Sega Naomi Psu?

So I've been doing some research @ Sega-Naomi.com about the Naomi1\Gd Rom\Capcom IO System requiring a extra sega psu to power the gd rom. Some websites I researched said that they did not need the extra psu for the naomi1, and some other places are saying that they did need the extra psu to power the gd rom portion of the system. Now I heard that the Naomi 2 on the other hand may not need the Extra Psu.


Now I wanted to set this up on my sigma av7000 supergun and try to avoid putting this in my astro. So.......

1. Will this work on my sigma without the extra psu?

2. Should I avoid getting the Naomi1 and get a Naomi2 instead without the psu?

3. Will the Naomi2 work without the extra psu on my sigma?

4. Should I just stop being a little bitch and get the psu?

I'm also trying to avoid as much clutter as possible.

I'm not speaking from experience but apparently a 15A arcade psu isnt powerful enough to power the gd rom setup. A lot of people use PC psu's which is actually what Sega did themselves.

I suggest you try to find out how much current is actually needed. Maybe one of the higher powered Happ units with adjustable 5v would do the job.

This is the info I found @ Sega-Naomi.com

The Naomi needs the following voltages: +3.3, +5, +12. The standard Jamma cab power supply doesnt have the 3.3v. There are 2 ways to get the required voltage. The first option is to get the Capcom I/O. The Capcom I/O adaptor outputs a 3.3v line strong enough for the Naomi system. If you are using a GD rom unit on a Naomi 1 motherboard, you will need the Sega power supply to provide power for the Gd Rom drive.

So what do I need and how would I rig it 2 the gd rom?

The Capcom I/O isn't strong enough to power the NAOMI 2 properly.

So I need the extra psu regardless. So you need 2 psu's to run the Sega Naomi w/ gd rom. That sucks balls. All that shit to run a dreamcast, lol.

The best solution would probably be to get an arcade psu with 3.3v, 5v and 12v, and simply invert the 5v to get your -5v.

Hewitson said:

The best solution would probably be to get an arcade psu with 3.3v, 5v and 12v, and simply invert the 5v to get your -5v.

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I have no clue what you just said.

Invert - Tip the waveform upside down so instead of the 5v being 5v above ground, its 5v below ground.

Something like this IC would be suitable: http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1039,C1797,P1160

NONONONO!

There's a power splitter you can get to power the GD-ROM off the same power supply. Holler at the folks over on the sega-naomi.com forums.

Will do. Thanks

Too much confusion comes with naomi hardware.. Its the reason I havent got one.

What complicates everything is the gd rom. They should have made a all in one unit with gdrom and psu built in.

Get Ready cause this is going to be alot of reading. I just got my bundle in the mail today that I bought off someone. The Bundle includes Naomi1 board, Gd Rom, Capcom IO, IO Power cable, Gd Rom Power Splitter Cable, VGA Cable, Audio Cables, Gd Rom to Dimm Cable.

1. Hooked up the IO to supergun via jamma harness.

2.Hooked up the power extension from IO to Power splitter extension to Naomi1.

3. Vga from IO to Naomi 1

4. Audio from IO to Naomi

5. Gd rom Cable to Dimm

Turned on and got No Video Or Sound, although I could hear the Naomi Fan which is pretty loud I got nothing. I disconnected everything and hooked up everything except the gd rom and power splitter. I ran the power cable this time directly from the Naomi 1 to the Io to bypass the gd rom and still when I turned it on, no audio or video. So I went and got my pc Lcd and bypassed the IO and hooked up directly from the vga on the naomi 1 to the monitor because maybe I though I had a bad IO and still nothing.

So now I'm thinking that maybe its my supergun that does not have enough juice to power the naomi sufficiently so I took the whole setup over to my apartment to try just the naomi1 and IO on my astro city and got the same thing, No video or audio. Although the IO does power the Naomi 1 I get nothing. I tried different audio and vga cables and still nothing. I'm freakin pissed right now. So now I'm hoping its the Naomi1 board that is bad because there easy and cheap to find, but I'm hoping its not the IO that went bad.

Do you guys think the Naomi1 Board is bad or could it be something else? I know I hooked everything up correctly. I mean It looks like common sense. I understand to run the gd rom I might need that extra psu, but I bypassed the gdrom and just hooked up the Naomi 1 and Io to both my supergun and astro city. One or the other had to work.

Have you checked that the motherboard is outputting in 31k?

Push dip #1 to switch between 15/31k.

I don't actually own a NAOMI so that was just a wild guess since I presume VGA requires a 31k signal.

It certainly does, he does say he has no sound as well but that doesn't mean no video is being output.

black_wizardd said:

Have you checked that the motherboard is outputting in 31k?

Push dip #1 to switch between 15/31k.

I don't actually own a NAOMI so that was just a wild guess since I presume VGA requires a 31k signal.

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Yes, I tried that also. I switched off and on and still I'm getting the same thing. Even if I'm not getting any video, I should still hear the sample sound in the naomi splash screen.

