Taito G-net coin error

[darkcrono]

Hi guise,

i recently bought a taito G-net with a super puzzle bobble card, but whenever i try to boot it, after the loading bar completing itself, it says coin switch error and reboots.

when i go to the test menu, i see that coin A is always on, i tried 3 different cabs, and disconnecting the coin mech switch, with no luck,

Any ideas of what could be going on?

Thanks!

[DaveyD]

Could be a short, or one of the chips responsible for inputs has failed?

I have a similar issue on a different game pcb where player 2 button 1 is always on. This only causes an issue for me with 2 player games, but some games don't like powering up with the coin up switch on, the gnet being one of them, so until you can fix that input, the game won't start

[darkcrono]

I follow traces from pin 16, but si get lost in a resistor Network

[nem]

@ShootTheCore posted a repair log the other day for a G-Net with coin error on Arcade-Projects

https://www.arcade-projects.com/threads ... ror.20299/

[darkcrono]

thanks a lot!! i'll take a look ASAP

[darkcrono]

So i finally got the 74ls53 and the time to swap it and it worked!

thanks @nem for the link and thanks @ShootTheCore for the info!