mutoh 1614 yellow problem.

[Petor]

Hi,
we have a problem with yellow color.
start to print and about 5 cm lost yellow.
i replaced dampers, printhead, i checked color tube and ink flow but nothing.
now i am thinking at transistor on the main board.
is it possible?
i am going crazy.

 

[guitarguy69]

Did you replace the damper line O-ring when the damper was replaced?
Also, sometimes the tube that connects the dampers to the print head can be bad.
Look for air in the line just prior to the damper after the printer has been idle for a while.

 

[Petor]

i swapped

the two damper yellow with two damper cyan and the problem with the respective color just to know if there are problem in color line and the problem remain in that position of printhead (now in cyan)
for this i changed printhead and flat cable.
still same problem the 2 lines of yellow (just to clear undestand 5th and 6th position of printhead)
some time it start to print direct without yellow.
i can see the dumpers tighten during cleaning that indicate the correct flow of ink but doesent print.
can be the final transistor on main board?
it was happen to someone?

 

[Petor]

and

what is a couple of transistor of yellow?
i can see 4 couples of transistor but i dont know everyone witch color is.