Help with Sega jvs type 1

[jkl]

Hi I can't figure out my problem...
I have 2x sega jvs type 1 i/o.
Both turn on, are recognized by naomi board that reads fw version and other data, but I can't get any key to work even in input test.
Wired a db15 port following ags pinout (joystick leds are turning on too)...
Powered with 5v AND 12v, even if I guess that without lamp out 12v are useless.
Used 2 different usb cables.
Same Naomi work flawlessy with jvs 2 jamma.

[jkl]

SOLVED. 

Just for future reference: a ninja-guy called Mitsurugi-w, who have is own arcade forum (don't know if I can publish the link here), gave me the solution: pins 1 and 3 of 60-pin digital connector need to be shorted.
After this all of the inputs become fully functional.
If they aren't linked no one of the 60 pins is detected.