Digital BW, The Print

I recently replaced one head on the Epson 7000 and flushed out another, along with new 
dampers, capping station, and ink pump.

For some reason only the light 3 inks are running through the system, down to the 
overflow pads, and using up the ink.     -     The other dark 3 channels are not going 
through the system at all when an initial fill is completed. ( twice)

Finally, when I run a nozzle print pattern nothing at all prints out, either on the right or 
left printheads.


What would cause only one side of the printer to charge the inks and not the other, and 
why can't I get any nozzle check. It could be one of these two heads is bad, but just don't 
know.

John