Sega Naomi 2: No Sound output on right (red)

PCB problems and fixes
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usch
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Sega Naomi 2: No Sound output on right (red)

Post by usch »

Hi,

i would like to wire my naomi 2 for stereo into my sega new astro city.
So i got myself an external amp and wired everything according to this guide:
https://www.arcade-projects.com/threads ... -city.454/

I double checked that everything is wired correctly.

Unfortunately the naomi does not output any sound over the red cinch connector.
I tried to swap the wires and can confirm that the speakers are wired correctly.

Is it possible that i have to configure anything on the naomi 2 to enable the red output?

I guess that itś an hardware issue of my naomi 2 board?

Any help would be highly appreciated. =)
Sbdesign
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Re: Sega Naomi 2: No Sound output on right (red)

Post by Sbdesign »

Are you only checking the L/R outputs on the 1 amp?

If so, do you know the amp is good?

Try putting the red plug in the white one on the naomi, if that works, then the amp is fine, and speakers on your red phono.
Also try the white in the red, does the opposite speaker now not work?
If so this confirms the red output on the naomi is the issue.
usch
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Re: Sega Naomi 2: No Sound output on right (red)

Post by usch »

Thanks for your advice :)

I already tried every possible Combination.

I can confirm that i get No Sound when i Plug the White connector Into the Red Socket. I get Sound from the White socket when inolugins the Red or White connector.

I am Sure that there is an issue with the Red Socket. I already Opened the Naomi to See If anything Looks suspicious on the Board. But i could Not find anything...

Is this a known issue for old Naomi Boards?
Did anyone have the Same Problem?

Any Help would bei highly appreciated.
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toastbot
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Re: Sega Naomi 2: No Sound output on right (red)

Post by toastbot »

I'm having a similar issue with my Naomi (New Net City), except with the left (white).

I verified that the NAOMI is outputting stereo by hooking up headphones to the L/R RCA outputs on the back of it with an adapter.

I traced the problem to the sound amp, and then to the speaker outputs. The left and right channel signals are going into the amp, but I'm only getting right (red) out. I *think* the culprit might be one of the capacitors on the amp's PCB that was marked by a previous owner, but I need to get my other games back together before I start taking this one apart. :shifty:

I'm not familiar with the NAC or what kind of amp it uses, but it seems like the amp is a more common point of failure for these cabinets in general.

Good luck!
usch
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Re: Sega Naomi 2: No Sound output on right (red)

Post by usch »

Your Problem is different than mine. I can confirm that i get No Output from the Red Connection of i attach it to an AMP or Headphones. It seems Like my Naomi is broken...
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