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Author Topic: 1983 Double Up Cal Omega machine  (Read 22618 times)

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Offline rokgpsman

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Re: 1983 Double Up Cal Omega machine
« Reply #20 on: August 13, 2015, 08:58:06 PM »
I tried to loosen the screw holding the heat sink on, but the nut underneath the component spun with it.  I don't know if I can get anything on the nut to keep it in place to remove the heat sink.  If I get really adventurous, I could try to desolder the component, but I'll probably hold off on that for a while.

I'll see if I can trace the circuit from the motherboard to the gameboard where those resisters were.  It'd be interesting to see if they were part of that situation.

You don't have to get the heat sink off for inspection if doing so is going to cause damage, but since it looks like the over heated trace leads to the part under it I thought it might be a good idea to look under it if possible. Your call.

If the heat sink nut is under the electronic part and just spins when you try to remove the screw then I guess the part would have to be unsoldered to get it all apart.

If you can locate the wiring diagram for the machine or even one similar then it would be easier to track down that circuit and the parts in it.

If the circuit boards are simple 2-sided boards (no traces internally to the board, all traces on one side or the other) then tracking the connection should be fairly straight-forward with your eye or a meter. You can follow the trace from the over heated resistors to a board connector, then thru its mating connector to that second board and so forth. See if it leads to the board with the heatsink part.

Maybe someone here that has worked on these models can give better advice to get you started. Wish I knew more about it.

Below is your photo of the mpu board, I've added some notes to it to maybe help you get familiar with it. Keep in mind I don't have the schematic or any drawings for your machine and I've never worked on or even seen one, so my notes are just guesses from looking at the photo:
« Last Edit: August 13, 2015, 10:44:07 PM by rokgpsman »
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Offline arcade_jim

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Re: 1983 Double Up Cal Omega machine
« Reply #21 on: August 14, 2015, 07:54:05 PM »
You mentioned earlier that the crt monitor lights up. Is there an image or anything on it, or just a blank white raster? If you get a lit screen that's good sign the monitor might be ok, just needs the mpu board to work and provide the video to it.

There is an image that shows on the screen. It's hard to read, but from looking at other images online, it looks like a normal layout of five cards and a payout schedule.  None of the buttons light up, though, and pressing them doesn't seem to do anything.

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Re: 1983 Double Up Cal Omega machine
« Reply #22 on: August 14, 2015, 08:24:51 PM »
There is an image that shows on the screen. It's hard to read, but from looking at other images online, it looks like a normal layout of five cards and a payout schedule.  None of the buttons light up, though, and pressing them doesn't seem to do anything.

I suspect that image you are seeing might be what is called "screen burn". After hours and months and years of being powered on in the casino showing basically the same thing (5 cards on screen) the phosphor coating inside the crt gets a ghost image. If the image you see is grayish and you can see it even with the machine turned off that's what it is. Any crt can have this happen when the same image is there an excessive amount of time. That's why the early computers often had software called a Screen Saver. After a certain amount time with no mouse or keyboard activity the software would put a different image on the screen, or cause it to move around to prevent the image burn from happening. Screen Savers were a popular utility program back in the day. Now Windows has that feature built-in, and with LED monitors there is not the same worry.

However, if it is a faint image you are seeing that is only there when you turn the machine on then that might be the game image, just not as bright as it should be.

If you aren't sure which it is, take a picture of the screen while the machine is turned off, try to eliminate any glare from overhead lights. Folks here will be able to say what it is.
« Last Edit: August 14, 2015, 08:40:06 PM by rokgpsman »
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Re: 1983 Double Up Cal Omega machine
« Reply #23 on: August 14, 2015, 08:43:50 PM »
There's definitely some burn in, but I do see colors when everything is powered on. I think the cards were blue and the  pay out schedule was red/yellow.

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Re: 1983 Double Up Cal Omega machine
« Reply #24 on: August 14, 2015, 08:49:31 PM »
... None of the buttons light up, though, and pressing them doesn't seem to do anything.

