Author Topic: S Plus Motherboard Resistor Question. (Read 3631 times)

Stayouttadabunker · « **Reply #20 on:** November 18, 2019, 07:08:59 PM »

I don't know if this will help you or not as far as diagnosing...blow it up and you can try some of the stuff on it.

The document shows some tests you can try on the bottom...>>>

Eddie · « **Reply #21 on:** November 19, 2019, 05:06:06 AM »

Quote from: Stayouttadabunker on November 18, 2019, 07:08:59 PM

I don't know if this will help you or not as far as diagnosing...blow it up and you can try some of the stuff on it.

The document shows some tests you can try on the bottom...>>>

Wow Thanks ! This may help alot. I wont be able to test anything however until the resistor arrives.

I want to reinstall the boards after that is done, then power up the machine to see if it would work.

I leaning towards a failed chip because I dont understand how the Hopper motor is energized and doesnt stop rotating on power up.

Badbaud · « **Reply #22 on:** November 19, 2019, 06:31:18 AM »

Next step may be to run a clear chip.

Stayouttadabunker · « **Reply #23 on:** November 19, 2019, 08:58:25 AM »

A runaway hopper can be that there's some credits it's trying to pay out/ pay off but the hopper optics aren't counting.
I agree with Badbaud, after you either fix that motherboard or swap it with a new one, clear the RAM and start anew.

Eddie · « **Reply #24 on:** November 19, 2019, 11:19:06 AM »

Thanks so much guys lets see what happens when I get the resistor and boards reinstalled.

Eddie · « **Reply #25 on:** November 23, 2019, 06:33:39 PM »

Hey guys the resistor finally came in and after I installed it nothing changed. Here is a video of the problem.

<a href="http://youtu.be/QzUhYxm6YdU" target="_blank" class="aeva_link bbc_link new_win">http://youtu.be/QzUhYxm6YdU</a>

sixcardmark · « **Reply #26 on:** November 23, 2019, 06:45:04 PM »

The coin comparitor should not be lit when door is open. Did you clear machine?

Badbaud · « **Reply #27 on:** November 23, 2019, 06:50:56 PM »

I agree, the comparator should be off with the door open.
Wonder if the door detect circuit on the MPU board is bad, maybe a reset is not possible because a closed door is never detected?
Definitely running a clear chip would be the next step but door detect may be a related problem.

Eddie · « **Reply #28 on:** November 23, 2019, 07:02:22 PM »

Quote from: sixcardmark on November 23, 2019, 06:45:04 PM

The coin comparitor should not be lit when door is open. Did you clear machine?

When you say clear the machine do you mean with the cylinder key? There are no displays so I cant tell what its doing.

Badbaud · « **Reply #29 on:** November 23, 2019, 07:19:55 PM »

You need to get a clear chip that plugs into the SP chip's socket and clears the RAM on the MPU board and the EEPROM on the backplane board.
Many people on this forum sell them including instructions.

knagl · « **Reply #30 on:** November 24, 2019, 04:22:06 PM »

I don't think a clear chip is going to do it -- there's some kind of a short going on. Normally the lights including the candle lights would not all be on steady like that, nor would the hopper run continuously. It would be a good idea to make sure there aren't any stray coins, washers, etc. stuck under the motherboard (the fixed circuit board in the bottom of the machine that the MPU board plugs into). If you power the machine on without the MPU board plugged in, does anything unusual happen?

I would consider trying a known good MPU board in there once you've verified that you don't have any stray coins laying around in the machine. I suspect that your current MPU board has some issues.

Eddie · « **Reply #31 on:** November 25, 2019, 06:59:22 AM »

There is nothing under the mother board. I removed it for rework and cleaned the entire area inside the machine. I wouldnt want t have to order a new boardset if it might not be that, or if I couldnt fix the boards I have.

If I power up the machine without the MPU what should I expect to see as far as things getting powered up?

Stayouttadabunker · « **Reply #32 on:** November 25, 2019, 09:09:23 AM »

Quote from: Eddie on November 25, 2019, 06:59:22 AM

If I power up the machine without the MPU what should I expect to see as far as things getting powered up?

If you start up the machine without an MPU....>>>

1). The 25cent display lamp should on but nothing will be showing in the [Winner Paid], [Credits], or [Coins Played] displays.
2). All the fluorescent lighting should be on. (Belly, Reel glass, and Topbox)
3). The topbox candle should be off.
4). The reels will NOT be energized or "stiff".
5). Any fans will be on.
6). The hopper should be off.

