Ink Draining back on Cyan Lines

[heyskull]

My old Mutoh 1604 has a problem.
The Cyan ink lines drain back and have air in them when I caome in on a morning.
Am I correct in assuming this is a damper problem and need replaced with the O rings?
Or is this the internals of the head creating the problem?
I am hoping to buy a new one in the New Year so just hoping to nurse this one till February!
I wanted a 1604X to replace it with but Mutoh have discontinued it.

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[Umca]

Normally if the damper is detached from printhead and all pipe connections and damper in good condition ink will not go back.
So, it is pipe connections (O-ring) or damper proplem.

 

[heyskull]

Brilliant I have spares so can replace O rings.
The last technician I had to it reckoned only ever replace the dampers if they were failing.
I hate touching this part of the print head as damaging it can render me completley out of action.

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[Umca]

Actually, you have to cut edge of plastic pipe. Under old O-ring. And locate new ring on undamaged place. Because the ring made a jam of pipe and air can leak easily on that place.