I don't know about your particular machine but a lot of times the button lights run off a low voltage like 7vac or  similar. And that voltage can come right off one of the power transformer secondary windings instead of from a voltage the power supply makes. I've seen it both ways. If you ohm out one of the button bulbs and it is ok that might be more indication that your power supply voltages and fuses and connectors need to be checked. If you do this also look for a number written on the bulb base, that will let us find out what voltage the button bulbs use.

The button wiring might be daisy-chained from one button to the next but it eventually makes its way to the power source. Have you had any luck tracking down any manuals or wiring diagrams?
 
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Re: 1983 Double Up Cal Omega machine
« Reply #25 on: August 14, 2015, 08:54:29 PM »
Nope, no luck tracking down manuals or schematics.

Hopefully I'll get some time this weekend to test out some of your suggestions. I really appreciate the input.

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Re: 1983 Double Up Cal Omega machine
« Reply #26 on: August 14, 2015, 08:55:38 PM »
There's definitely some burn in, but I do see colors when everything is powered on. I think the cards were blue and the  pay out schedule was red/yellow.
I'd think that color you are seeing is a good indication, seems like it would mean that video signals are getting sent to the crt from the mpu. With the machine powered up is the screen image bright enough to take a photo and show anything?
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Re: 1983 Double Up Cal Omega machine
« Reply #27 on: August 14, 2015, 08:58:44 PM »
Nope, no luck tracking down manuals or schematics.
Hopefully I'll get some time this weekend to test out some of your suggestions. I really appreciate the input.

I think I saw a Cal Omega manual for sale on a website while I was searching for a different manual. Not even sure if it is for your model though. Others have said there was a variety to how the Cal Omega machines were built, but maybe the basics like power supply, coin handling, button switches & lamps were similar enough that any manual would be helpful.

You can also read thru all the threads here on NLG in the CEI area. Also, you might not be aware that there is what is called "the old site" for NLG, it has a ton of info that is archived and available to read. The link to it is on the NLG home page, I've included it below along with a couple of the CEI forums there:

http://newlifegames.net/nlg/

http://newlifegames.net/nlg/index.php?board=45.0

http://newlifegames.net/nlg/index.php?board=47.0
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Re: 1983 Double Up Cal Omega machine
« Reply #28 on: August 14, 2015, 09:00:23 PM »
Yeah, it's bright enough, I just don't have a good picture of it yet. I think I'm going to try to assemble everything on my work table and get it powered up there. I'll try to take a picture of it then.

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Re: 1983 Double Up Cal Omega machine
« Reply #29 on: August 14, 2015, 09:06:25 PM »
Yeah, it's bright enough, I just don't have a good picture of it yet. I think I'm going to try to assemble everything on my work table and get it powered up there. I'll try to take a picture of it then.

Hey, that means things are somewhat running, right? A lot of times the screen burn looks awful with the machine off but when turned on it is not nearly as noticeable. A lot of people's machines have some screen burn. Afterall, some of the screens are over 25 years old.

If you can get the buttons to work so you can make selections then you'd be on your way to getting it working. Any sounds from the speaker?
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Re: 1983 Double Up Cal Omega machine
« Reply #30 on: August 14, 2015, 09:16:30 PM »
Nope, no sound.

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Re: 1983 Double Up Cal Omega machine
« Reply #31 on: August 14, 2015, 09:19:46 PM »
Here's a place that sells copies of CEI/Cal Omega manuals. I can't vouch for them, never bought anything there. Prices seem somewhat high for a digital download copy of the manual, no hardcopy printout is sent to you. But I guess that's the way it is sometimes with hard to find manuals.

http://www.coinslots.com/manuals/cei/


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http://www.ebay.com/itm/321830920394?item=321830920394&rmvSB=true
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Re: 1983 Double Up Cal Omega machine
« Reply #32 on: August 14, 2015, 09:33:42 PM »
Coinslots is a good company. I've bought from them without a problem. More then Limey you have the version 24.0.. I believe that's one of the earliest. It's sounding like you could have a chassis problem. Could be why your not getting a picture. That part on your back plane looks like a bridge rectifier.
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Re: 1983 Double Up Cal Omega machine
« Reply #33 on: August 14, 2015, 09:42:00 PM »
I fix a CEI last year. Here's the like to the thread. At the end are some hand drawings of the wiring. I didn't draw them but it was nice of the person that did n maybe you can find them helpful.

