Author Topic: IGT Slot Machine Error 21 (Read 4801 times)

Stayouttadabunker · « **Reply #20 on:** November 17, 2020, 11:39:38 AM »

It's pretty simple really but it may not solve your [21] problem.

If you disassemble the coin in optics, you will see one small chip marked as "Q2".

Take a small flat screw driver and break it off and reassemble the coin in optics.

The coin in optics is sometimes part of the [21] error code problem but works in conjunction with the coin comparitor.

Plus taking it apart forces you to clean it better.

CaliforniaDreamer · « **Reply #21 on:** November 17, 2020, 11:50:47 AM »

That seems fairly easy, is Q2 a small cap? Also I should note that the coin comparator itself (the part with the coin in it) does not have any wiring to it. Is that normal? From my past clearing of error 21 (cleaning and replacing the coin) it has never had a connection to the rest of the system.

Stayouttadabunker · « **Reply #22 on:** November 17, 2020, 11:59:49 AM »

Quote from: CaliforniaDreamer on November 17, 2020, 11:53:45 AM

....Also I should note that the coin comparator's plug is not attached to anything and has always been that way.

Woops double post, couldn't see the first one.

Whaddya mean by this?
That's why you're getting the [21]!!!

Plug it in!

Can you show me what you have going on in there around the coin comparitor?

CaliforniaDreamer · « **Reply #23 on:** November 17, 2020, 12:12:07 PM »

There is no plug that would attach to that connector.

There has never been a plug attached, only some black tape over the plug. Is it possible that there use to be a jumper between some of the pins and it has fallen off? There is a three position Molex plug there but no way it would fit.
BTW when I say coin comparator I mean the top part with the coin in it, the part below that does have a plug into it.

Stayouttadabunker · « **Reply #24 on:** November 17, 2020, 12:14:48 PM »

There is a jumper if the machine is rigged NOT to accept coins anymore.
Yes...it is possible it fell apart and now you're getting [2] errors.

Was this machine accepting coins when you got it?

I would like to see the black tape and what's UNDER it.

Below is a picture I made years ago to show newbies what connector goes to what in there because I have no clue which one you're talking about.

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

CaliforniaDreamer · « **Reply #25 on:** November 17, 2020, 03:34:05 PM »

Sorry it took so long to reply but I was having problems with iPhone to computer transfer of photos. In any case my cable looks just like yours. As you can see by the photos the connector on my comparer does not match any of the connectors on the cable.

Stayouttadabunker · « **Reply #26 on:** November 17, 2020, 03:44:59 PM »

You need a coin comparator harness like this...>>>

CaliforniaDreamer · « **Reply #27 on:** November 17, 2020, 03:49:57 PM »

Sounds good, how do I get one and from where? Makes sense cuz it looks like some of the pins are jumped. If I had the sematic I could make one assuming I can find the connectors. The molex one would bb easy, don't know about the other connector.

Stayouttadabunker · « **Reply #28 on:** November 17, 2020, 03:54:42 PM »

Easier just to place a WTB ad in the Classifieds section of NLG

Just use the photo I posted above^^^^ and state that it's for an IGT S+ machine.

Someone will spot your "Want To Buy" ad and contact you.

What bothers is in your very first post in this topic, you said that the machine "...that was working fine..."

There's no way in the world that coin comparitor could have ever worked without power being applied to it.

Which Molex housing had "Tape" on it?

Were you ever able to insert coins for credits?

CaliforniaDreamer · « **Reply #29 on:** November 17, 2020, 04:05:27 PM »

Yes, it did work fine. And yes it accepted up to three coins a pull. Is it possible that there is a hack on the computer board that allowed a bypass? The one picture shows the connector with the tape on it.

jay · « **Reply #30 on:** November 17, 2020, 04:30:56 PM »

I would agree with Mark that there is no way that comparitor ever worked.....

You "can" use a manual coin comparitor....
I use the term comparitor loosely as there is no sample coin. It simply works on size and weight.
Imonex is a common one that is used.

To make it work they cut the lead on Q4 on the optics board. If this is the case getting a new harness for the comparitor isn't going to change the state of the nation.

I am now wondering if perhaps the optics are dirty or the optics have gone bad.

You could remove the optics board, open it up (its two plates held in place by 4 screws and spacers). Clean the optics with a qtip and water (never windex or other chemicals).
In casinos they used to give out wet towelettes in little packages as the coins used to turn your hands black. Think of what 30+ years would do to optics - easy to imagine what could be fouling them up.

