FAULT FINDING AND REPAIR
20509 Issue 7 Jan 2018 4-15
Replacing a Print Head
The printer should be switched off and the print head cover removed.
(1) Close the valve on the print head by turning the knob fully clockwise.
(2) Place a 500 ml beaker under the nozzle plate. A suitable beaker is
supplied in the tool kit.
(3) Carefully loosen the nozzle plate fixing screws just sufficiently for air
and ink to escape.
(4) Slowly open the print head valve by turning the knob counter-
clockwise and allow air and ink to escape into the beaker. Continue
bleeding the print head until the ink system pressure is reduced to
zero, then close the print head valve.
(5) Fully remove the nozzle plate and put carefully to one side.
(6) Retrieve the O-Ring from the manifold block and the gasket from the
print head cover.
(7) Disconnect the solenoid cables from the conduit connector(s).
(8) Disconnect the pipe from the print head valve. Use a tissue to catch
any escaping ink from the pipe.
(9) Remove the two fixing screws that hold the print head to the end
cover, then remove the print head.
(10) Fit a new print head to the end cover using the two fixing screws.
(11) Connect the pipe, attached to the print head manifold, to the valve.
(12) Connect the solenoid cables to the connector(s) as shown in the
diagram (see
page 4-14). Note that the cableform for solenoids 1 to 8
for the 16 drop print head is fitted with a black sleeve.
(13) Refit the O-Ring to the print manifold block and fit the nozzle plate.
(14) Refit the print head cover and gasket.
(15) Open the print head valve by turning the knob fully counter clockwise.
(16) Turn on the printer and bleed the print head (see page 4-8).
(17) Check the drop size. (see page 3-9)
(18) Check for leaks. The print head should now be ready for use.
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