Naomi universal coin meter

[twon]

Hey All,

I have recently purchased a Sega Naomi universal that was completely stripped of all original electrical wiring. I am attempting to rewire it and make it closer to the Japanese style candy cabinet. My question is i don't know the correct way to wire up the coin meter to get it to work using a Japanese coin mech. The Naomi universal was originally wired for using a coin pcb and validator. My wiring harness that connects to the Sega i/o board has the +5v and coin meter wired together with the 100 ohm resistor as a way of spoofing the coin meter. My thought was to remove the 2 jumper wires that are spoofing the coin meter, run a +12v line to the coin meter directly, and splice into the coin chute micro switch and send that wire down to the coin meter as a signal wire. The other idea I had was to send the +12v direct to the coin meter, and then send a wire from the coin meter pin on the Sega I/O down to the coin meter ( assuming the Sega i/o will send a signal to the coin meter telling it a coin has been placed in the chute). Not sure which way is correct, so any ideas are welcome. Thank you.

 

[nem]

There's a schematic in the manual, and the manual can be found on AO:

https://wiki.arcadeotaku.com/w/Sega_New_Net_City

 

[twon]

Yes there is and I went through it. The problem is I have a Naomi universal which is set up for an electronic coin mech and validator, and a new net city is set up for a mechanical coin mech like most candy cabinets. that's why I am unsure of how to proceed.

 

[nem]

I understand that, but the schematic has everything you need.

You remove the credit board and the jumper wire that spoofs coin meter 1.

You replace the electronic coin mech with a mechanical one that has a simple microswitch.

Provided the coin meter accepts 12V (you would have to double check this), you run +12V and coin meter 1 from the IO down to the meter.

You connect the microswitch for the coin mech to the IO.

Unless you want to install a second coin meter, you will want to keep the jumper wire that spoofs coin meter 2. Some arcade games require both coin meters.

 

[twon]

Thanks for clarifying I have rewired the entire Naomi universal and just couldn’t make out that part. I’ll leave the 2nd meter spoofed. Thanks @nem appreciate you. Last piece of the puzzle.