Eddie · « **Reply #33 on:** November 25, 2019, 07:42:37 PM »

Quote from: Stayouttadabunker on November 25, 2019, 09:09:23 AM

Quote from: Eddie on November 25, 2019, 06:59:22 AM
If I power up the machine without the MPU what should I expect to see as far as things getting powered up?
If you start up the machine without an MPU....>>>

1). The 25cent display lamp should on but nothing will be showing in the [Winner Paid], [Credits], or [Coins Played] displays.
2). All the fluorescent lighting should be on. (Belly, Reel glass, and Topbox)
3). The topbox candle should be off.
4). The reels will NOT be energized or "stiff".
5). Any fans will be on.
6). The hopper should be off.

I powered up the machine without the MPU board and it did exactly what you wrote and the coin mech LED was off too!

If this is a chip issue any ideas which chip it could be?

Turns out my chip tester is too small for the socketed chips on the MPU

Tilt · « **Reply #34 on:** November 25, 2019, 08:07:12 PM »

Time to buy a working MPU board or send yours off for repair. Badbaud works at K-lar and it is the only place I know of that can still repair them.

Stayouttadabunker · « **Reply #35 on:** November 25, 2019, 09:33:35 PM »

I agree with Tilt...plus you'll have a spare board to swap with later on.

Can you check a couple of things for me?
Slowly...and I mean slowly remove your chips from their sockets.
I'm suspecting a folded -under chip leg.
Also, carefully check ALL the pins on the bottom of your MPU....none are touching?

Be honest here...did you EVER remove or install the MPU with the power accidentally "ON"?
Did you hear anything make a slightly "crackle" or "Pop" sound?
How about smoke? Does anything smell burnt?

Eddie · « **Reply #36 on:** November 26, 2019, 05:10:43 AM »

I removed the chips during my initial board inspection and cleaning.

No pins were damaged there are no burns on the board at all it looks pristine.

The caps all look fine no apparent leaks.

The transistors test fine no shorts.

I reworked all of the pins on the board and any possible cracked solder joints.

I Never remove boards with the power on.

The machine was working perfectly until power up last week when the issue was just there.

I reworked the Mother board cleaned it reworked all of the pins, ( Desolderd ,Cleaned ,Resoldered then cleaned again)

The only thing that was burned was on the Mother board resistor R3 which was toast but I replaced that.

Also the area of one pin, on its housing on the mother board connector, was slightly brown, Not the pin just the housing over its area. but I

replaced all pins in that housing.

I restore and Repair Pinball machines so I have do board work all of the time so if I have to remove a soldered chip or Cap its no problem just need to know which.

One

Stayouttadabunker · « **Reply #37 on:** November 26, 2019, 10:43:30 AM »

Good...sounds like you can work with electronics okay.
Well...it won't hurt to have a spare board to compare with that's for sure.

It sounds like the motherboard is pushing all the other voltages thru....you're just not getting any logic signals from the MPU other than "stiff" reels.
Also, you're getting weird logic signals that are making the candle act weird as well as lighting up the coin comparitor light when it's not supposed to.
Other thing are wrong as well, hopper energized, door optics probably out, etc.

Signals are crossed somewhere on the MPU making everything screwed up logically.

Eddie · « **Reply #38 on:** November 26, 2019, 11:49:09 AM »

Quote from: Stayouttadabunker on November 26, 2019, 10:43:30 AM

Good...sounds like you can work with electronics okay.
Well...it won't hurt to have a spare board to compare with that's for sure.

It sounds like the motherboard is pushing all the other voltages thru....you're just not getting any logic signals from the MPU other than "stiff" reels.
Also, you're getting weird logic signals that are making the candle act weird as well as lighting up the coin comparitor light when it's not supposed to.
Other thing are wrong as well, hopper energized, door optics probably out, etc.

Signals are crossed somewhere on the MPU making everything screwed up logically.

If I were to get a new replacement board is it possible that one of the Chips (Game,Sound etc is corrupt and the issue would just carry over to the new board and possibly damaging it?) Would I have to order replacement chips as well to be on the safe side?

I really dont know anything about how these boards work and the common issues.

Jim · « **Reply #39 on:** November 26, 2019, 12:20:31 PM »

Send me the boards to test! I have a S+ tester, and a test machine to put the mother board in. I won't attempt to repair the board, for me its not worth the time versus the cost of a replacement board.

At least you will know where you stand. you will be out 28.70, 2 way shipping, USPS medium flat rate box.

I can also test your chips in a board I have.

let me know

Jim

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Author Topic: S Plus Motherboard Resistor Question. (Read 3631 times)