psx controllers not working - 7502 series motherboard diagram /pic required please

[davebev]

thanks for message, i've been there but cant find the info i require. i need to find a full layout pic of the motherboard with the fuses shown and identified, or even any of that nfo via several sites. i get an error message 'insert controller into port 1' and am assuming it is a fuse -UNLESS you know different and can help

thanks