NEED HELP NO B/Y/M/C WAS WORKING FINE ? ONLY LIGHT C/M

[Techno Print]

 

[Solventinkjet]

Without a model number it's hard to tell but judging by the platen that is an old 6 head machine. My guess would be blown fuses on the head board because each fuse controls 2 heads. So in this case two might have blown which is why 4 heads dropped.