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I have a mikohn/sigma Yahtzee machine. The display on the top box when I boot up is scrambled with upside down numbers and letters. Then it shows a C3 then quickly shows a C with a backward 6. Does anyone know what this could be and how to solve? Thanks for your help. Koni

Koni,
did you , by any chance, try to change the display settings at all?
The reason I ask you this is because the display error code "C3" could be a number of things...
From the manual>>>>
Mikohn error codes (pre-1998)

"C3" Verify error on data written to RAM on LED logic. Jackfile to long?"

That means someone tried to change the message in the jackdo files but entered it incorrectly.

Let us know if your mikohn is newer than 1998...if it is, than the controller error code message is a little different.
The error code after 1998 for the "C3" is this:

"Slave controller does not detect master controller. Improper switch setting on controller?"

Now that code only applies to when you have more than one controller...

It's gets more complicated....if you have a CHAM2+ display, than the "C3" error code means this:

"C3" = Test pattern written to RAM on logic when read back has been corrupted"


We need more details of which Mikohn controller you have, how many, the settings on it and what kind of Mikohn displays you are getting this error code from....it's the only way we can help you....
It's sort of like...."I need some tires for my Ford" and the guy at the counter sells you giant, knobby tractor tires for your Pinto....there are both Fords, but very, very different. :96-

Look inside and get all the numbers you can off of it and maybe post a couple of good claer pictures as well...

Thanks- The controller board on the power sopply say 1993 and the label is 341-016-10 cham2, c/s log2, 8mhz. The display board has two labels. The left side is 341-012-90c graph drur2 and the right one says 341-009-14 250 graph disp. See attached photos

Here are more photos. Thanks you for your help.- Koni

I did scroll through the test settings and they are also scrambled. I have not tried to change the settings because I have no idea how too. The c3 error comes up sometimes when I power up, not always??? Thanks- Koni

I never seen the display show letters and numbers backward and upside down...something is seriously wrong there...
It's like the display is turned inside out!
I'm hoping one of our members that has a working cham2+ can elaborate more on this!
I believe IDESIGN has that kind of Mikohn system set up...

Is it possible to clear or reset the board? If so how do you do it?- Koni

Koni
Did you get your Yahtzee Sigmas working?  Someone told me to reseat the memory, not sure where that is.  I have 4 of these machines and one parts machine.  If you can shed some lite we would be greatful.  The of the machines have something in the LED reference the bonus and P-- bet 3, one had nothing in the display and the other was playing fine, however; we were playing and now it is frozen.


thanks for your help


Caroline

Caroline,
Yes I got the yahtzee machine running and I would be happy to help you. What exactly is the machine doing from the power up, and what were you doing with the machine when the problem happened? Also what have you done so far to correct the problem? The more info you give me about what the machine is doing the better.
Koni

That CHAMII is made to drive a different display.  Also, that CHAMII is not a Stand Alone unit.  It relies on a CON2 to drive it.  The photo of the back of the display is too blurry to tell but it looks like is 4" tall, not 2". 

Did that CHAMII come with the machine?

Koni-

Would you mind posting here how you got your "backwards" display working properly again for the benefit of someone in the future who may run into the issue that you were able to resolve?  Thanks in advance!  :89-

Sorry Folks,
I did not mention how I fixed the problem. It ended up being the board attached to the power supply on the right side of the cabinet. The board was wrong and did not even have the "Yahtzee chips" in it. Easy fix,  just wish I checked the board and chips first. Amazing how I sometimes overlook the obvious. Thanks to all,- Koni

I am totally puzzled by all this.  I sure would like to know too.

The display is now working properly?

Yes, the display is working now. The machine runs perfect. The machine was not working when I bought it. The wrong board was in the machine, I think someone was trying to make the display say something custom :103- and installed a different board. The board attached to the power supply on the right side controlls the display. When I installed the correct board the machine booted up and runs perfect. Sorry for the confusion folks. :279- -Koni

What kind of board was used to make the display work correctly?

Can you post a picture of that board? It might help someone else out.

My casino room floor got water damage from tropical storm Lee so I am on vacation next week fixing it. I had to move all my machines so I will try to remember to post a pic of the correct board. Good news is it is a great excuse to remodel.  :3-
Koni