Broken 1993 Bally S5500 (ProSlots 5500?) MPU?

[mateo107]

I just inherited a sight-unseen 1993 Bally ProSlots 5500 machine.  When I received it, the jumper pins for the battery-enable were broken off and there was no battery.


I believe I fixed that problem (maybe?) and of course received 83F error on first bootup.  Cleared RAM and machine boots up - but I still cannot do a full power off without losing settings.  I checked voltage to the battery leads/connections on the MPU and they're showing + 3V.


I'm also getting random MPU restarts, without pressing the reset button.  When this happens all of the lights on the tree, reel light, marquee light, etc., those do not go off, so I don't think it's a power supply issue but rather an MPU issue. 


Can any advise me on where to go from here.  I have a multimeter and can check voltages, but I'm not super comfy doing that unless I know exactly what and where I'm doing it.


Does anyone have any ideas for me? Any and all help would be appreciated.


BTW, I can tell the MPU is resetting, because the "WINNER PAID" and other LCDs will be lit up - for example, showing 0 credits with DOOR OPEN (S.O) error - then those will go blank for about 5-10 seconds, then they'll come back.

[Badbaud]

Make sure your power supply voltages are within range.
Bally recommends the 5V voltage be set to 5.16V.
Use your meter and check the voltages with the machine on and everything plugged in.

Attached are the test points for the power supply.

[mateo107]

Thanks.  I tested the PSU and my results are attached, i get nothing out of pins 6-7 and 12,13,14,15.


ANy change I could repair something like this myself... or just cheaper to get a new PSU?

[Badbaud]

The important question is, what was your 5 Volts reading?

If you were not reading anything on those other pins you were probably reading them with one lead on ground.
That is a separate circuit which is the AC power into a full wave bridge which then goes to a large filter capacitor which provides 24VDC for your reels.
There is a small power supply board inside that provides +5, +12, and -12 volts DC to the MPU board.
When it fails you cannot adjust the 5VDC voltage to it's required 5.16V. If that voltage is below 5V then your MPU board will act weird and do the kind of things you were describing.

Attached is the spec sheet for the power supply you may need to purchase from Mouser or Jameco Electronics. They are under $20.
When you get it you will still need to adjust the 5V level, via a small adjustment on the board, to 5.16 VDC.

[mateo107]

Got the PSU fixed by replacing the fuse in it.  It looked in tact, but just 'off'.  Replaced and now my PSU is working fine


Now, I still have the issue of the battery not working.


Looks like the header pins broke off and someone tried to repair them, but I get no reading at the pins JW12 to enable the battery...


Any thoughts on where I can scrape off and get back to copper in order to re-attach the battery enable pins?


Photos posted next...

[mateo107]

photo of busted pin connections

[Badbaud]

Remove the board from the tray and make sure the traces that connect to the bottom side of the board, that connect to the battery, are still intact.

[Fredpav]

I also have a Ballys S5500
I’ve just changed out the power supply. How do I go about checking the voltage and then adjusting it. I see there is an adjustment screw on the new power supply. I do see the diagram that is attached with this post. Just don’t know how to do it. I have a volt meter.

[Badbaud]

A few posts behind this one shows the connector pinout and where the voltages can be read.
Put your black lead on GND and read the 5 and 12 volt signals coming from the power supply unit.

[Fredpav]

Thank you!
I will do that.
My problem is all my button lights are out. Coin in, coins accepted, max bet, spin, bet one. All were working then the machine tripped the 5v breaker just after I turned the machine on. Machine was working perfectly. Machine still works perfectly just no lights. Fluorescent work.
Before this problem I had replaced the power supply and battery on the board. The machine was working great then out of the blue the bulb issue happened.
I have checked all connections and resat all the connections on the back plain. The breakers are all in but no power to the lights. So I thought it may be the new power supply voltage.
Any thoughts.

[Badbaud]

The bulbs only use the large capacitors voltage. It is the huge blue capacitor inside the power supply box.
The small SMPS power supply only provides voltage for the board's chips.

[Fredpav]

So the large blue can that is next to the power supply board I ready replaced . Can I buy one of those and is it replaceable. Or is that something I should send in and have replaced.

[Fredpav]

Can I buy that part new? If so do you have the part number? I believe there is some printing on the under side of large blue can.  Or do I have to buy an old used one.
I really appreciate your help on this. Without you and the others on this site,  I would be lost. I have enough knowledge of this make to do some minor repairs.
Again THANK YOU for Your help.

[Badbaud]

I have never found one of those being defective. Concentrate on the connectors on the backplane board.
The large board the computer board plugs into.
Re-seat those connectors.

[Fredpav]

I have reset all of them. Unplugged looked at the pins made sure all looked good. Then refit all of them on the back plane. Were should I go next?

[Sunrise Side]

Maybe the circuit breaker is bad? Breaker is Oxidized or broken inside?

[Fredpav]

I’ve run a non contact voltage detector over the wires behind the breakers. It didn’t sound off when running it over the top 5v wires. But did on the 25v wires. The breaker did trip twice when the incident manifested itself. It’s now pushed in. I will check when I get home.
Thank you again!!!!