Running Sega Naomi game with ATX power supply

coinopper

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The original power supply is bad (game ran but voltages were too high and couldn't be adjusted down) and I saw where someone makes an adapter to use ATX (PC-type) power supplies. Using the pinout online ( http://cwispy.com/wp-content/uploads/2015/07/outputs.jpg), it only requires +3.3, +5, and +12, so I wired one up directly (350w model), but the power supply shuts down with a second of turning it on. If the smaller of the 2 plugs (6-pin) to the NAOMI is unplugged, it doesn't. The only difference between the 2 plus is the 6-pin lacks the +12v. Is the ATX I have not strong enough?
 
I saw his blog (mostly before his product was available) and ran down this thread: https://forums.arcade-museum.com/showthread.php?t=351380

So, I did an ATX conversion for a sega model 3 game.

If your power supply is shutting down right away, I would guess you have a short somewhere.

I'm assuming you wired the ATX pin to turn it on, right?

To solve this, I would disconnect your harness from the power supply and the game. The "adapter" you made should stay connected to the wiring harness. Volt meter for continuity between all of your power lines and ground lines.

Feel free to post pictures of your work for us to help you review.
 
HAPP power pro is a drop in replacement for the original power supplies.

There's only 2 models on Happ's site:

https://na.suzohapp.com/products/power_supplies/

The only ones that have 3.3v are the Bluebird models (which are for slot machines). The 850w model is over $300!


I saw his blog (mostly before his product was available) and ran down this thread: https://forums.arcade-museum.com/showthread.php?t=351380

So, I did an ATX conversion for a sega model 3 game.

If your power supply is shutting down right away, I would guess you have a short somewhere.

I thought that as well (ps is shutting down to protect itself). Checked the wiring. Should be:

ATX:
+3.3 - brown and orange (I only used brown)
+5 - red and purple (I only used red)
+12 - yellow
ground - black

Sun Elec:
+3.3 - brown
+5 - yellow
+12 - red
ground - white


[/quote]I'm assuming you wired the ATX pin to turn it on, right?[/quote]

Green tied to ground.

Not sure why Sega used 3 separate connectors for power (and only use a few pins for each one).
 
There's only 2 models on Happ's site:

https://na.suzohapp.com/products/power_supplies/

The only ones that have 3.3v are the Bluebird models (which are for slot machines). The 850w model is over $300!




I thought that as well (ps is shutting down to protect itself). Checked the wiring. Should be:

ATX:
+3.3 - brown and orange (I only used brown)
+5 - red and purple (I only used red)
+12 - yellow
ground - black

Sun Elec:
+3.3 - brown
+5 - yellow
+12 - red
ground - white


Green tied to ground.

Not sure why Sega used 3 separate connectors for power (and only use a few pins for each one).

Brown doesn't sound right. It was orange on my ATX power supply.

Please post pictures of your ATX power supply.

You don't want to use the secondary voltage feeds. They may either be always on (so your computer can wake itself up or use the "smart" power button) or much lower AMP total feeds.
 
That was it, "runaway". I used the orange wires for 3.3v instead of the brown (doesn't say on the p.s. which is secondary) but I should have realized orange was primary. Btw, the ATX model is TM-350-SMPR.
 
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