Sega-Naomi

I have a problem with my naomi cabinet.

After a few minutes the image grows up. This happens after 5 minutes and occurs in 4 directions. After some time, the image stops growing.

Despite my attempts to settings, I can not reduce the image size. It seems that the beam sweeps far too broadly.



Have an idea for you or is the problem?

No one knows, no clue ?

According what I read, this is a quite frequent problem with sanwa 23E31S (We are two in Paris with exactely the same problem, an expanded image and a distortion in geometry).

Perhaps an mistaken component or a bad solder ?? what do you think ?

i think the b+ is unstable or the flyback is a problem

Hello gantspain,



What to you mean by b+ ?

Moved to "Technical"

voltage pot

ah think i know the problem,i would look at the east/west correction diode circuit-i think its D401 and two other nearby(HER104) but can't make out the component number on my schems

Thanks a lot grantspain and footix for your replies.

I have manual service for 29E31S chassis. According to you I have to change components D401, D407, D410, D425, D426, D813, D814, D815.

It's ok ?

I try to read schema at the end of the manual. But resolution is too bad so it's very hard to read.

If somebody have this document in high resolution, it will be very nice if he could send it me .

Grantspain, I have an ms9 chassis with other problem. After somes minutes, suddenly the picture become an line in the middle of screen and the chassis switch off itself. After one minute I heard a sound like bizzzz.

Have you an idea ?

Thanks Grantspain, i'm the second one with this problem !



Any other method for "repairing" this without remplacing components ?

I'm not good with that ...