Gary

http://newlifegames.com/nlg/index.php?topic=2562.0
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Re: 1983 Double Up Cal Omega machine
« Reply #34 on: August 14, 2015, 10:17:46 PM »
Well, since I couldn't get to sleep, I put everything back in the cabinet and powered it on.  The good news is it seems to work as well as it did before. The bad news is it seems to work as well as it did before... :)  Part of me was hoping that by reseating almost everything, it would magically work now.  But, at least I haven't broken anything new.

Here's the best picture I could get of the CRT powered on.

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Re: 1983 Double Up Cal Omega machine
« Reply #35 on: August 15, 2015, 03:47:59 PM »
Can you carefully access your contrast and brightness controls in the monitor? Sometimes the potentiometers just get dirty, and a few turns will get your picture back stronger.
Consider becoming a regular contributing member, which helps pay costs to keep this site up and running so you can keep your machine up and running :)

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Re: 1983 Double Up Cal Omega machine
« Reply #36 on: August 15, 2015, 03:52:45 PM »
   4 voltages have to be present for the game to work, regulated 5 volts, regulated 12 volts (for 905 board measure at ground and left side R74), unregulated 12 volts (measure across C3), and 15VAC (measure across MOV CR25).  Confirm that R56 is full clockwise.  If all 5 things are good your board is bad.  Coinslots manuals are fine but probably don't have what you are looking for like schematics, wiring, or parts info 

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Re: 1983 Double Up Cal Omega machine
« Reply #37 on: August 16, 2015, 06:46:43 AM »
   4 voltages have to be present for the game to work, regulated 5 volts, regulated 12 volts (for 905 board measure at ground and left side R74), unregulated 12 volts (measure across C3), and 15VAC (measure across MOV CR25).  Confirm that R56 is full clockwise.  If all 5 things are good your board is bad.  Coinslots manuals are fine but probably don't have what you are looking for like schematics, wiring, or parts info

These are references on the game board, correct? Not the motherboard?

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Re: 1983 Double Up Cal Omega machine
« Reply #38 on: August 16, 2015, 09:06:04 AM »
   4 voltages have to be present for the game to work, regulated 5 volts, regulated 12 volts (for 905 board measure at ground and left side R74), unregulated 12 volts (measure across C3), and 15VAC (measure across MOV CR25).  Confirm that R56 is full clockwise.  If all 5 things are good your board is bad.  Coinslots manuals are fine but probably don't have what you are looking for like schematics, wiring, or parts info

dormi.. Nice to see you back on NLG.. Dormi is talking about the main board or MPU.. You won't run into else here that knows more about the CEI machines then dormi.
Please remember to make a donation to NLG for mine/our help in repairing your machines problem.. Your donations help keep this site on line.
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Re: 1983 Double Up Cal Omega machine
« Reply #39 on: August 16, 2015, 01:09:13 PM »
Can you carefully access your contrast and brightness controls in the monitor? Sometimes the potentiometers just get dirty, and a few turns will get your picture back stronger.

I pulled the monitor out to look for the brightness and contrast adjustments, but was unable to find them. There are three sets of knobs to fiddle with.  The set of two that are pretty stout are labeled Focus and Screen. The set of three at the back of the tube are labeled R, G, B from bottom to top. The set of two on the other side at the back of the tube are labeled R and G from bottom to top.  I fiddled with all of them, turning them from side to side and tried to get them back to their original position.  When I turned everything back on, the words seemed a little clearer, but everything was still pretty washed out.  Did I just miss the brightness and contrast knobs?

 

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