GRAPHTEC SignJet JS310 Series Setup Manual page 38

(4) Attach one of the printhead clamps provided to fasten the tubes.
(5) Loosen the top and left screws, and remove the right screw.
(6) Mount the printhead, and then replace the right screw.
(7) Tighten the top, left and right screws to fasten the printhead in place.
SignJet JS310 Series Set Up Guide
Printhead
Loosen
Loosen
Remove
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Printhead(Top View)
Printhead clamp
Printhead clamp
Check the orientation.
(The longer dimension is
the horizontal direction.)