NAOMI CAPCOM I/O coil whine

[Koolhass]

Hello everybody!

Today i decided to change my Naomi 1 fans for new ones, more silent. everything went smooth, but when i plugged everything i noticed that my capcom I/O emits a coil whine, a high pitch noise that was probably hidden by the loud noise of the old fans. My setup consists of a naomi 1, a cartridge game, a capcom I/O board and a HAS supergun feeded by a mean well psu. Someone got a similar problem? I suppose that is an electrical problem, maybe if i use and atx power supply and leave the I/O board only to use my controllers?

Thanks for your help

 

[Tyson1911]

It is normal that it sounds that way after so much use, the 3.3v regulator of the Capcom JVS must be very worn. @BladeZX gave a solution that I really liked for the Naomi 1 with Capcom JVS, it is to change that 3.3v voltage regulator for a newer one that they sell on ebay at a very cheap price. I've tested it and it works wonders on the Naomi 1

https://www.arcade-projects.com/threads/sega-naomi-2-capcom-io-power-question.10769/

 

[Derick2k]

Yup, that the way to do it

 

[Koolhass]

It is normal that it sounds that way after so much use, the 3.3v regulator of the Capcom JVS must be very worn. @BladeZX gave a solution that I really liked for the Naomi 1 with Capcom JVS, it is to change that 3.3v voltage regulator for a newer one that they sell on ebay at a very cheap price. I've tested it and it works wonders on the Naomi 1

https://www.arcade-projects.com/threads/sega-naomi-2-capcom-io-power-question.10769/

Thanks a lot! I'll kill two birds with one stone! I see in your photo that you used some sort of breadboard to wire it to the I/O?