hello please I have error fatal head 1a39, BUT I don't have any yellow ink in head

[thesignworks]

IF there is no ink in the head on 2 channels
will it 1a39

thanks

checked ribbon seating.....

ribbons covered in ink though?

also the head in th s30600 was from a 4900, make any difernce

canntemto pullyellow uprom th cart, d thy h sub tan valves

 

[thesignworks]

also

on a 30670 where is the main board
where is the fuse


p.s. the headboltare2 or 2.5 ???

th ar not th comon 3mm