Ken · « **Reply #31 on:** November 17, 2020, 04:35:48 PM »

Basically the same thing everyone else is saying. Try the Q2 or Q4 removal. Looks like US Gaming shopped out the machine and the coin comparitor may be jumped. The comparitor is just used as a guide for the coin in that case. That harness won't do you any good unless you have a good working comparitor.

CaliforniaDreamer · « **Reply #32 on:** November 17, 2020, 04:54:09 PM »

I have opened up the optics unit and cleaned the photo sensors and light LED's with q-tips and it made no difference. I will try the Q2 Q4 thing next.

Stayouttadabunker · « **Reply #33 on:** November 17, 2020, 09:12:58 PM »

So, US Gaming did a hack on the part of the door harness where it goes to the coin in optics board UNDER the coin comparitor.
Ken, would you know what pins they jumped on the harness to bypass the coin comp?
There's no way I can tell from CalDreamer's photos.

Wouldn't it have been easier to just take the rake off the coin comparitor or did they sell the CC harness for $40 on ebay? haha?

Ken · « **Reply #34 on:** November 18, 2020, 01:33:12 AM »

Mark. It's been to long to remember how it's done.

Jim · « **Reply #35 on:** November 18, 2020, 08:51:40 AM »

Just want to make a few things clear. Long story short, I was involved in coming up with that"hack job" to be able to use a mechanical acceptor in the S+ machine, actually we used IMONEX acceptors , they made several versions of this acceptor, we used the one that would accept .900 through .984 metal discs. ( tokens or quarters). in order to do this, we had to take away the interaction of the optic board to the cc-16, on earlier models, the five pin optic board, you had to clip the diode next to the 555 timer to do this, on later models, you removed Q-2, and on the latest version you removed Q-4. Now you could put anything in that space to get a coin to the optics and it would work, even a direct chute into the optic!

Back in the day when S+ machines came out of the casino they removed the CC-16 because they were very expensive, so in order to play the machine we had to come up with a way to work around the absence of a CC-16.

The only function of the CC-16 is to accept a metal object that is used as a sample, that sample coin sets up a electronic signature for that coin, as other coins are inserted it compares the signature of the sample to the one incoming, if they compare then the rake is moved back and the coin is allowed to go on to the optics, if it doesn't compare, it gets rejected.

So in this case, they are using a non functioning cc-16 to do that! get the coin from the coin head into the coin optic, the machine will work as advertised,

usually a code 21 means one of the optics is not reporting back to the cpu as operating. this could be an intermittent plug on the optic board or a wiring issue in and around the harness that connects the optics to the machine harness. the same thing that happens to the power connector on the motherboard happens to the connector on the optic connector, the contact gets dirty or looses connectivity due to being wiggled or moved many times,

the best way to see what the optics are doing is to do the optic test ( if you can get into the test mode)

Hope this helps
Jim

Ken · « **Reply #36 on:** November 18, 2020, 08:57:24 AM »

Quote from: Stayouttadabunker on November 17, 2020, 09:12:58 PM

So, US Gaming did a hack on the part of the door harness where it goes to the coin in optics board UNDER the coin comparitor.
Ken, would you know what pins they jumped on the harness to bypass the coin comp?
There's no way I can tell from CalDreamer's photos.

Wouldn't it have been easier to just take the rake off the coin comparitor or did they sell the CC harness for $40 on ebay? haha?

Now we know Jim did it. I even have some imonex acceptors.

Stayouttadabunker · « **Reply #37 on:** November 18, 2020, 09:15:59 AM »

I didn't mean "hack" in a bad way Jim! haha
I apologize for my poor choice of word.
Many guys hated when I made the door optics bypass to the cherry switch!

I think that was awesome what you had to do to get the machines to accept coins!

I would compare that work and innovation to the stuff other gentlemen have done like for example: to make TITO tickets to work on our home games...just as remarkable!

jay · « **Reply #38 on:** November 18, 2020, 09:53:17 AM »

So it sounds like if we can get a new set of optics with Q4 modified then we should be good to go +/- wiring gone bad.

Ken · « **Reply #39 on:** November 18, 2020, 09:56:12 AM »

Quote from: jay on November 18, 2020, 09:53:17 AM

So it sounds like if we can get a new set of optics with Q4 modified then we should be good to go +/- wiring gone bad.

I agree with Jay.

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Author Topic: IGT Slot Machine Error 21 (Read 4801 times)