GRAPHTEC SignJet JS310-25ES, Service Manual, Page: 101 / 141

11. Troubleshooting
94 JS310-UM-251-9370
Symptom Cause Solution
There are contact marks on the
printed results. The media shifted and touched the print
heads. If the heater temperature is too high,
reduce it.
Check whether the media has been
loaded at an angle. Make sure that the
media is loaded so that it is straight.
Perform a printhead cleaning operation
(see Section 8.5 Printing the Nozzle
Check Pattern).
The gap between the media and the
print heads was insufficient, causing the
media to touch the print heads. Raise the height of the print heads.
Perform a printhead cleaning operation
(see Section 8.5 Printing the Nozzle
Check Pattern).
The color hues of the printed
results are strange. Ink of the wrong color is being emitted
by one or more of the print heads. Check the following points:
• Whether the ink tanks contain ink
that is the same color as the color code
sticker on each tank;
• Whether the colored rings on the tubes
and the stickers on the ink tanks are
the same color;
• Whether the inlet tubes have been
connected correctly.
If an error was made with any of the
above, use cleaning solution to wash out
all the affected tanks/tubing, and then
refill the tanks with ink of the correct
color or re-feed ink through the tubes as
required.
Cleaning solution is being emitted by
one or more of the print heads. Check the 3-way valve for each ink tank.
If any of the levers is set incorrectly,
move it to the ink supply position.
Ink is not being emitted correctly. Print the nozzle check pattern to check
the nozzles (see Section 8.5 Printing the
Nozzle Check Pattern).
If there are several nozzles that are not
firing, perform a printhead cleaning
operation.
If the outlet tube caps have not been
inserted firmly, ink is drawn away from
the printhead.
Firmly insert the outlet tube caps, and
then feed the ink to the printhead.