cleaning will eliminate the reel tilt message will go away.
The "Door Closure MB" message is not an error, it's just an informational message letting you know that the door was recently opened and no one has completed a game yet.
If after closing the door, you still get the call attendant message, then power OFF the machine, pull out reels #4 and #5.
Swap those two reels and power back ON the machine and close the door....see if you get a different message on the blue VFD (Vacuum Fluorescent Display) screen.
If you still get a "Reel 5 Tilt" , then there may be a problem with the reel #5 harness or the MPU.
Let us know what you see next Reply.

Oh!
To check what kind of MPU board you have, there are two small, rectangular white labels stuck onto the surface of the circuit board by the handle.
We use the last few digits to ID these MPU's.
It's usually an 8-digit part number like...>>>  P/N: 75510502 or something like...>>> P/N: 75510504
The 2nd label is usually used for the date of manufacturing.

Click on photo below to enlarge if needed...>>>

[MB75]

Thanks for the detailed reply.

i will try to explain what's happening.

I bought the machine and was fully working. Occasionally I got some messages like closure MB but after open and closing the door they go away.

After the machine was off for a week I got a variety of errors. Display went on and of and the machine was tripping a bit. I left is for a couple of minutes like this and after I while I restarted it by powering it down and up and then it worked.

Thinking of a memory issue related to a bad battery I measured the Varta after it was off for 2 days. The battery was 1,5v

Powered it up and left it for 10 minutes. After that I measured again with a powered down machine and it was 4 v.

That was the reason why I wanted to have a better investigation on the battery and battery area.

Strangely at the moment I started desoldering the Varta it was about 2,5v. When it was off the board an laying around for an hour the voltage went up to eventually 3,7 volt.

It looks like there is something making a shortage on the board or components.

So battery replaced with a pack which not worked and then installed a new varta. Needed to reboot several times to get the machine out of it errors and to start the netplex auto config.

At this stage all reels spin like they should.

Since it was still giving some errors I finally needed to reboot again and then the problems with the reel 5 starts.

This tells me that there's nothing wrong with the harness.
Just to make sure I performed some of the mentioned steps like switching the reels 4 and 5. Problem remains on 5.
Since the problems started after it performed the netplex auto config I assume the problem is somewhere in the config or software related.

What components could make these strange issues with the varta battery ?
Why is it charged that quickly and discharging in a couple of days ?

About the board, unfortunately there are no tags on it anymore. I only have the part number on or actually in the board itself.
It is the 75510500 rev D

maybe with this we can check what chip needs to be removed. U16 or U79 ?

[Stayouttadabunker]

You do understand that the Varta is not needed for a machine at home?
It's what they call a "telltale" battery...it "tells" the casino that someone was messing around with the machine while it was OFF.
There's an onboard chip that's part of the re-charging system.

Now's a good time to take a high resolution photo of that particular area of the circuit board, and post it in your next Reply.
There are experts here that will tell you what to do next by taking one look at your photo.

Personally, I've never seen an S2K 500 MPU, although I've heard they exist.
I've only played around with the 502, 504 and newer MPU's.
It sounds like your MPU is one of the older MPU versions, and could very well be hitting over 20+ years old.
That could explain why it's acting weird....it may of said "I've had enough!"  haha

[lookes]

I've repaired several 500 boards. I just did a REV D last week. They are just early 500 series boards. I've seen REV C's too. That board will work fine in his machine since the audio comes from the top box I believe.
I actually do have an audio rework that makes then nearly as quiet as 504's tho. lol...   Without it, they are useless and noisy with an MML2. Worse than 501's.

[MB75]

Yes for sure  was my next step to remove it.

That’s why I was wondering which chip needs to go.

Will try to resize some pics, they are all in high resolution 

[lookes]

U79 needs to go. Don't power it without D3 or D4!  I've seen worse Varta damage but there may be a break or really thinned spot under the conformal coating on one or more of those traces.

[MB75]

Thanks, no D3 and D4 and the coil were taken off to check for damage.

Will remove the U79 and double check the traces for breakage and shortages.

[MB75]

So, after gently removing U79 and the battery I still got the reels 5 tilt error. Swapping the reel with 4 didn’t make any changes.

Investigated the board further and decided to go for an extra cleaning on the battery area which also didn’t resolve the issue.

Took all roms out and saw some leftovers under 1 chip. Cleaned everything and after that it seems to looks fine.  All reels move like they should.

Just had 1 shutdown  screen goos black and it said waiting for display (or something like that)

Probably going to find the issue in the log.

Guess I’ll have to go looking for some new rams.

Thanks all for the effort. 

[Stayouttadabunker]

Took all roms out and saw some leftovers under 1 chip.

I'm am curious as to what in the world did you mean by "leftovers"...broken chip legs? and also which chip?

[MB75]

It was something but not sure what. Guess something from cleaning or flux under the game eprom in U21. Could clean it out with isopropanol alcohol. See picture.

But this wasn’t causing the issues. Think it was either the rams in U19 and U46 or the game proms in U19 and U46.