Falcon Outdoor, yellow channel gone?

[Dr^stik]

I have a Falcon Outdoor that has lost its yellow print head. Using the DX2 printheads. Have replaced the ribbons , cleaned contacts. Switched heads to confirm that it is not the print head itself. Can anyone help with some additional diagnostics. No error lights or errors on the display. I am stumped! Any ideas? Thanks in advance for any assistance.

Dr^stik

 

[Border]

clogged damper or air leak in that yellow line somewhere.

 

[Dr^stik]

Replaced the damper after the initial channel drop out. Just to be sure. New O-ring also. Pulling yellow from cart to waste tank with no bubbles. All the other heads are firing perfectly. It's got me pulling what little hair I have left out! Thanks for the suggestion.

Also had a new capping station I decided to put on to reduce other posible issues.