Domino C Series, Operation And Maintenance Manual, Page: 90 / 92

TROUBLESHOOTING
90 77091 Issue 2 November 2003
Total loss of ink to all jets can also be due to an air pump failure, which is easily
detected by the absence of pump noise and vibration from the base. Check the
mains input, that the ON/OFF switch is illuminated and that the LCD screen
shows a display. Check all the ink and air supply lines and the pressure release valve
for leaks.
Alternatively, an electronic problem in the print head may be preventing any valve
from firing. Listen for the sound of valves firing to see if this is the case. Check
the LCD screen - if there is a display, check all setup parameters (is it an incorrect
dot size value). If the parameters are satisfactory, contact Domino Service for
further advice.
Flushing the Jets
If cleaning the front face of the nozzle plate and performing a purge operation
cannot restore a partially or fully blocked jet to working order, then a particle of
dust may be trapped inside the jet. The syringe flushing method will have to be
used to remove it.
Switch off the power and remove the print head cover. With a small, flat-bladed
screwdriver, gently pry off the valve outlet tube which is connected to the suspect
jet, noting the refitting order if more than one tube is released. The valves plug
into the board and can be pulled out to make this operation slightly easier.
Connect the detached end of tubing to a
syringe (SY/1, supplied in the cleaning kit)
filled with Domino nozzle cleaning fluid.
Press the syringe plunger to force cleaning
fluid down the tubing, watching for fluid
being ejected from the jet. When the
syringe is down to a quarter full, pull the
plunger back up to withdraw fluid and any
debris back into the syringe.
Discard this spent fluid immediately and
recharge with fresh fluid, repeating the
process until satisfied that the blockage and
debris have been completely cleared from
the jet. Trim the tubing slightly before
refitting to prevent leaks from the joint.
Finally, perform a purge.
Nozzle
Ink line
removed from
valve outlet