Do you have a cart to try? GD rom power cable in upside down? (<--not something you want to just play with, but something you can check)

OK,

Take the DIMM board off and only have the NAOMI board hooked to the Capcom I/O. Check the power outputs from the Capcom I/O with a multimeter to ensure the 5v and 3.3v supplies are being output properly.

DO NOT TURN THE 5v LINE UP BEYOND 5.1v TO THE NAOMI SYSTEM.

5.2v is suspected of toasting buffer chips on the NAOMI system and/or carts.

If you have proper voltage, unplug the VGA cable from the NAOMI board, set the DIP switch to have it output 31KHz, and plug in a VGA computer monitor to check it. If it still isn't working then you may have a bad game unit.

If you don't have proper voltage levels coming out of the I/O unit then your power supply is insufficient or the I/O isn't working properly.

RJ

NGT said:

Do you have a cart to try? GD rom power cable in upside down? (<--not something you want to just play with, but something you can check)

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I bypassed the gd rom all together. Just the naomi hooked up, and still no video or sound.

channelmaniac said:

OK,

Take the DIMM board off and only have the NAOMI board hooked to the Capcom I/O. Check the power outputs from the Capcom I/O with a multimeter to ensure the 5v and 3.3v supplies are being output properly.

DO NOT TURN THE 5v LINE UP BEYOND 5.1v TO THE NAOMI SYSTEM.

5.2v is suspected of toasting buffer chips on the NAOMI system and/or carts.

If you have proper voltage, unplug the VGA cable from the NAOMI board, set the DIP switch to have it output 31KHz, and plug in a VGA computer monitor to check it. If it still isn't working then you may have a bad game unit.

If you don't have proper voltage levels coming out of the I/O unit then your power supply is insufficient or the I/O isn't working properly.

RJ

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I just have the Naomi and Io hooked up. As far as the multi meter go's, I don't have one so I can't check for voltages. I really don't understand how this could be so complicated, isn't the IO suppose to convert the voltage to 3.3v so it works on the naomi.

This is the first time I've had any problems with a Jamma Board. All my Arcade boards work fine, 4 slot Mvs, Atomiswave. This is the only board that has failed on me so far. I tried this on two different power supplies and nothing. It has to be either the board or Io. I have another board and Io coming in soon. I'm gonna give it a try when it gets here. If I see it is a voltage issue on my side and the other naomi board or Io does not work either, then I'm just gonna sell off all this naomi shit. I'm not going to go through all this frustration over a massive dreamcast.

Let me get this straight.. You plugged a board into a power supply, having no idea what the supply was outputting?

Some people really do have no idea..

Hewitson said:

Let me get this straight.. You plugged a board into a power supply, having no idea what the supply was outputting?

Some people really do have no idea..

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Your a retard dude. Why do you keep posting in my threads. You got zero knowledge. Let the guys who know what there talking about answer questions. The two different power supplies I was referring too were the power supplies from my astro city and supergun.

RAZO said:

I just have the Naomi and Io hooked up. As far as the multi meter go's, I don't have one so I can't check for voltages. I really don't understand how this could be so complicated, isn't the IO suppose to convert the voltage to 3.3v so it works on the naomi.

This is the first time I've had any problems with a Jamma Board. All my Arcade boards work fine, 4 slot Mvs, Atomiswave. This is the only board that has failed on me so far. I tried this on two different power supplies and nothing. It has to be either the board or Io. I have another board and Io coming in soon. I'm gonna give it a try when it gets here. If I see it is a voltage issue on my side and the other naomi board or Io does not work either, then I'm just gonna sell off all this naomi shit. I'm not going to go through all this frustration over a massive dreamcast.

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No really to play around with these things you should have a couple tools like a multimeter and a soldiering iron. Follow Channelmaniacs diagnostic..if that doesn't work then you prob need a new main system. They burn out a lot but I see them for $40 all the time. For whatever reason its that Capcom i/o that costs all the money. Also you'll see if your I/O is bad or not. It has an adjustable pot on it that changes the electrical output.
What about your seller? He's not being very helpfull?


I have several multimeters but my favorite one is a simple one I got for $7 at Harbour Freight. I see a similiar one all the time at Lowes for $10.

Going to have and pick up a multimeter. I hope its not the IO either. I already have another Naomi and Io on the way.

The seller said that it worked before he shipped it out, but obviously its not working. So I told him if its the Naomi board, he has to refund me the price I paid for the new naomi, if its the IO and then he'll have to cover that.

I also have a Sega Sun Psu on the way so I could power the Naomi via that and not the IO. I'm going to try everything to get this up and running.

RAZO said:

Your a retard dude. Why do you keep posting in my threads. You got zero knowledge. Let the guys who know what there talking about answer questions. The two different power supplies I was referring too were the power supplies from my astro city and supergun.

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Hahaha.. I'm a retard??

You're the one who is plugging PCB's into unknown voltages, and buying another Naomi when you don't even know if the one you already have works or not, because you're incapable of using a voltmeter, you fucking IDIOT.

I hope you send all your expensive Naomi gear up in smoke, you clueless fucking clown.

In fact better yet, I hope you have a monitor problem one day and you end up killing yourself on the EHT and doing us all a favour.